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Kinetic, Isothermal and Thermodynamic Study on the Removal of Hexavalent Chromium with Biocomposites (Cellulose–PLA)
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This study investigates the removal of bisphenol A (BPA)—an endocrine-disrupting chemical common in plastics—from aqueous solutions using an adsorbent material, characterizing the process through kinetic, isotherm, and thermodynamic analyses. Results indicate that BPA adsorption follows pseudo-second-order kinetics and fits the Langmuir isotherm model, suggesting monolayer adsorption on a homogeneous surface. The thermodynamic data confirm the process is spontaneous and endothermic, supporting the adsorbent's potential for water treatment applications.
Currently, water is being polluted via various anthropogenic activities, resulting in wastewater contaminated with multiple pollutants, including heavy metals. Hexavalent chromium is a toxic heavy metal that poses significant health risks upon exposure. Biocomposites are materials that are partially composed of organic substances that enhance different properties of a composite. The aim of this study was to evaluate the kinetic, isothermal, and thermodynamic behaviour of a cellulose-based biocomposite with polylactic acid (PLA) for the removal of Cr (VI) from synthetic water. The results indicated that the Freundlich and Elovich models provided the best fit for the isothermal and kinetic data, with R2 values of 0.671 and 0.973, respectively, suggesting that the adsorption process was chemical in nature and occurred on a heterogeneous, multilayer surface. Additionally, the thermodynamic analysis revealed that the adsorption process was exothermic, irreversible, and non-spontaneous. This study presents an innovative approach to the removal of metal ions using a cellulose–PLA biocomposite for wastewater treatment, offering kinetic, isothermal, and thermodynamic data applicable to the adsorption of other heavy metals.
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Researchers studied how UV exposure and organic matter influence the interaction between chromium and biodegradable poly(lactic acid) microplastics in water. They found that pristine PLA has low affinity for chromium, but the presence of organic matter like humic and tannic acids increased chromium adsorption by up to 620-fold, while UV-induced photooxidation of PLA also substantially enhanced adsorption. The study provides important insights into how environmental conditions alter the ability of biodegradable microplastics to transport heavy metals in aquatic systems.
Comparison of Hexavalent Chromium Adsorption Behavior on Conventional and Biodegradable Microplastics
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Researchers compared hexavalent chromium adsorption behavior on conventional versus biodegradable microplastics, finding that polymer chemistry and surface aging significantly affect chromium binding capacity and the risk of co-transport in contaminated environments.
Comparing the influence of humic/fulvic acid and tannic acid on Cr(VI) adsorption onto polystyrene microplastics: Evidence for the formation of Cr(OH)3 colloids
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Researchers compared how humic/fulvic acid and tannic acid affect chromium(VI) adsorption onto polystyrene microplastics, finding that dissolved organic matter promotes the formation of Cr(OH)3 colloids, complicating the role of microplastics as heavy metal vectors.
Aging amplifies synergistic adsorption and reduction of Cr(VI) by polyamide microplastics
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Researchers found that UV and chemical aging of polyamide microplastics amplified their adsorption and reduction of hexavalent chromium Cr(VI), increasing oxygen-containing functional groups while reducing amide bonds, with Cr(VI) binding driven by electrostatic forces and hydrogen bonds and the aged microplastics able to reduce Cr(VI) to less toxic Cr(III) even under UV light and oxygen-depleted conditions.
Interaction characteristics and mechanism of Cr(VI)/Cr(III) with microplastics: Influence factor experiment and DFT calculation
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Researchers investigated how two types of microplastics, polyamide and polyethylene, interact with toxic chromium in different forms across various environmental conditions. They found that polyamide had a much higher capacity to adsorb both forms of chromium, and that environmental factors like pH, temperature, and salinity significantly influenced the interaction. The study provides insights into how microplastics may affect the transport and toxicity of chromium contamination in the environment.
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