聚电解质功能化超滤膜对全氟辛烷磺酸和全氟辛酸的强化去除:膜改性和水基质的影响

IF 6.6 Q1 ENGINEERING, ENVIRONMENTAL Journal of hazardous materials letters Pub Date : 2021-11-01 DOI:10.1016/j.hazl.2021.100043
Kunal Olimattel , Lei Zhai , A.H.M. Anwar Sadmani
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引用次数: 12

摘要

研究了聚电解质(PE)功能化超滤(UF)膜去除全氟辛烷磺酸(PFOS)和全氟辛烷酸(PFOA)的机理,采用逐层(LbL)沉积聚烯丙胺盐酸盐(PAH)和聚丙烯酸(PAA)多层涂层的流态化方法。考察了水源水组成(腐植酸[HA]和阳离子[Ca2+和Mg2+])对PFOS和功能化膜去除PFOA效率的影响。PAH/PAA改性后,膜的分子量(MWCO)和孔隙率分别降低了约38%和9.2%,PFOS和PFOA的去除率增加了约30%,这主要是由于尺寸的排除。与去离子水相比,仅HA的存在可使全氟辛烷磺酸/A的去除率提高10 - 12%;然而,HA浓度的增加并没有进一步影响它们的去除率。阳离子和透明质酸共存导致全氟辛烷磺酸和全氟辛酸的去除率显著提高(全氟辛烷磺酸的去除率最高可提高23%)。由于PFOS/A与源水组分和功能化膜的相互作用,导致PFOS-阳离子-PFOS、PFOS-阳离子- ha和pfoa -阳离子- ha等大分子复合物的尺寸增大和电荷排除,当阳离子浓度增加一倍时,PFOS去除率进一步提高(提高14%)。
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Enhanced removal of perfluorooctane sulfonic acid and perfluorooctanoic acid via polyelectrolyte functionalized ultrafiltration membrane: Effects of membrane modification and water matrix

This study investigated the mechanisms of removal of perfluorooctane sulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) using polyelectrolyte (PE) functionalized ultrafiltration (UF) membranes, performed through a fluidic method of layer-by-layer (LbL) deposition of polyallylamine hydrochloride (PAH) and polyacrylic acid (PAA) multilayer coatings. The effects of source water composition (humic acids [HA] and cations [Ca2+ and Mg2+]) on PFOS and PFOA removal efficiency by the functionalized membrane were determined. PAH/PAA modification resulted in approximately 38 % and 9.2 % reduction in membrane molecular weight cut-off (MWCO) and porosity, respectively, leading to approximately 30 % increase in the removal of PFOS and PFOA primarily due to size exclusion. The presence of only HA led to 10–12 % higher removal of PFOS/A when compared to DI water; however, an increase in HA concentration did not further influence their removal efficiency. The coexistence of cations and HA resulted in significantly higher removal of PFOS and PFOA (up to 23 % higher for PFOS). Further enhancement of PFOS removal (14 % higher) was observed when cation concentrations were doubled, attributable to the interactions of PFOS/A with the source water components and the functionalized membrane, resulting in enhanced size and charge exclusion of macromolecular complexes including PFOS-cation-PFOS, PFOS-cation-HA, and PFOA-cation-HA.

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来源期刊
Journal of hazardous materials letters
Journal of hazardous materials letters Pollution, Health, Toxicology and Mutagenesis, Environmental Chemistry, Waste Management and Disposal, Environmental Engineering
CiteScore
10.30
自引率
0.00%
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0
审稿时长
20 days
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