PAN/PEI纳米纤维膜吸附水中PFOA性能研究

贺坤振; 刘琰; 邢兴; 李箐湲; 王静

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中国环境科学 ›› 2026, Vol. 46 ›› Issue (2) : 809-820.

水污染与控制

PAN/PEI纳米纤维膜吸附水中PFOA性能研究

贺坤振^1,2, 刘琰^1,2, 邢兴², 李箐湲², 王静²

作者信息 +

Study on the adsorption performance of PAN/PEI nanofiber membranes for aqueous PFOA

HE Kun-zhen^1,2, LIU Yan^1,2, XING Xing², LI Jing-yuan², WANG Jing²

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文章历史 +

摘要

通过静电纺丝技术制备聚丙烯腈(PAN)/聚乙烯亚胺(PEI)复合纳米纤维膜,系统探究其对全氟辛酸(PFOA)的吸附性能及机制.结果表明,当PEI掺杂量为3%时,材料对PFOA的饱和吸附容量达1145.55mg/g,显著优于低PEI含量样品.吸附过程符合Langmuir单层吸附模型,且在酸性条件下(pH=3)吸附率最高,主要依赖PEI质子化胺基与PFOA的静电相互作用.共存腐植酸(HA)和阴阳离子(如Ca²⁺,Mg²⁺,Fe³⁺,HCO₃^-,SO₄^2-)对吸附有一定抑制作用,但高PEI含量可增强材料抗干扰能力.采用90%甲醇联合0.3mol/L NaCl作为脱附剂,经5次吸附-脱附循环后,材料仍保持88.32%的吸附效率,展现出优异的可重复使用性.结合材料表征和吸附性能分析,推测表明,吸附机制以静电相互作用为主,辅以疏水相互作用.

Abstract

Polyacrylonitrile (PAN)/ polyethyleneimine (PEI) composite nanofiber membranes fabricated via electrospinning were systematically investigated for their adsorption performance and mechanisms toward perfluorooctanoic acid (PFOA). Results showed that when PEI content was 3%, the material achieved the highest saturated adsorption capacity of 1145.55mg/g for PFOA, significantly exceeding samples with lower PEI contents. The adsorption process adhered to the Langmuir monolayer adsorption model, with optimal efficiency observed under acidic conditions (pH = 3), primarily relying on electrostatic interactions between protonated PEI amines and PFOA. Coexisting humic acid (HA) and ions (e.g., Ca²⁺, Mg²⁺, Fe³⁺, HCO₃^-, SO₄^2-) exhibited inhibitory effects, while elevated PEI content enhanced the materials’ resistance to interference. Using 0.3mol/L NaCl in 90% methanol as the desorbent, the material retained 88.32% adsorption efficiency after five adsorption-desorption cycles, demonstrating excellent recyclability. Combined analyses of material characterization and adsorption performance indicated that the primary mechanisms were electrostatic interactions, supplemented by hydrophobic interaction.

导出引用

贺坤振, 刘琰, 邢兴, 李箐湲, 王静. PAN/PEI纳米纤维膜吸附水中PFOA性能研究[J]. 中国环境科学. 2026, 46(2): 809-820

HE Kun-zhen, LIU Yan, XING Xing, LI Jing-yuan, WANG Jing. Study on the adsorption performance of PAN/PEI nanofiber membranes for aqueous PFOA[J]. China Environmental Science. 2026, 46(2): 809-820

中图分类号： X703.1

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