Surface-modified biopolymers for removing mixtures of per- and polyfluoroalkyl substances from water: Screening and removal mechanisms
Surface-modified biopolymers for removing mixtures of per- and polyfluoroalkyl substances from water: Screening and removal mechanisms
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DOI：
10.1016/j.envpol.2023.121865
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发表时间：
2023-05-26
影响因子：
8.9
通讯作者：
Liang，Yanna
中科院分区：
文献类型：
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作者：
Ilango，Aswin Kumar;Jiang，Tao;Liang，Yanna
去除水中的全氟烷基和多氟烷基物质（PFASs）需要绿色、可再生和可持续的材料。在此，我们合成并测试了海藻酸盐（ALG）和壳聚糖（CTN）基和聚乙烯亚胺（PEI）功能化纤维/气凝胶，用于从初始浓度为10 μg/L的水中吸附12种pfas（9种短链和长链PFAAs， GenX和2种前体）的混合物。在11种生物吸附剂中，ALGPEI-3和GTH CTNPEI气凝胶的吸附性能最好。通过对PFASs吸附前后吸附剂的详细表征，发现疏水相互作用是控制PFASs吸附的主要机制，静电相互作用起次要作用。结果表明，两种气凝胶在pH 2 ~ 10范围内对相对疏水性的PFASs均具有快速、优越的吸附性能。即使在极端的pH条件下，气凝胶也能完美地保持其形状。根据等温线，ALGPEI-3气凝胶和GTH-CTNPEI气凝胶对全氟辛烷磺酸的最大吸附量分别为3045 mg/g和12133 mg/g。虽然GTH-CTNPEI气凝胶对短链PFAS的吸附性能不太理想，在24 h内的吸附性能在70 - 90%之间变化，但它可以在复杂和极端环境中高浓度去除相对疏水的PFAS。
Green, renewable, and sustainable materials are needed for removing per- and polyfluoroalkyl substances (PFASs) in water. Herein, we synthesized and tested alginate (ALG) and chitosan (CTN) based and polyethyleneimine (PEI) functionalized fibers/aerogels for the adsorption of mixtures of 12 PFASs (9 short- and long-chain PFAAs, GenX, and 2 precursors) from water at an initial concentration of 10 μg/L each. Out of 11 biosorbents, ALGPEI-3 and GTH CTNPEI aerogels had the best sorption performance. Through detailed characterization of the sorbents before and after PFASs sorption, it was revealed that hydrophobic interaction was the dominant mechanism controlling PFASs sorption while electrostatic interactions played a minor role. As a result, both aerogels had fast and superior sorption of relatively hydrophobic PFASs from pH 2 to 10. Even at extreme pH conditions, the aerogels retained their shape perfectly. Based upon the isotherms, the maximum adsorption capacity of ALGPEI-3 and GTH-CTNPEI aerogels towards total PFASs removal was 3045 and 12,133 mg/g, respectively. Although the sorption performance of the GTH-CTNPEI aerogel toward short chain PFAS was less than satisfactory and varied between 70 and 90% in 24 h, it may find its use in removing relatively hydrophobic PFAS at high concentrations in complex and extreme environments.