The problem with the Cypriot waste bentonite is written into its chemistry. Bentonite owes its worldwide usefulness to smectite clay minerals, which swell dramatically when hydrated and form stable colloidal gels. Premium sodium bentonites, with more than 80 percent sodium-rich smectite, can boast specific surface areas of 600 to 800 square meters per gram, mostly hidden inside the interlayer space between clay platelets. The Polycanthos material, however, is dominated by potassium: potassium oxide reaches up to 3 percent by weight, and potassium ions lodged in the interlayer spaces bind the clay layers together far more tightly than sodium or calcium would, inhibiting the swelling on which everything else depends. The clay also carries up to 17 percent ferric iron in its octahedral layers, which is known to impair surface hydration, and its smectite content of 59 to 68 percent is diluted by 15 to 24 percent of inert, abrasive quartz and amorphous opal-CT silica.

Worse still, the mineralogy is complicated by interstratified illite/smectite layers, a mixed-layer structure in which non-expanding illite sheets are interleaved with smectite. These illite layers physically block full hydration and platelet separation, which is why conventional sodium carbonate activation, the standard industrial trick for swapping unfavorable cations for sodium, fails to deliver the rheological and filtration behavior demanded by American Petroleum Institute specifications. In a drilling well, that failure is not academic. Fluids that lose their colloidal structure at depth cannot carry rock cuttings to the surface, and at temperatures approaching 180 degrees Celsius in medium-to-high-depth wells, bentonite dispersions routinely fall out of compliance and flocculate, threatening stuck pipe and abandoned operations.

The research team, building on their earlier demonstration that the waste bentonite could be activated with sodium carbonate and strengthened with xanthan gum, cast a wide net. They screened eight polymers spanning the three major ionic classes: anionic additives including xanthan gum, carboxymethyl cellulose (CMC), polyanionic cellulose regular (PAC-R), and polyacrylamide; nonionic modifiers including guar gum, polyethylene glycol dimethyl ether, and maize starch; and cationic candidates in the form of polyacrylamide and dodecylpyridinium chloride. In total, 39 drilling fluid systems were prepared in 350-milliliter laboratory barrels, each containing 22.5 pounds of the activated waste clay, barite as a weighting agent, sodium carbonate as activator, and sodium hydroxide for pH control, with polymer doses varied systematically. A benchmark fluid made from commercial sodium bentonite from Milos, Greece, provided the yardstick.

The cationic polymers failed immediately and instructively. Their positively charged groups displace potassium ions through cation exchange, but the hydrophobic nature of their polymer backbones promotes aggregation rather than dispersion in water, producing instant phase separation instead of a stable colloid. Maize starch and polyethylene glycol were only partially effective, demanding roughly 150 grams and 70 grams per batch respectively, quantities so large they were ruled impractical. That left the anionic family and guar gum as the serious contenders, and the team subjected them to a battery of tests: rheology on a Fann Model 35A Couette viscometer fitted to both Bingham Plastic and Herschel-Bulkley models, low-pressure low-temperature filtration at 100 psi, and structural analysis by X-ray diffraction, scanning electron microscopy with energy-dispersive spectroscopy, and infrared spectroscopy.

The anionic polymers worked through a mechanism the authors describe as electrosteric stabilization. Negatively charged polymer chains adsorb onto the edges of clay platelets while their ionized carboxylate groups extend into the water, generating electrostatic and steric repulsion that prevents aggregation and builds the colloidal network. But the efficiency of this process turned out to be governed by the illite/smectite transformation itself. X-ray diffraction revealed peak splitting characteristic of interstratified clays, and energy-dispersive analysis of the silicon-to-aluminum ratio showed that PAC-R induced the strongest beidellite formation, with the broadest ratio at 6.214 and the lowest calcium and magnesium concentrations. Beidellite, with its highly negative tetrahedral charge, creates expanded clay frameworks that demand more polymer to bridge, which is why PAC-R required the largest dose to meet the API shear-stress threshold of 15.31 pascals at maximum shear rate.

CMC emerged as the quiet champion. Its linear conformation, high degree of dissociation, and the comparatively weak illite/smectite transformation in its systems allowed it to satisfy API rheology and filtration standards with the lowest polymer input of any additive tested. Its 10-second gel strengths ranged from 0.5 to 4 pascals and its 10-minute gel strengths from 0.75 to 11.5 pascals, both comfortably inside the operationally safe window of roughly 4.8 to 14.3 pascals, strong enough to suspend cuttings when circulation stops but weak enough to restart flow without fracturing the formation. Its filter cake was exceptionally tight, with a permeability of about 0.39 millidarcy and a filtrate loss of just 7.2 milliliters, well under the 15-milliliter API limit. PAC-R produced the densest cake of all at 0.14 millidarcy, while xanthan gum’s branched structure left a more porous cake and slightly higher fluid losses at low doses.

The decisive test came with heat. The optimized fluids were cycled from 40 to 90 degrees Celsius using a roller oven and thermostatically controlled viscometer cup, simulating the thermal conditions of upper well sections. Plastic viscosity declined with temperature in every system, as thermal energy accelerates deprotonation of clay surfaces and polymer chains, disrupting gel structures. PAC-R collapsed entirely, losing colloidal function at elevated temperatures. Guar gum, whose weak glycosidic bonds are prone to thermal scission and oxidative degradation, faded as temperatures climbed, though a modest dose increase could make it viable. Xanthan gum retained API compliance across most of the range, but CMC kept the strongest colloidal network of all, holding its rheological parameters above the compliance threshold up to 90 degrees Celsius and maintaining robust yield points throughout. When compared against both the Milos commercial bentonite and published data on Wyoming sodium bentonite, the CMC- and xanthan-amended composites performed adequately, validating the transformation of a problematic waste into a genuine drilling fluid component.

The economics seal the argument. A laboratory-scale formulation of the CMC system costs an estimated 0.81 euros per unit, with the xanthan version at 0.88 euros, and the clay itself is essentially free, sitting in stockpiles at the quarry while the quarry’s water-recycling system reuses the distilled water. Those figures are preliminary, technology-readiness-level-four estimates that bulk procurement should only improve, but the strategic logic is compelling: converting a low-value waste stream into a high-performance material reduces reliance on imported bentonite at a time of rising European prices, minimizes landfilling, and aligns squarely with the circular-economy principles of the European Commission’s Green Deal. The authors suggest next steps including dynamic thermal-aging tests, formulation with field waters such as seawater, and Raman spectroscopy to probe clay-polymer interactions at the molecular level. For now, the message is strikingly simple: the answer to one of drilling engineering’s nagging supply problems may have been sitting in a Cypriot waste heap all along, waiting for the right polymer to unlock it.

Subject of Research: Polymer modification of potassium-rich waste bentonite for thermally stable water-based drilling fluids

Article Title: Environmentally friendly polymer-modified K + -rich waste bentonite composites for achieving colloidal and thermal stability in water-based drilling fluids

Article References: Ramsis, Y., Sarris, E.-N., Papadopoulou, L., & Kantiranis, N. (2026). Environmentally friendly polymer-modified K+-rich waste bentonite composites for achieving colloidal and thermal stability in water-based drilling fluids. Case Studies in Chemical and Environmental Engineering, 14, Article 101497. https://doi.org/10.1016/j.cscee.2026.101497

Image Credits: AI Generated

DOI: 10.1016/j.cscee.2026.101497

Keywords: bentonite, drilling fluids, polymers, carboxymethyl cellulose, xanthan gum, rheology, thermal stability, circular economy, Cyprus, clay minerals, Eastern Mediterranean gas, API standards

The choice of plant was no accident. Millettia ferruginea is a member of the legume family found across Ethiopia, Kenya, and Tanzania, where its seeds serve as a natural purgative and deworming agent, its leaves are used against inflammation and malaria, and its bark and roots feature in remedies for fever and infections. The tree is also an ecological workhorse: fast-growing and hardy, it anchors reforestation and agroforestry programs, combats soil erosion, improves soil fertility, and provides shade and habitat for wildlife. Its durable timber supports furniture-making and construction, and its seeds yield oil used in medicine and cosmetics. Crucially for the chemists, its leaves are rich in phenolic and flavonoid compounds, molecules whose hydroxyl, carbonyl, and carboxyl groups can grab onto metal ions and coat growing crystal surfaces.

That chemistry is exactly what green nanomaterial synthesis requires. The team used a hydrothermal method, in which reactions run in water inside a sealed, Teflon-lined stainless-steel autoclave at elevated temperature and pressure. Dissolved zinc nitrate was mixed with filtered leaf extract and treated bentonite clay, the pH was adjusted to 6.5, and the mixture was heated for three hours at 125 to 138 degrees Celsius under autogenous pressure of about 9.87 atmospheres. After cooling, filtration, centrifugation, washing, and drying at 325 degrees Celsius, the result was a powder in which zinc oxide had formed in the presence of the clay and the plant’s phytochemicals.

An important subtlety lies in what the plant extract actually does. Unlike silver or gold nanoparticles, where plant chemicals reduce metal ions to metal atoms, zinc ions are not reduced by phytochemicals; the standard reduction potential of the zinc couple is far too negative. Instead, zinc oxide forms through hydrolysis of zinc ions to zinc hydroxide followed by dehydration into ZnO. The researchers therefore assign the extract a different role: its phenolics, flavonoids, tannins, coumarins, and alkaloid nitrogen atoms chelate zinc ions and act as capping and stabilizing agents, shaping nucleation and growth rather than supplying electrons. The team even worked out why pH 6.5 works: at the zinc concentration used, the solubility equilibrium of zinc hydroxide predicts precipitation beginning near that pH, and the hydrothermal treatment then drives further hydrolysis, dehydration, and crystallization.

Characterization confirmed the product. X-ray diffraction showed the characteristic reflections of hexagonal wurtzite zinc oxide, matching the standard reference card for that structure, alongside peaks from montmorillonite, the main mineral in bentonite. Applying the Scherrer equation to the strongest zinc oxide reflection gave a crystallite size of about 14.6 nanometers, a measure of coherently diffracting domains rather than whole particles. Infrared spectroscopy of the composite retained the clay’s silicate bands, with a small shift of the silicon-oxygen band from 1030 to 1025 wavenumbers hinting at weak surface interactions, though the authors caution that this alone cannot prove covalent bonding between the oxide and the clay. Scanning electron microscopy revealed irregular agglomerates several micrometers across, each likely containing many nanoscale crystallites, and energy-dispersive X-ray analysis detected zinc, oxygen, silicon, aluminum, and sodium, consistent with zinc oxide on an aluminosilicate support.

Before making the composite, the team profiled the leaf extract itself. Standard colorimetric screening detected alkaloids, flavonoids, tannins, phenolics, terpenoids, coumarins, glycosides, and saponins, a broad pharmacological toolkit that provides a scientific rationale for the tree’s traditional uses. Quantification by the Folin-Ciocalteu method, calibrated against gallic acid, yielded a total phenolic content corresponding to about 105 milligrams of gallic acid equivalents per liter in the assay solution, while the aluminum chloride assay gave a flavonoid level of roughly 32 milligrams of catechin equivalents per liter, and a gelatin precipitation method put tannins at about 28 milligrams of tannic acid equivalents per liter. In a DPPH radical scavenging test, the extract neutralized 56.92 percent of the stable purple radical at a single tested concentration of 21.3 parts per million, a performance comparable to ascorbic acid standards in the 30 to 40 parts per million range, whose own half-maximal inhibitory concentration was 33.8 parts per million.

The antibacterial results were the most striking. Using the agar well diffusion method against four bacterial strains, two Gram-positive and two Gram-negative, the researchers applied a fixed 20 micrograms of each material per well. Bentonite alone showed essentially no inhibition, with zones smaller than 5 millimeters. Plain zinc oxide produced zones of 12 to 17 millimeters. The composite, however, generated zones of 20.2 to 21.0 millimeters against Escherichia coli and Klebsiella pneumoniae, and, remarkably, 28.0 to 28.6 millimeters against Staphylococcus aureus and Streptococcus pyogenes. Against the Gram-positive strains, the composite even outperformed the gentamicin antibiotic control, which produced a 23.7-millimeter zone, and exceeded tetracycline, which showed no measurable inhibition under the test conditions.

Why would anchoring zinc oxide on clay boost its antibacterial punch? The authors propose that the composite’s activity stems from the intrinsic antibacterial properties of zinc oxide, potentially amplified by the clay’s large surface area and adsorption capacity, which may concentrate material at the bacterial surface. Zinc oxide nanoparticles are thought to kill bacteria partly through the generation of reactive oxygen species and physical damage to cell membranes, although the team notes these mechanisms were not directly probed in this study. The strong showing against Gram-positive bacteria is notable, since those organisms lack the outer membrane that partially shields Gram-negative species from many antimicrobial agents.

The researchers are candid about the limits of their data. The extract’s antioxidant result is preliminary, based on a single concentration, so no dose-response curve or IC50 value could be derived for the extract or the composite. The antibacterial assay used only one applied amount, so minimum inhibitory and bactericidal concentrations remain undetermined. Electron microscopy and elemental mapping could not show whether the zinc oxide sits on the clay surface, within the particles, or as a separate phase, and the available spectra cannot establish the detailed interface between the two components. Notably, some follow-up measurements, including additional X-ray diffraction, diffuse reflectance spectroscopy, BET surface area analysis, transmission electron microscopy, and X-ray photoelectron spectroscopy, could not be performed because the relevant laboratory facilities were damaged during the civil war in Ethiopia, a sobering reminder that scientific infrastructure is often among conflict’s quiet casualties.

Even with those caveats, the study stakes out a genuinely novel claim: this is, to the authors’ knowledge, the first report of a Millettia ferruginea-mediated zinc oxide/bentonite composite. Previous green syntheses used neem or tea extracts to make bare zinc oxide nanoparticles, and earlier zinc oxide-clay composites relied on conventional chemical routes without plant assistance. By combining a locally abundant bioresource with a widely used clay and a low-energy aqueous process, the work points toward antimicrobial materials that could eventually serve in environmental remediation, catalysis, or biomedical applications. The authors recommend that future studies include control syntheses without the plant extract, full dose-response and MIC/MBC testing, cytotoxicity and biocompatibility evaluation, detailed interfacial characterization, and scalability trials. For now, the humble Birbira leaf has demonstrated that traditional knowledge and modern nanotechnology can crystallize together, quite literally, into something more potent than either alone.

Subject of Research: Green synthesis of a ZnO/bentonite nanocomposite using Millettia ferruginea leaf extract and evaluation of its antioxidant and antibacterial activity

Article Title: Green synthesis and characterization of ZnO/bentonite composites using Millettia ferruginea leaf extract, determination of antioxidant and antibacterial activity

Article References: Gebrye, A. B., Gebrie, T. B., Alem, F. W., & Metto, M. (2026). Green synthesis and characterization of ZnO/bentonite composites using Millettia ferruginea leaf extract, determination of antioxidant and antibacterial activity. Current Research in Biotechnology, Article 100425. https://doi.org/10.1016/j.crbiot.2026.100425

Image Credits: AI Generated

DOI: Not provided

Keywords: green synthesis, zinc oxide nanoparticles, bentonite, Millettia ferruginea, hydrothermal synthesis, antibacterial activity, antioxidant, phytochemistry, nanocomposite, DPPH assay, Ethiopia, wurtzite ZnO

The study, published in the journal Environmental Geochemistry and Health, tackled a problem that has long concerned environmental microbiologists. When reclaimed water percolates through the vadose zone, the unsaturated layer of soil between the surface and the water table, it can ferry contaminants into rivers and aquifers. Among the most worrying of these hitchhikers are antibiotic resistance genes, or ARGs, which exist in two distinct forms. Intracellular ARGs travel inside living bacteria, while extracellular ARGs circulate as naked DNA released from dead cells. Both forms can spread resistance through the environment, and both have proven notoriously difficult to intercept simultaneously.

To test whether a bentonite seepage-control layer could do just that, the researchers built large-scale soil column simulators measuring three meters in length—an unusually realistic setup for laboratory infiltration studies. Over a 40-day experiment, they continuously fed reclaimed water through columns containing a bentonite barrier layer and compared the results against columns of native soil alone. The scale matters: smaller laboratory columns often fail to capture the hydraulic complexity of real field conditions, so the three-meter design lends the findings considerable practical weight.

The analytical toolkit was correspondingly thorough. The team combined hydraulic characterization with chemical analysis by high-performance liquid chromatography to track antibiotic concentrations, and they used quantitative real-time polymerase chain reaction to measure how many resistance genes made it through the system. To understand the ecological consequences, they sequenced the 16S rRNA gene, a standard molecular marker that reveals which microbial species are present and in what proportions. This combination allowed the researchers to quantify not just what was intercepted, but how the underground microbial community responded to the barrier’s presence.

The results were striking. The bentonite seepage-control layer enhanced the apparent attenuation of antibiotics by 48.51 percent compared with untreated soil, and it substantially reduced the migration of resistance genes through the profile. According to the authors, the barrier works through a dual mechanism: hydraulic retardation and sorptive retention. Bentonite, a swelling clay rich in montmorillonite, dramatically lowers the permeability of the layer it occupies, forcing water to move more slowly and giving physical, chemical, and biological processes more time to degrade or immobilize contaminants. At the same time, the clay’s negatively charged surfaces and layered structure provide abundant binding sites for antibiotic molecules and for DNA itself.

Independent batch adsorption experiments confirmed the sorptive side of the story. Bentonite showed a substantially higher capacity for retaining plasmid DNA—the circular DNA molecules that often carry resistance genes and can transfer them between bacteria—than the native soil did. This matters because plasmid-mediated gene transfer is one of the main routes by which resistance spreads through microbial communities, a process known as horizontal gene transfer. By binding plasmid DNA before it can reach downstream environments or encounter new bacterial hosts, the clay layer effectively cuts a key transmission pathway.

One consistent finding across both column systems was that extracellular ARGs remained the dominant fraction of the resistance gene pool throughout the experiment, a result the researchers report as statistically significant at p < 0.001. This observation aligns with a growing body of evidence that free DNA released from dead cells persists in soils and sediments far longer than once assumed, and that it can be taken up by competent bacteria in the environment. Extracellular DNA has been described in the literature as a neglected reservoir of resistance genes in aquatic systems, and its persistence in river sediments has been shown to facilitate the propagation of resistance. Any barrier technology that hopes to control the environmental spread of resistance must therefore handle the extracellular fraction, not just living bacteria—and the bentonite layer appears to do exactly that.

Crucially, the barrier achieved its interception without wreaking havoc on the underground ecosystem. The researchers found that microbial alpha-diversity, a measure of species richness and evenness within the community, was preserved in the presence of the bentonite layer, and the indigenous community structure remained stable over the course of the infiltration experiment. This is a non-trivial point. Some remediation approaches, such as chemical amendments or aggressive disinfection, can reshape microbial communities in ways that disrupt nutrient cycling or even select for hardier resistant strains. A passive barrier that filters contaminants while leaving the resident ecology essentially undisturbed represents a genuinely different kind of intervention—one that works with the soil rather than against it.

The practical implications are considerable. Bentonite is abundant, cheap, and already widely used in geotechnical engineering, most notably in geosynthetic clay liners that seal landfills and containment ponds. Adapting this off-the-shelf material for reclaimed water recharge basins, constructed wetland bottoms, or riverbank filtration systems would require no exotic chemistry and no ongoing energy input. The researchers describe the approach as robust, cost-effective, and passive—a strategy that works silently underground for years once installed. In an era when wastewater treatment plants are recognized as hotspots for the release of antibiotics and resistant bacteria, and when even very low concentrations of antibiotics in the environment can select for resistant strains, such a low-tech complement to high-tech treatment could be valuable.

Questions remain before bentonite barriers become standard practice. The study ran for 40 days, and long-term performance—including how the layer behaves through repeated wet-dry cycles, which are known to affect the swelling and hydraulic conductivity of bentonite liners—will need field-scale verification. The fate of captured antibiotics and genes after they bind to the clay, and whether saturated surfaces eventually release their cargo, also deserves attention. Still, the core message of the research is clear and timely: as reclaimed water becomes a pillar of urban water management, the ground beneath our feet can be engineered to serve as a last line of defense against one of public health’s most insidious threats. A layer of humble clay, it turns out, may be one of the simplest and most elegant tools in that fight.

Subject of Research: Bentonite seepage-control layers for intercepting antibiotics and antibiotic resistance genes during reclaimed water infiltration into soil and groundwater

Article Title: Bentonite seepage-control layers mitigate the transport of antibiotics and antibiotic resistance genes during reclaimed water infiltration

Article References: Zhang, Z., Chen, Z., Jiang, X., Han, Y., Zheng, H., Zhao, X., Xie, E., & Li, Y. (2026). Bentonite seepage-control layers mitigate the transport of antibiotics and antibiotic resistance genes during reclaimed water infiltration. Environmental Geochemistry and Health, 48(16), Article 626. https://doi.org/10.1007/s10653-026-03522-z

Image Credits: AI Generated

DOI: 10.1007/s10653-026-03522-z

Keywords: antibiotic resistance genes, bentonite, reclaimed water, groundwater recharge, extracellular DNA, water reuse, soil contamination, clay minerals, vadose zone, qPCR, microbial ecology, seepage-control layer

The core innovation lies in the chemistry of the polymers themselves. Starch is one of the most abundant natural polysaccharides on Earth, cheap and widely available, but on its own it makes a poor flocculant, the class of agents used to clump fine suspended particles together so they can be separated from water. Natural polysaccharides suffer from short shelf life and weak adsorption capability. To overcome these limitations, the researchers grafted synthetic monomers onto the starch backbone, creating hybrid molecules that combine the biodegradability of a natural polymer with the functional power of synthetic acrylamide and acrylic acid chains. Grafting, in which side chains of anionic polyacrylamide or polyacrylic acid are chemically attached to the starch skeleton, transforms a soft, soluble carbohydrate into a robust, multifunctional treatment agent.

The team prepared three distinct polymers. Two of them, designated P-1 and P-2, were anionic starch-grafted polyacrylamides synthesized by gelatinizing corn starch in deionized water at 90 degrees Celsius, cooling the mixture to 40 degrees, and then reacting it with polyacrylamide, acrylic acid and potassium persulfate initiator for five hours at 60 degrees. The only difference between the two was atmosphere: P-1 was made in open air, while P-2 was produced under a continuous flow of nitrogen gas. That seemingly minor change proved decisive. Nitrogen purging minimizes oxygen interference and prevents premature radical termination during polymerization, allowing more monomer chains to attach to the starch. The grafting ratio and grafting efficiency of P-2 reached 82 percent and 71 percent respectively, compared with 78 percent and 54 percent for its air-synthesized counterpart. A third polymer, P-3, a starch-grafted polyacrylic acid made with a ferric ammonium sulfate and hydrogen peroxide initiator system, rounded out the set.

Characterization confirmed that the grafting had genuinely taken hold. Kinematic viscosity, measured with a Redwood viscometer, rose from 1.26 centistokes for native starch to 1.88 for P-1 and 2.07 for P-2, while intrinsic viscosity climbed from 1.04 to 1.98 and 2.61 grams per deciliter, a trend consistent with the Mark-Houwink relationship linking viscosity to molecular weight. Fourier-transform infrared spectroscopy revealed new peaks in the grafted polymers at 1720 and 1570 per centimeter, corresponding to carboxylic acid and amide groups absent from pure starch, along with a carbon-nitrogen stretch at 1340 per centimeter, and the spectra of the nitrogen-synthesized polymer were noticeably smoother and more regular. Scanning electron microscopy showed that the smooth, granulated surface of native starch had become rough, porous and heterogeneous after grafting, dramatically increasing the number of active sites available for contaminant binding. Energy-dispersive X-ray spectroscopy detected nitrogen in the grafted polymers but not in the starting starch, sealing the case that the synthetic chains had been successfully anchored.

Before touching real effluent, the team ran preliminary trials on synthetic methylene blue dye solutions. There, the polymers and activated potato peel performed impressively, with P-1 and P-2 achieving 99 percent color removal and the activated peel reaching 90 percent. But when the materials were tested individually against actual tannery wastewater, collected from an industry in Lahore and characterized at the PCSIR Center for Environmental Protection Studies, none of them worked well alone. It was only in combination that the system came alive, a finding that shaped the entire optimization strategy. The researchers settled on the two anionic polyacrylamide polymers, P-1 and P-2, and designed six different treatment combinations pairing each polymer with activated potato peel, bentonite, or both.

To squeeze the maximum performance out of these combinations without running an unmanageable number of experiments, the team turned to response surface methodology, a statistical framework that maps how multiple variables jointly influence an outcome. Using a central composite design, they generated eighteen experimental runs for each of the six treatment types, 108 runs in total, varying polymer concentration, activated potato peel dose and bentonite amount while holding pH and shaking time constant. The approach captures interaction effects that single-factor experiments miss entirely, and it produces predictive mathematical models of each response. Analysis of variance confirmed the models were statistically robust: the color reduction model yielded an F-value of 29.29, the turbidity model 22.25 and the TDS model 58.84, all highly significant, with coefficients of determination around 0.97 and non-significant lack-of-fit tests indicating the models faithfully represented the data.

The three-dimensional response surfaces revealed a nuanced interplay among the variables. Color removal climbed from 47 to 80 percent as polymer concentration increased, but fell from 64 to 53 percent when the activated potato peel dose rose, and dropped from 68 to 45 percent as bentonite increased, evidence that overdosing the auxiliary adsorbents can actually destabilize flocs. Turbidity behaved differently, improving as potato peel and bentonite doses rose, while TDS reduction responded strongly to polymer concentration, rising from 68 to 88 percent, and to bentonite, which pushed TDS removal up to 78 percent. Numerical optimization using the desirability function of Design-Expert software predicted an optimum of 0.30 grams of polymer, 0.70 grams of activated potato peel and 2.50 grams of bentonite, forecasting 91.0 percent color reduction, 89.5 percent turbidity removal and 87.2 percent TDS reduction.

Validation experiments under those predicted conditions landed within five percent of the forecasts, delivering the headline figures of 90.2, 88.9 and 86.6 percent removal for color, turbidity and TDS respectively. The winning configuration paired P-2, the polymer synthesized under nitrogen, with both natural co-agents, confirming that the higher grafting efficiency achieved in an oxygen-free environment translates directly into field performance. The authors attribute the success to a synergistic removal mechanism operating on several fronts simultaneously. Hydroxyl, carboxyl and amide groups on the grafted polymer capture suspended particles, dissolved salts and colored organic pollutants through electrostatic attraction and hydrogen bonding, while the long polymer chains bridge fine colloids into large, fast-settling flocs. The activated potato peel contributes porous adsorption sites for organic contaminants and dyes, and the layered aluminosilicate structure of bentonite, with its ion-exchange capacity, strengthens coagulation and accelerates settling.

The performance sits comfortably within the range reported for the best starch-based and bio-based treatment materials in the recent literature, which typically span 80 to 99 percent contaminant removal, and the researchers note that functionalized starch materials have achieved adsorption capacities rivaling synthetic adsorbents while remaining far less toxic. Equally important is what happens after the treatment: the starch backbone renders the spent polymer biodegradable, so once saturated it can be dried and disposed of by controlled incineration or landfilling, or regenerated through desorption with acid, base or salt solutions for reuse. The study is not without limits, as the authors themselves acknowledge. It tested wastewater from a single industrial source, and the long-term stability and reusability of the polymers were not evaluated, leaving regeneration performance and pilot-scale trials as the obvious next steps. Still, the message is striking: three cheap, abundant materials, a food-industry byproduct, a common clay and a kitchen staple transformed by graft polymerization, can together strip nearly nine-tenths of the pollution load from some of the dirtiest industrial effluent, offering a template for sustainable water remediation wherever cost, not chemistry, is the barrier.

Subject of Research: Starch-grafted polymer flocculants for industrial wastewater treatment optimized by response surface methodology

Article Title: Synthesis of starch-grafted polymers for color, turbidity, and TDS reduction from industrial wastewater: optimization using response surface methodology

Article References: Synthesis of starch-grafted polymers for color, turbidity, and TDS reduction from industrial wastewater: optimization using response surface methodology. (n.d.). https://doi.org/10.1007/s44371-026-00952-7

Image Credits: AI Generated

DOI: 10.1007/s44371-026-00952-7

Keywords: starch-grafted polymers, flocculants, wastewater treatment, tannery effluent, activated potato peel, bentonite, response surface methodology, central composite design, turbidity removal, total dissolved solids, biodegradable polymers, graft polymerization

The new material, dubbed BLB for its three ingredients, is a carefully engineered blend in which each component plays a distinct structural and chemical role. Biochar, a porous carbon material produced by heating biomass in low-oxygen conditions, contributes an extensive network of pores and a large internal surface area where phosphate ions can lodge. Bentonite, a swelling clay rich in montmorillonite, brings structural stability and cation-exchange capacity, helping to anchor the composite architecture and provide additional binding sites. Laterite, a reddish tropical soil enriched with iron and aluminum oxides, supplies the chemically active surfaces that do much of the heavy lifting in phosphate capture. By combining these three materials in controlled proportions, the researchers created a synergistic system in which the active sites are exposed in a way that maximizes contact with dissolved phosphorus.

Through systematic batch experiments testing different mixing ratios, the team identified a 4:4:1 formulation of biochar, laterite, and bentonite as the optimal recipe. Under laboratory conditions with a phosphorus concentration of 10 milligrams per liter at a near-neutral pH of 6.5, this formulation achieved a removal efficiency of 76.96 percent and an experimental adsorption capacity of 19.24 milligrams of phosphorus per gram of material. While those figures may sound modest compared with some exotic engineered sorbents, the significance lies in the cost and sustainability of the ingredients: all three components are inexpensive, widely available, and free of the toxic or scarce elements that complicate the deployment of metal-modified alternatives.

To understand how the composite behaves over time, the researchers subjected their data to kinetic modeling, fitting the uptake curves to both pseudo-first-order and pseudo-second-order kinetic equations. Remarkably, both models described the experimental results with correlation coefficients exceeding 0.99, suggesting that phosphate uptake involves a combination of processes—initial rapid adsorption onto readily accessible surface sites followed by slower diffusion into the porous interior of the composite. This dual character is typical of well-designed porous adsorbents and indicates that the material continues to capture phosphorus well beyond the first moments of contact, a valuable property for real-world treatment scenarios where water residence times vary.

Equilibrium behavior was assessed through adsorption isotherms, and the Langmuir model emerged as the best description of the data, with correlation coefficients ranging from 0.9567 to 0.9948. The Langmuir framework assumes that adsorption occurs as a monolayer on a finite number of energetically equivalent sites, and fitting the isotherm data yielded a predicted maximum monolayer capacity of 48.39 milligrams of phosphorus per gram of composite at 45 degrees Celsius. The good fit to Langmuir rather than Freundlich-type behavior implies that the binding sites on the BLB composite are relatively uniform and that once they are saturated, additional phosphorus cannot be accommodated—a finding that helps define the practical loading limits of the material before regeneration or replacement is needed.

Perhaps the most scientifically valuable part of the study is the mechanistic picture that emerges from spectroscopic characterization. The evidence points to inner-sphere complexation as the dominant uptake mechanism: phosphate ions form direct chemical bonds with iron and aluminum atoms at the oxide-rich surfaces inherited from the laterite component, creating Fe–O–P and Al–O–P linkages. Unlike outer-sphere adsorption, in which ions are held only by weaker electrostatic attraction and can be easily displaced, inner-sphere complexes are robust and resistant to desorption, meaning phosphorus captured by the composite is unlikely to leak back into the water. The researchers also found that precipitation contributes to phosphate removal under selected conditions, adding a secondary pathway that reinforces the primary complexation mechanism.

Real waters are never pure solutions of phosphate, however, and the team probed how competing anions affect performance. In competitive inhibition experiments conducted at constant temperature, phosphorus concentration, and pH, the interference followed a clear order: carbonate ions interfered most strongly, followed by sulfate, then nitrate, and finally chloride, which had the least impact. This hierarchy makes chemical sense, because multivalent anions such as carbonate and sulfate carry higher charges and compete aggressively for the same iron and aluminum adsorption sites that phosphate targets. The result carries a practical warning for deployment: waters rich in carbonate alkalinity may reduce the composite’s effective capacity, and treatment designs should account for the anion chemistry of the source water.

The broader context of this work is a growing global effort to control phosphorus pollution while avoiding the pitfalls of first-generation remediation materials. Many high-performance adsorbents reported in recent years rely on lanthanum, iron salts, aluminum compounds, or other metal modifications grafted onto biochars, zeolites, or hydrogels. These materials can achieve remarkable capacities, but they raise concerns about cost, the environmental footprint of mining and processing rare or heavy metals, and the fate of the loaded sorbent after use. By demonstrating that effective phosphorus adsorption is achievable through modification with nothing more exotic than biochar, laterite, and bentonite, the Chengdu team provides a proof of concept that nature’s own chemistry—iron and aluminum oxides forged in tropical weathering, layered clays, and porous carbon—can be harnessed directly.

The implications extend beyond laboratory beakers. Because laterite and bentonite are abundant in many tropical and subtropical regions where eutrophication pressure is acute, and because biochar can be produced from agricultural and forestry residues, the composite could in principle be manufactured close to where it is needed, minimizing transport costs and supporting circular-economy approaches. The study was supported by the National Natural Science Foundation of China, the State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, and the Sichuan Science and Technology Education Joint Fund, reflecting institutional commitment to developing soil- and water-remediation technologies grounded in local geology.

Challenges remain before BLB composites see field deployment. The researchers note that performance was characterized under controlled batch conditions, and real treatment systems will demand evaluation in continuous-flow configurations, with variable pH, organic matter, and mixed pollutant loads. Questions about regeneration, disposal of phosphorus-laden material, and long-term leaching behavior will also need answers. Yet the core message of the study stands: by intelligently combining three humble natural materials and controlling how their active sites are exposed, it is possible to engineer an adsorbent that rivals metal-modified systems in function while sidestepping their costs and hazards. As algal blooms intensify under warming climates and expanding agriculture, such accessible, mechanistically understood, and sustainable materials may prove to be exactly the tools that watershed managers have been waiting for.

Subject of Research: Phosphorus removal from water using a biochar-laterite-bentonite composite adsorbent

Article Title: Natural material-modified absorbent for phosphorus removal from waters

Article References: Nkhata, D., Zhang, W., Osei, S., You, W., & Ambele, D. D. (2026). Natural material-modified absorbent for phosphorus removal from waters. Environmental Geochemistry and Health, 48(14), Article 583. https://doi.org/10.1007/s10653-026-03465-5

Image Credits: AI Generated

DOI: 10.1007/s10653-026-03465-5

Keywords: phosphorus removal, biochar, laterite, bentonite, adsorption, eutrophication, water treatment, iron-aluminum oxides, Langmuir isotherm, inner-sphere complexation, pollution remediation, sustainable materials

The heart of their concept, published in Energy Reports, is deceptively simple: a tubular evaporation module made from a composite of calcium alginate and bentonite clay, designed to hang on a building façade and convert locally generated greywater into distilled freshwater using nothing more exotic than low-grade heat from the sun. Greywater—the relatively clean wastewater from showers, washbasins, laundry, and kitchens—makes up between 50 and 80 percent of household wastewater, with daily production ranging from about 65 liters per person in low-income countries to around 130 liters per person in high-income countries. Because greywater carries lower and more stable loads of organics, solids, nutrients, and pathogens than mixed sewage, it is an ideal feedwater for decentralized recovery exactly where it is produced.

What makes the material choice clever is the marriage of two humble substances with complementary weaknesses. Bentonite, a swelling clay whose main constituent montmorillonite is a layered aluminosilicate, is prized in water treatment for its high water adsorption capacity and ion-exchange behavior, and it can adsorb contaminants ranging from heavy metals to dyes. On its own, however, bentonite progressively disintegrates during prolonged contact with water, and conventional ceramic firing, which would fix that problem, destroys the open porosity that makes the clay useful for water transport. Sodium alginate, a cheap, abundant, and non-toxic biopolymer, solves this through ionotropic gelation: when shaped composite samples are soaked in a calcium chloride solution, sodium ions in the alginate exchange with calcium ions, knitting a mechanically stable hydrogel network that locks the bentonite particles and lamellas in place while leaving the clay’s layered microstructure intact—something scanning electron microscopy of extruded tube cross-sections confirmed directly.

The researchers formulated two compositions. The first, richer in bentonite at 45 percent by weight with 5 percent sodium alginate and 50 percent water, maximized transport properties. The second, with 29 percent bentonite and a denser 13 percent alginate fraction in 58 percent water, traded some evaporation performance for mechanical robustness. Both mixtures were refined on a two-roll mill, shaped by ram extrusion through a die with 16 millimeter external and 10 millimeter internal diameter, and crosslinked for at least 12 hours in the calcium chloride bath. The two batches responded differently to crosslinking: the first composition produced tubes with final external and internal diameters of 15 and 8.5 millimeters, while the second shrank to 8 and 6.5 millimeters—shrinking, in effect, into a finer geometry that packs more evaporation surface into the same panel area.

Before any tube was wetted, the bulk material had to prove it could survive the wet-dry cycling that façade life demands. Spherical samples roughly 4.8 millimeters in diameter were exposed to controlled humidity of 75 and 90 percent relative humidity, then subjected to four consecutive immersion-and-regeneration cycles in which they were soaked in deionized water and dried for five hours at 75 degrees Celsius. The composite passed with room to spare: average diameter fluctuated by only about 8.5 percent overall and stabilized around 4.3 millimeters when dry, with wet-condition variations within roughly 6 percent. Crucially, no fragmentation, collapse, or macroscopic degradation appeared after four full cycles, and water uptake and evaporation behavior remained repeatable with no measurable loss of capacity—while pure bentonite and pure alginate reference samples lacked the structural integrity to endure immersion at all.

The tubular elements then went into a custom-built environmental chamber where temperature, humidity, and airflow were tightly controlled, with each tube connected to a closed hydraulic loop resting on a precision balance so that every gram of water lost through the tube wall could be tracked. In six-hour tests, evaporation rose with temperature as expected. The bentonite-rich composition achieved specific evaporation rates of 183, 289, and 312 grams per square meter per hour at ambient temperature, 30, and 40 degrees Celsius respectively, while the alginate-rich composition measured 141, 169, and 198 grams per square meter per hour under the same conditions—a difference the authors attribute to the denser alginate matrix hindering water diffusion. Thermographic imaging of a working tube showed a marked surface temperature drop when the water supply was cut but the wall remained wet, a direct visual signature of the latent heat being consumed by evaporation at the outer surface.

Longer, 24-hour runs on three tubes connected in series told a more sobering but important story. Series operation reduced evaporation rates to 97 grams per square meter per hour at ambient temperature and 151 at 40 degrees Celsius with deionized water, and to just 63 with 4 percent saline water—slightly saltier than average ocean water—because dissolved salt lowers vapor pressure. Yet the rate held steady after an initial transient in every case, and a salt mass balance confirmed that only water was leaving the circuit: the reservoir’s sodium chloride concentration rose from 4 to 4.5 percent as its mass fell from 64 to about 56 grams, exactly what selective evaporation should produce. Stability under continuous operation, including with saline feed, is precisely the property a façade-mounted module would need.

To gauge whether the concept scales, the team slotted their tubes, conceptually, into a one-square-meter vertical solar still configuration adapted from a rotating-disc design, replacing the moving assembly with static tube arrays—132 tubes for the first composition or 560 for the second, each 0.8 meters long. Assuming eight hours of effective daily operation and complete condensation, estimated freshwater productivity ranged from 7.3 to 17.8 liters per square meter per day depending on composition and temperature. Those figures sit comfortably within the range reported for evaporation-enhanced solar stills in the literature, systems that typically rely on spray jets, heat-storage materials, parabolic reflectors, porous fins, or rotating wicks. The new concept reaches comparable productivity through geometry alone—tubular self-supporting elements that multiply evaporation area—without mechanical assistance, and at operating temperatures no higher than 40 degrees Celsius, squarely in the low-thermal-grade regime.

The authors are careful about what these numbers mean. The assessment deliberately ignores airflow distribution, humidity accumulation, condensation efficiency, thermal interactions, shading, and the unquantified contribution of fan-driven convection in the lab, so the figures are concept-level estimates of scalability, not predictions of a finished system. Outdoor performance will hinge on irradiance, ambient temperature, humidity, wind, and façade orientation, and long-term questions of salt accumulation, fouling, and material ageing remain open. Still, the ingredients are commercially mundane, the extrusion and crosslinking steps are industrially standard, and the modular, self-supporting tubes can be sized to any façade and swapped out for maintenance. If the remaining engineering—greywater distribution, vapor condensation, and collection—can be integrated as cleanly as the material itself, the walls of our buildings may one day quietly distill the water their occupants use, one sunlit square meter at a time.

Subject of Research: Development and experimental characterization of a calcium alginate–bentonite evaporation module for façade-integrated, solar-driven decentralized freshwater production from greywater.

Article Title: Calcium alginate–bentonite evaporation module for façade integration and decentralized freshwater production using low-thermal-grade heat

Article References: Saija, A., Savoldi, L., Perino, M., & Gentile, V. (2026). Calcium alginate–bentonite evaporation module for façade integration and decentralized freshwater production using low-thermal-grade heat. Energy Reports, 16, Article 109696. https://doi.org/10.1016/j.egyr.2026.109696

Image Credits: AI Generated

DOI: 10.1016/j.egyr.2026.109696

Keywords: calcium alginate, bentonite, solar still, greywater recycling, building façade, decentralized water treatment, evaporation module, low-grade heat, freshwater production, water–energy nexus, biopolymer composite, passive distillation

The motivation behind the work is stark. Global plastic consumption was estimated at 700 million tonnes in 2021, yet only about six percent of that material is recycled. Projections cited by the authors suggest that by 2050 worldwide plastic use could climb to between 753.5 and 832.4 million tonnes, with global recycling of plastic waste still languishing at roughly 13 percent. Because conventional petrochemical plastics do not biodegrade, they fragment into microparticles that contaminate ecosystems and can even enter the human food chain. Bioplastics made from renewable agricultural resources such as starch are an attractive alternative, but they suffer from two chronic weaknesses: they absorb water readily and they lack mechanical strength.

Starch is one of the cheapest and most abundant biopolymers available. Cassava, in particular, is a major crop in Cameroon, which produces more than five million tonnes of roots every year—about 40 percent of the world’s production. Yet most of that cassava is consumed as food, and the industrial starch market remains underdeveloped. The researchers, led by Herman Assonfack Lekane of the University of Yaoundé I, set out to upgrade cassava starch into a viable plastic by reinforcing it with acid-hydrolyzed cellulose derived from Ceiba pentandra, a tropical tree known locally as Eteng, and then modifying the resulting composite with acacia gum and bentonite.

The cellulose was extracted from Eteng wood and then treated with 60 percent sulfuric acid to produce acid-hydrolyzed cellulose, abbreviated NCE in the study. The acid dissolves the amorphous regions of cellulose, leaving behind highly crystalline nanoscale fibrils. Characterization by scanning electron microscopy revealed fibers only a few nanometers thick after treatment, while X-ray diffraction confirmed a higher crystallinity index for the hydrolyzed material than for the raw cellulose. Infrared spectroscopy detected new bands at 1264 and 804 per centimeter, signatures of sulfate ester groups grafted onto the cellulose surface during the acid reaction. These charged groups, measured at a density of 8 times ten to the minus six moles per gram by conductimetry, help the particles disperse and can enhance thermal stability.

Three film formulations were prepared and compared. The reference composite, labeled AN, combined five percent cassava starch suspension with glycerol as a plasticizer, sodium carbonate, and ten percent NCE relative to starch mass. A second formulation, ANG, added 12.5 percent acacia gum—an exudate from African Vachellia nilotica trees supplied by a traditional production unit in northern Cameroon. The third, ANBG, further incorporated 30 percent bentonite clay relative to starch mass. Each suspension was gelatinized at 70 degrees Celsius for 30 minutes, cast into molds, and dried at 50 degrees Celsius for three days.

The most striking result concerned water. When films were exposed to a humid atmosphere of 87 percent relative humidity, the reference starch-cellulose film absorbed water rapidly, reaching a maximum uptake of about 30 percent after 300 minutes. Adding acacia gum cut that figure to roughly 20 percent, and the gum-bentonite combination reduced it to about 10 percent—a reduction of 18 percent relative to the gum-only film and a dramatic improvement over the pristine composite. Infrared analysis explained why: the gum and clay form hydrogen bonds with the starch and cellulose chains, occupying the molecular sites that water molecules would otherwise bind to. The intensity of the hydroxyl stretching band and the free-water deformation band both dropped in the modified films, confirming tighter internal bonding and less adsorbed water.

Mechanical testing delivered equally impressive numbers. The reference film had a Young’s modulus of 39.9 megapascals and a tensile strength of 1.46 megapascals. With acacia gum added, the modulus soared to 150.7 megapascals and the tensile strength climbed to 7.14 megapascals—nearly a fivefold increase in stiffness. The researchers attribute this hardening effect to the gum’s chemical functionality, which improves adhesion between the starch matrix and the cellulose reinforcement. Small molecules from the gum appear to intercalate between polymer chains, facilitating chain sliding while simultaneously building a denser network of bonds. Interestingly, adding bentonite on top of the gum partially reversed the gains: the gum-clay film reached a modulus of 133.3 megapascals and a strength of 4.13 megapascals, still well above the reference but below the gum-only material. The clay particles appear to interfere with polymer-gum networking and to aggregate into fragile domains that limit elongation.

Thermal analysis added further nuance. Differential scanning calorimetry showed that the melting of the starch component, recorded at 133 degrees Celsius in the reference film, shifted to 171 degrees Celsius with gum and rose a further 24 degrees with the gum-bentonite combination. The gum retards melting by increasing hydrogen bonding within the film, while the mineral clay acts as a barrier to heat diffusion through the matrix. Thermogravimetric analysis, evaluated with the Broido model between 300 and 350 degrees Celsius, revealed that activation energies decreased from 76.9 kilojoules per mole for the reference film to 69.9 with gum and 66.7 with gum plus bentonite, indicating progressively weaker internal interactions as additives were introduced. The authors propose an ordering of interaction energies: starch-cellulose bonding is strongest, followed by the gum-modified and then the gum-clay systems. Bentonite’s contribution is therefore physical rather than chemical—a heat shield rather than a bonding agent.

Perhaps the most consequential finding relates to biodegradation. Films were buried in soil from Mbalmayo in central Cameroon, with a pH of 5.1 and a composition of 65 percent sand, 29 percent clay and 21 percent silt, at 80 percent relative humidity and 25 degrees Celsius. Mass loss increased with burial time in all films, but the gum-containing formulations degraded noticeably more slowly. Because the microorganisms that decompose these materials depend on moisture, the reduced water uptake of the modified films starves them of the conditions they need to thrive. Bentonite further slows the process by drawing migrating water into the clay phase, leaving less available in the carbohydrate region where microbes operate. The authors suggest this controlled degradation could be a feature rather than a flaw: films that persist long enough to be useful but still break down naturally at end of life.

The study positions acacia gum as a genuine bio-hardener for starch-based plastics, echoing earlier work showing that African tree exudates can harden tannin-based wood adhesives. Because the gum is a natural, locally available material, it preserves the biodegradability of the composite while delivering performance that synthetic additives struggle to match. The gum-bentonite pairing, though less effective mechanically, offers a distinct advantage in moisture control and degradation management, pointing toward applications in food packaging, where limiting water uptake also limits bacterial growth. The authors note that the gum-bentonite films could serve for more than 200 minutes in highly humid conditions with less than 10 percent water uptake. For a field searching for sustainable materials that balance strength, cost and environmental fate, the message is clear: sometimes the answers are literally dripping from the trees.

Beyond the headline results, the study offers a useful reminder of how locally sourced materials can shape materials science outcomes. The acacia exudate used in the films came from a traditional production unit in northern Cameroon, meaning the hardening additive required no synthetic chemistry to obtain. Similarly, the bentonite and glycerol were standard commercial reagents, while the starch itself was extracted from cassava tubers softened in water for five days, washed, filtered, and air-dried at ambient temperature. The entire production chain relies on low-energy processing, with gelatinization carried out at just 70 degrees Celsius and drying at 50 degrees Celsius over three days.

The choice of Ceiba pentandra as the cellulose source is also notable. The tree, identified with assistance from the National Herbarium in Yaoundé, was collected in Mbalmayo, the same region whose soil later served as the biodegradation medium. Acid hydrolysis of the extracted cellulose followed established protocols, using repeated hot-water washing cycles, neutralization with dilute sodium hydroxide, ultrasonic dispersion, and freeze-drying to yield the final NCE powder. This level of procedural detail matters for reproducibility, since the surface chemistry of hydrolyzed cellulose, including its sulfate ester content, strongly influences how well the particles bond with a starch matrix.

Methodologically, the team combined a broad characterization toolkit: Fourier transform infrared spectroscopy and X-ray diffraction confirmed the presence and interactions of the additives, while coupled thermal analysis probed melting behavior and decomposition kinetics. Moisture uptake was tracked over 700 minutes in a controlled 87 percent relative humidity chamber, and mechanical response was quantified through stress-strain testing. The convergence of evidence from these independent techniques strengthens the authors’ interpretation that acacia gum acts primarily as a bonding agent between polymer chains, whereas bentonite functions as a physical barrier to both heat and water transport within the composite films.

Subject of Research: Effects of acacia gum and bentonite additives on the mechanical, thermal, moisture and biodegradation properties of cassava starch and acid-hydrolyzed cellulose composite bioplastics

Article Title: Effects of acacia gum and bentonite on the properties of composite bioplastics made of starch and acid hydrolyzed cellulose

Article References: Assonfack Lekane, H., Cheumani Yona, A. M., Tsague, F. L., Abo, T. M., Kuete, M. A., Ndinteh, D. T., Mbey, J. A., & Ndikontar, M. K. (2026). Effects of acacia gum and bentonite on the properties of composite bioplastics made of starch and acid hydrolyzed cellulose. Discover Industrial Chemistry and Materials, 1(1), Article 15. https://doi.org/10.1007/s44508-026-00014-x

Image Credits: AI Generated

DOI: 10.1007/s44508-026-00014-x

Keywords: bioplastics, cassava starch, acid-hydrolyzed cellulose, acacia gum, bentonite, biodegradation, moisture absorption, Young's modulus, hydrogen bonding, thermal stability, nanocellulose, sustainable materials