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<p>Cr(VI) poses a significant threat to the global aquatic environment’s safety due to its high toxicity and cell permeability. Therefore, the development of novel and efficient adsorbents for Cr(VI) removal from aqueous solutions is of great importance. In this study, three N-containing organic compounds were selected to modify laponite (LAP) via three strategies: copolymerization, surface modification, and interlayer intercalation, resulting in three modified adsorbents: P(DVB-VIm)/LAP, PEI/LAP, and PANI/LAP. Characterization of the modified adsorbents was performed using FTIR, XRD, BET, SEM, and TEM. Compared with LAP, the P(DVB-VIm)/LAP (10.623&#xa0;nm), PEI/LAP (12.877&#xa0;nm), and PANI/LAP (12.896&#xa0;nm) exhibited larger pore sizes. Under pH 2, the maximum Cr(VI) adsorption capacities of P(DVB-VIm)/LAP, PEI/LAP, and PANI/LAP were 59.38, 56.31, and 55.77 mg·g<sup>− 1</sup>, respectively. XPS analysis of the adsorbents after Cr(VI) adsorption was conducted to elucidate the adsorption mechanism. The results indicated that the three composites primarily removed Cr(VI) through electrostatic adsorption and reduction, while complexation and pore adsorption also contributed to a certain extent. By combining zeta potential analysis, the effect of pH variation on the performance of three adsorbents was investigated; there pH<sub>PZC</sub> values are 5.31, 6.71, and 6.55, respectively. The adsorption efficiency remained above 50% even after at least 9 consecutive adsorption-desorption cycles. Kinetic studies revealed that the Cr(VI) adsorption process of the three composites followed the pseudo-second-order kinetic model. This study has revealed that organo-N modified laponite holds promising application prospects in the field of Cr(VI) removal. </p>

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Performance and mechanism of Cr(VI) adsorption in an aqueous solution by laponite modified with N-containing porous polymers

  • 期刊论文

  • 发表日期：

    2025年11月28日

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  • Jiajia Jiang,
  • Junhu Zhao,
  • Ming Li,
  • Wusheng Rao,
  • Tian Zhang

摘要

Cr(VI) poses a significant threat to the global aquatic environment’s safety due to its high toxicity and cell permeability. Therefore, the development of novel and efficient adsorbents for Cr(VI) removal from aqueous solutions is of great importance. In this study, three N-containing organic compounds were selected to modify laponite (LAP) via three strategies: copolymerization, surface modification, and interlayer intercalation, resulting in three modified adsorbents: P(DVB-VIm)/LAP, PEI/LAP, and PANI/LAP. Characterization of the modified adsorbents was performed using FTIR, XRD, BET, SEM, and TEM. Compared with LAP, the P(DVB-VIm)/LAP (10.623 nm), PEI/LAP (12.877 nm), and PANI/LAP (12.896 nm) exhibited larger pore sizes. Under pH 2, the maximum Cr(VI) adsorption capacities of P(DVB-VIm)/LAP, PEI/LAP, and PANI/LAP were 59.38, 56.31, and 55.77 mg·g− 1, respectively. XPS analysis of the adsorbents after Cr(VI) adsorption was conducted to elucidate the adsorption mechanism. The results indicated that the three composites primarily removed Cr(VI) through electrostatic adsorption and reduction, while complexation and pore adsorption also contributed to a certain extent. By combining zeta potential analysis, the effect of pH variation on the performance of three adsorbents was investigated; there pHPZC values are 5.31, 6.71, and 6.55, respectively. The adsorption efficiency remained above 50% even after at least 9 consecutive adsorption-desorption cycles. Kinetic studies revealed that the Cr(VI) adsorption process of the three composites followed the pseudo-second-order kinetic model. This study has revealed that organo-N modified laponite holds promising application prospects in the field of Cr(VI) removal.