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<p>Removing polyfluoroalkyl substances (PFASs) at ng l<sup>−1</sup> levels from drinking water to meet the United States Environmental Protection Agency regulations remains challenging. Here we develop an electro-activated affinity-driven membrane (ADM) featuring dual binding sites by selectively anchoring small ions (Cl⁻) and bulky amphiphilic molecules (dioctyl sulfosuccinate) onto the polypyrrole layer. Through transient electrical activation, the ADM effectively reduces diverse PFASs from tap and surface waters at environmentally relevant concentrations (for example, 200 ng l<sup>−1</sup>) to levels below regulatory thresholds. This outstanding separation performance stems from the sequential action of hydrophobic and electrostatic interactions and forced convection in filtration mode. During long-term operation for three months, the ADM presents the exceptional ability to remove nearly 100% of perfluorooctanoic acid from water, with a maximum effective flux of 288 l m<sup>−2</sup> h<sup>−1</sup> bar<sup>−1</sup> and outstanding economy. These metrics outperform commercial high-pressure membranes, making our ADM an excellent choice for addressing PFAS risks in drinking water.</p>

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Electro-activated dual-affinity membrane for efficiently removing per- and polyfluoroalkyl substances from drinking water

  • 期刊论文

  • 发表日期：

    2025年9月24日

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  • Lie Liu,
  • Xiaoqiang An,
  • Jiaqi Bai,
  • Yujia Zhang,
  • Huachun Lan,
  • Huijuan Liu,
  • Jiuhui Qu

摘要

Removing polyfluoroalkyl substances (PFASs) at ng l−1 levels from drinking water to meet the United States Environmental Protection Agency regulations remains challenging. Here we develop an electro-activated affinity-driven membrane (ADM) featuring dual binding sites by selectively anchoring small ions (Cl⁻) and bulky amphiphilic molecules (dioctyl sulfosuccinate) onto the polypyrrole layer. Through transient electrical activation, the ADM effectively reduces diverse PFASs from tap and surface waters at environmentally relevant concentrations (for example, 200 ng l−1) to levels below regulatory thresholds. This outstanding separation performance stems from the sequential action of hydrophobic and electrostatic interactions and forced convection in filtration mode. During long-term operation for three months, the ADM presents the exceptional ability to remove nearly 100% of perfluorooctanoic acid from water, with a maximum effective flux of 288 l m−2 h−1 bar−1 and outstanding economy. These metrics outperform commercial high-pressure membranes, making our ADM an excellent choice for addressing PFAS risks in drinking water.