多氟烷基物质的官能团对纳米过滤法去除多氟烷基物质的影响

IF 7.2 2区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Takahiro Fujioka , Haruka Takeuchi , Hironobu Tahara , Hiroto Murakami , Sandrine Boivin
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引用次数: 0

摘要

确定纳滤膜去除新出现的污染物(包括多氟烷基物质 (PFAS)、药物和个人护理产品 (PPCP))的可靠性对于确保饮用水安全非常重要。本研究的目的是根据影响 PPCP 去除的因素进行推断,从而明确影响浸没式 NF 处理过程中去除九种主要 PFAS 的因素。随着 PFAS 分子尺寸的增加,在 5 升/平方米小时的低渗透通量条件下,聚哌嗪-酰胺(NF270)膜对超滤大坝水中九种 PFAS 的去除率从 71% 增加到 94%。与带有磺基(-SO3H)的全氟辛烷磺酸相比,带有羧酸(-CO2H)的全氟辛烷磺酸被排斥的程度更高。此外,带负电荷的 PFAS 或 PPCPs 比不带电荷和带正电荷的 PPCPs 被剔除的程度更高。我们的研究结果表明,PFASs 的剔除率会因以下因素而变化:(i) PFASs 分子尺寸与 NF 膜孔径之间的间隙距离;(ii) PFASs 功能基团与 NF 膜表面之间的静电排斥强度。我们的研究表明,浸没式纳滤可以实现较高的 PFAS 阻隔率;然而,由于渗透通量较低,PFAS 阻隔率之间的差异会变得更加突出。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effects of functional groups of polyfluoroalkyl substances on their removal by nanofiltration

Effects of functional groups of polyfluoroalkyl substances on their removal by nanofiltration

Determining the reliability of nanofiltration (NF) membranes for the removal of contaminants of emerging concern, including polyfluoroalkyl substances (PFASs), pharmaceuticals, and personal care products (PPCPs), is important for ensuring drinking water safety. This study aimed to clarify the factors that influence the removal of nine major PFASs during submerged NF treatment via extrapolation based on the factors that influence PPCP removal. The rejection of nine PFASs in ultra-filtered dam water by a polypiperazine-amide (NF270) membrane increased from 71 % to 94 % at a low permeate flux of 5 L/m2 h as the PFAS molecular dimensions increased. PFASs with a carboxylic acid (-CO2H) were rejected to a greater extent than PFASs with a sulfo group (-SO3H). Further, negatively charged PFASs or PPCPs were rejected to a greater extent than uncharged and positively charged PPCPs. Our findings suggest that the rejection of PFASs can vary because of the (i) clearance distance between the PFASs’ molecular dimensions and NF membrane pore diameter and (ii) intensity of electrostatic repulsion between the PFASs’ functional groups and NF membrane surface. Our study indicates that submerged NF can achieve high PFAS rejection; however, variations in rejection among PFASs can become more prominent owing to a low permeate flux.

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来源期刊
Water Research X
Water Research X Environmental Science-Water Science and Technology
CiteScore
12.30
自引率
1.30%
发文量
19
期刊介绍: Water Research X is a sister journal of Water Research, which follows a Gold Open Access model. It focuses on publishing concise, letter-style research papers, visionary perspectives and editorials, as well as mini-reviews on emerging topics. The Journal invites contributions from researchers worldwide on various aspects of the science and technology related to the human impact on the water cycle, water quality, and its global management.
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