Perfluorooctane Sulfonate (PFOS) is widely used in various commercial applications, including food packaging, fabrics, and fire-fighting foams. This toxic and carcinogenic compound could be present in water and food products, which could be fatal to living beings. Zeolite-based materials are promising PFOS sorbents due to their high anion exchange capacity and specific surface area. In this study, a natural Clinoptilolite-type zeolite was modified with Hexadecyl Trimetilammonium Bromide (HDTMA) for PFOS remediation in aqueous solutions. The modification introduced an inversion of Clinoptilolite's natural surface net charge, i.e., from negative to positive, making it effective in capturing PFOS. At pH 7, the modified material (Clinop_HDTMA) showed ~ 96–98% removal of PFOS at a low concentration range of 0.5–1 mg L⁻¹. The adsorption isotherm and kinetic data followed the Freundlich and pseudo second-order model, respectively, which suggested the involvement of physicochemical forces in the adsorption process. Thus, this study demonstrates a viable and cost-effective solution to remove PFOS ions from wastewater.

Graphical Abstract

中文翻译：

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用于去除水溶液中全氟辛烷磺酸 (PFOS) 的新型改性天然斜发沸石

全氟辛烷磺酸 (PFOS) 广泛用于各种商业应用，包括食品包装、织物和消防泡沫。这种有毒和致癌化合物可能存在于水和食品中，对生物可能致命。沸石基材料由于其高阴离子交换容量和比表面积，是有前途的全氟辛烷磺酸吸附剂。在本研究中，用十六烷基三甲基溴化铵 (HDTMA) 改性天然斜发沸石型沸石，用于修复水溶液中的全氟辛烷磺酸。该改性引入了斜发沸石天然表面净电荷的反转，即从负电荷变为正电荷，使其能够有效捕获全氟辛烷磺酸。在 pH 7 时，改性材料 (Clinop_HDTMA) 在 0.5–1 mg L ^-1的低浓度范围内可去除约 96–98% 的 PFOS 。吸附等温线和动力学数据分别遵循Freundlich和伪二阶模型，这表明物理化学力参与了吸附过程。因此，本研究展示了一种可行且经济高效的去除废水中 PFOS 离子的解决方案。

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