Public concern about poly- and perfluoroalkyl substances (PFAS) in the environment has been raised due to their potential toxicity and environmental endurance. Adsorption using granular activated carbon (GAC) is a widespread strategy to remove PFAS. Herein, regeneration of PFAS-saturated GAC was studied and organic/inorganic mixed solutions were used to regenerate exhausted GAC. Optimization experiments revealed that a regenerant solution consisting of 0.1 mol/L HCl in ethanol with a 30-min residence time effectively regenerated PFAS-saturated GAC. The results showed that even after the fifth usage cycle, the proposed regeneration method can efficiently regenerate the PFAS-saturated GAC. Identification of the regeneration mechanism indicated that the regeneration process can be attributed to physical displacement and solubilization of PFAS from exhausted GAC. Additionally, BET analysis of PFAS-saturated and regenerated GACs revealed an increase in total pore volume and BET surface area in regenerated GACs, demonstrating the suggested method’s regeneration capabilities.

中文翻译：

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使用有机/无机混合溶液再生负载全氟辛烷磺酸（PFOS）的颗粒活性炭


由于其潜在的毒性和环境耐受性，公众对环境中的多氟烷基物质和全氟烷基物质 (PFAS) 的关注日益增加。使用颗粒活性炭 (GAC) 吸附是去除 PFAS 的一种广泛采用的策略。本文研究了 PFAS 饱和的 GAC 的再生，并使用有机/无机混合溶液来再生废 GAC。优化实验表明，由0.1 mol/L HCl 乙醇组成的再生剂溶液，停留时间为30 分钟，可有效再生PFAS 饱和的GAC。结果表明，即使在第五个使用周期之后，所提出的再生方法也可以有效地再生 PFAS 饱和的 GAC。再生机制的鉴定表明，再生过程可归因于废活性炭中 PFAS 的物理置换和溶解。此外，PFAS 饱和和再生 GAC 的 BET 分析显示，再生 GAC 的总孔体积和 BET 表面积有所增加，证明了建议方法的再生能力。