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<p>Hexavalent chromium (Cr(VI)) contamination in water poses severe environmental and health risks, necessitating efficient and sustainable removal technologies. A water-based polyacrylic resin was synthesized via inverse emulsion polymerization using methyl methacrylate, acrylic acid, and maleic anhydride, thereby avoiding the use of organic solvents. Under optimal conditions (0.8&#xa0;g dosage, pH 2, 318&#xa0;K, 12&#xa0;h), the resin achieves 98.73% Cr(VI) removal from 1&#xa0;mg/L wastewater,&#xa0;following the pseudo-second-order kinetic model (<i>R</i><sup>2</sup> = 0.9927). Furthermore, the adsorption is well-fitted to the Langmuir model (<i>R</i><sup>2</sup> = 0.9911),&#xa0;yielding a calculated maximum adsorption capacity of 142.86&#xa0;mg/g. FTIR analysis confirms chemisorption via Cr–O bond formation as the key mechanism. Thermodynamic analysis supports this chemisorption dominance, revealing an exothermic process (Δ<i>H</i> = 138.47&#xa0;kJ/mol) with high spontaneity (Δ<i>G</i> &lt; 0). Characterization via SEM/XRD shows the resin’s 3D porous structure maintains integrity post-adsorption. Significantly, acid–base elution enables high regeneration efficiency (&gt; 93%) over 5 cycles without secondary pollution.&#xa0;These findings highlight the promising potential of the water-based polyacrylic resin as a macromolecular adsorbent for the efficient removal of Cr(VI) ions from wastewater, offering a viable solution for wastewater treatment.</p>

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Adsorption of Cr(VI) ions from wastewater using water-based polyacrylic resin

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月13日

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  • Yunwei Huang,
  • Shaoyu Lin,
  • Pingke Ai,
  • Chunsheng Li,
  • Feihua Ye,
  • Jiaping Gan,
  • Jiachun Xu,
  • Lingling Su,
  • Qiumin Chen,
  • Junhua Chen,
  • Jiangfei Cao

摘要

Hexavalent chromium (Cr(VI)) contamination in water poses severe environmental and health risks, necessitating efficient and sustainable removal technologies. A water-based polyacrylic resin was synthesized via inverse emulsion polymerization using methyl methacrylate, acrylic acid, and maleic anhydride, thereby avoiding the use of organic solvents. Under optimal conditions (0.8 g dosage, pH 2, 318 K, 12 h), the resin achieves 98.73% Cr(VI) removal from 1 mg/L wastewater, following the pseudo-second-order kinetic model (R2 = 0.9927). Furthermore, the adsorption is well-fitted to the Langmuir model (R2 = 0.9911), yielding a calculated maximum adsorption capacity of 142.86 mg/g. FTIR analysis confirms chemisorption via Cr–O bond formation as the key mechanism. Thermodynamic analysis supports this chemisorption dominance, revealing an exothermic process (ΔH = 138.47 kJ/mol) with high spontaneity (ΔG < 0). Characterization via SEM/XRD shows the resin’s 3D porous structure maintains integrity post-adsorption. Significantly, acid–base elution enables high regeneration efficiency (> 93%) over 5 cycles without secondary pollution. These findings highlight the promising potential of the water-based polyacrylic resin as a macromolecular adsorbent for the efficient removal of Cr(VI) ions from wastewater, offering a viable solution for wastewater treatment.