Enhanced Adsorption of Mixtures of Per- and Polyfluoroalkyl Substances in Water by Chemically Modified Activated Carbon
Enhanced Adsorption of Mixtures of Per- and Polyfluoroalkyl Substances in Water by Chemically Modified Activated Carbon
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DOI：
10.1021/acsestwater.3c00483
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发表时间：
2023-10
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影响因子：
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通讯作者：
Aswin Kumar Ilango;Tao Jiang;Weilan Zhang;Md. Nahid Pervez;Jeremy I. Feldblyum;H. Efstathiadis;Yanna Liang
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文献类型：
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作者：
Aswin Kumar Ilango;Tao Jiang;Weilan Zhang;Md. Nahid Pervez;Jeremy I. Feldblyum;H. Efstathiadis;Yanna Liang
颗粒活性炭（GAC）和粉末活性炭（PAC）的化学改性是增强去除水中全氟烷基和多氟烷基物质（PFAS）的必要条件。本文中，我们合成并测试了针铁矿（α-FeOOH）包覆的GAC和PAC对水中13种PFAS（9种短链和长链PFAA、GenX和3种前体）的混合物的吸附，初始浓度为10 μg/L。在所测试的吸附剂中，与原始PAC和GAC以及改性GAC（MGAC）相比，改性PAC（MPAC）具有优异的吸附。根据吸附等温线，MPAC对PFAS的最大吸附量为234 mg/g。详细的表征表明，MPAC的吸附性能是由于其粉末的性质，这使得更短的扩散路径和快速的传质，在这种吸附剂的内部孔除了静电和疏水相互作用。从这项研究中获得的结果提供了有价值的见解和知识，适当修改GAC和PAC，以解决与PFAS相关的关键挑战，特别是与短链化合物相关的挑战。
Chemical modifications of granular activated carbon (GAC) and powdered activated carbon (PAC) are necessary for enhanced removal of perfluoroalkyl and polyfluoroalkyl substances (PFAS) in water. Herein, we synthesized and tested goethite (α-FeOOH)-coated GAC and PAC for the adsorption of mixtures of 13 PFAS (9 short- and long-chain PFAAs, GenX, and 3 precursors) from water at an initial concentration of 10 μg/L for each. Among the sorbents tested, modified PAC (MPAC) had excellent adsorption compared to pristine PAC and GAC and modified GAC (MGAC). Based on the isotherms, the maximum adsorption capacity of MPAC toward total PFAS removal was 234 mg/g. Detailed characterizations revealed that the adsorption performance of MPAC was due to its powdered nature, which enabled a shorter diffusion path and rapid mass transfer in the internal pores of this sorbent in addition to the electrostatic and hydrophobic interactions. Results obtained from this study provide valuable insights and knowledge for properly modifying GAC and PAC to address the critical challenges associated with PFAS, especially those associated with short-chain compounds.