The development of porous adsorbents for removal of concomitant perfluorooctane sulfonate (PFOS) and dichromate pollutants is pivotal and challenging in wastewater remediation. Herein, we presented a leaf-inspired artificial cleaning system based on an ionic polymer (ImIP-6) with high local density of imidazolium moieties and charge-balanced chloride for efficiently simultaneous removal of PFOS and dichromate. ImIP-6 exhibits fast kinetics and ultrahigh uptake capacities with maximum adsorption values of 2606 mg g⁻¹ for PFOS and 247 mg g⁻¹ for Cr(VI), which are far superior to many porous sorbents. The mechanism studies have evidenced that ImIP-6 possesses two types of domains for PFOS and dichromate adsorption, in which the imidazolium-based cationic surface induces PFOS enrichment and subsequent formation of micelles on the outer surfaces without significantly interfering the adsorption of dichromate in the interior pores. This work provides one new approach based on biomimetic systems with hierarchical adsorption domains for wastewater remediation.

中文翻译：

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用于去除全氟辛烷磺酸盐和重铬酸盐的新型多级离子聚合物


开发用于去除伴随的全氟辛烷磺酸盐 （PFOS） 和重铬酸盐污染物的多孔吸附剂在废水修复中至关重要且具有挑战性。在此，我们提出了一种基于离子聚合物 （ImIP-6） 的叶状人工清洁系统，该系统具有高局部密度的咪唑部分和电荷平衡氯化物，可有效同时去除 PFOS 和重铬酸盐。ImIP-6 表现出快速动力学和超高的摄取能力，对 PFOS 的最大吸附值为 2606 mg ^g-1，对 Cr（VI） 的最大吸附值为 247 mg ^g-1，远优于许多多孔吸附剂。机理研究证明，ImIP-6 具有 PFOS 和重铬酸盐吸附两种类型的结构域，其中基于咪唑的阳离子表面诱导 PFOS 富集并随后在外表面形成胶束，而不会显着干扰重铬酸盐在内部孔隙中的吸附。这项工作提供了一种基于具有分层吸附域的仿生系统的新方法，用于废水修复。