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Adsorption Performance of Fe–Mn Polymer Nanocomposites for Arsenic Removal: Insights from Kinetic and Isotherm Models
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This study evaluates iron-manganese polymer nanocomposites as adsorbents for removing arsenic from contaminated water, characterizing their adsorption capacity, kinetics, and selectivity under varying conditions. The nanocomposites demonstrated high arsenic removal efficiency, attributed to the synergistic interaction between Fe-Mn oxides and the polymer matrix, which enhanced surface area and active binding sites. The results suggest these materials are promising candidates for low-cost, effective arsenic remediation in drinking water systems.
Global concern over arsenic contamination in drinking water necessitates innovative and sustainable remediation technologies. This study evaluates the adsorption performance of Fe-Mn binary oxide (FMBO) nanocomposites developed by coating polyethylene (PE) and polyethylene terephthalate (PET) with FMBO for the removal of As(III) and As(V) from water. Adsorption kinetics were rapid, with equilibrium achieved within 1-4 h depending on the material and pH. PET-FMBO and FMBO exhibited faster rates and higher arsenic removal (up to 96%) than PE-FMBO. Maximum As(III) adsorption capacities ranged from 4.76 to 5.75 mg/g for PE-FMBO, 7.2 to 12.0 mg/g for PET-FMBO, and up to 20.8 mg/g for FMBO, while capacities for As(V) ranged from 5.20 to 5.60 mg/g, 7.63 to 18.4 mg/g, and up to 46.2 mg/g, respectively. The results of the Dubinin-Radushkevich isotherm model, with free energy (Ea) values exceeding 16 kJ/mol, suggest chemisorption is the dominant mechanism, which is supported by the kinetics data. Given the effective removal of As(III), chemisorption likely proceeds through ligand exchange during the Mn oxide-mediated oxidation of As(III) and complexation with hydroxyl groups on the nanocomposite. These findings highlight the strong potential of Fe-Mn polymer nanocomposites, particularly PET-FMBO, for efficient arsenic removal during practical water treatment applications.
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Researchers investigated the full end-of-life management cycle of iron-manganese polymer nanocomposites used for arsenic removal from water, evaluating their regeneration performance over multiple reuse cycles, stabilization methods for spent material, and environmental safety to ensure these water treatment materials can be responsibly managed after use.
Arsenic adsorption by functionalized polystyrene microplastics: kinetics and mechanisms
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This study investigated arsenic adsorption characteristics for As(III) and As(V) onto two functionalized 80–82 nm polystyrene microplastics—carboxyl-modified (PS-COOH) and amine-modified (PS-NH2). PS-COOH achieved higher maximum adsorption capacities of 0.57 mg/g for As(III) and 0.37 mg/g for As(V), with hydrogen bonding, hydroxyl complexation, and electrostatic forces identified as key mechanisms via pseudo-second-order kinetics and Langmuir isotherm modeling. Adsorption was significantly inhibited by increasing salinity and humic acid, confirming that microplastics can alter the environmental behavior of arsenic in aquatic ecosystems.
Competitive mechanism of microplastic addition for the adsorption of arsenic from an aqueous solution by magnetic biochar-supported layered double hydroxide
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Researchers investigated competitive interactions between different microplastic types and pentavalent arsenic (As(V)) during adsorption onto a magnetic biochar-supported layered double hydroxide composite (MBC@LDH), examining the effects of pH, ionic strength, temperature, material dosage, and microplastic concentration. Their results revealed that microplastic presence significantly altered As(V) adsorption efficiency, with the competitive mechanisms varying by microplastic type and solution conditions.
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When plastic waste breaks down in the environment (from sun, acids, or other weathering), its surface changes in ways that make it much better at binding arsenic, a toxic contaminant commonly found in water. This matters because these "aged" microplastics, which are now widespread in our water supplies, could act as carriers that transport arsenic through waterways and potentially into the food chain or drinking water. The findings suggest that weathered microplastics might pose a greater risk for spreading arsenic contamination than fresh plastic particles, though more research is needed to understand what this means for human exposure.
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This study developed new coagulant chemicals for removing arsenic from drinking water and tested how the presence of microplastics affects the treatment process. Microplastics in the water interfered with arsenic removal by competing for the coagulant chemicals, reducing treatment effectiveness. The findings highlight a practical concern: as microplastic contamination in water sources increases, it may make it harder to remove other dangerous pollutants from drinking water.
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