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<p>With the increasing severity of environmental pollution and the severe threat posed by heavy metal ions, the development of adsorbents with high capacity and selectivity for toxic metal species has attracted increasing attention. Porous organic polymers (POPs) feature large surface areas, diverse building units and linkages, as well as highly tunable structures, making them promising candidates for water purification. In this work, three POPs bearing different substituents were synthesized <i>via</i> a furan-maleimide Diels-Alder reaction. Their adsorption performance toward hexavalent chromium [Cr(VI)] was systematically evaluated. The results show that all three POPs exhibited the highest Cr(VI) uptake at pH=1. Kinetic studies revealed that the adsorption process followed a pseudo-second-order kinetic model, while the equilibrium data were well described by the Langmuir isotherm, indicating monolayer adsorption on homogeneous sites. Among the three POPs, Por-OMe, which incorporated an electron-donating methoxy group, displayed the highest adsorption capacity for Cr(VI), reaching 697.4 mg/g. These results demonstrate that furan-maleimide Diels-Alder chemistry provides an effective strategy to construct functional POPs and that electronic modulation of the framework is a viable approach to enhance Cr(VI) adsorption performance.</p>

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Substituent-engineered Furan-Maleimide Porous Organic Polymers via Diels-Alder Cycloaddition for Efficient Cr(VI) Adsorption

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Jiao Zhou,
  • Ao-Ming Jing,
  • Long-Yu Li,
  • Shi-Jie Ren

摘要

With the increasing severity of environmental pollution and the severe threat posed by heavy metal ions, the development of adsorbents with high capacity and selectivity for toxic metal species has attracted increasing attention. Porous organic polymers (POPs) feature large surface areas, diverse building units and linkages, as well as highly tunable structures, making them promising candidates for water purification. In this work, three POPs bearing different substituents were synthesized via a furan-maleimide Diels-Alder reaction. Their adsorption performance toward hexavalent chromium [Cr(VI)] was systematically evaluated. The results show that all three POPs exhibited the highest Cr(VI) uptake at pH=1. Kinetic studies revealed that the adsorption process followed a pseudo-second-order kinetic model, while the equilibrium data were well described by the Langmuir isotherm, indicating monolayer adsorption on homogeneous sites. Among the three POPs, Por-OMe, which incorporated an electron-donating methoxy group, displayed the highest adsorption capacity for Cr(VI), reaching 697.4 mg/g. These results demonstrate that furan-maleimide Diels-Alder chemistry provides an effective strategy to construct functional POPs and that electronic modulation of the framework is a viable approach to enhance Cr(VI) adsorption performance.