氯化钙改性纳滤膜有效去除饮用水中PFASs

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中图分类号：X52 文献标志码：A DOI： 10.3969/j .issn.1003-9015.2025.04.020

文章编号：1003-9015（2025）04-0762-11

Abstract：With the progresson of industrialization，an increasing number of emerging contaminants （ECs）have entered natural water bodies.Among these，per-and poly-fluoroalkyl substances （PFASs）are aparticular classof synthetic compoundscharacterized by their exceptional stability，bioaccumulation potential，and toxicity，posing significant threats to human and ecological health. This study introduced calcium chloride （ CaCl2 ）into the aqueous phase to facilitate the chelation between Ca2+ and acyl chloride monomers，thereby internally regulating the interfacial polymerization（IP）reaction．Asaresult，a CaCl2 -modified nanofiltration membrane（ CaCl2 -TFC）was succesfully prepared，featuring a thinner，rougher，more hydrophilic surface with enhanced negative charge and a lowermolecular weight cut-off. The impact of CaCl2 concentration on the separation performance of the nanofiltration membrane was investigated. The results indicate that the modified membrane achieves a pure water flux of 101. （204号 86L⋅m-2⋅h-1 ，nearly 3.28 times that of unmodified TFC membrane，with a Na2SO4 rejection rate of 95.61% ，overcomingthe trade-off effct of TFC membranes.This alleviates the trade-offeffect between water permeability and solute rejection to some extent. Furthermore，the membrane exhibites rejection rates of 95.78% and 90.92% for PFHxAandPFHxS，respectively.Thisresearch presents a simple，environmentally friendly，and low-cost method for thefabricationof TFC NF membranes，applying it to the treatmentof PFASsand providing atechnical reference for ensuringdrinking water safety.

Key words：drinking water safety；nanofiltration membrane；thin-film composite；PFASs；trade-off ffect

1前言

自然水体中的新污染物（ECs）已成为危害人体和生态健康的重大要素之一[1]。（剩余16222字）