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通过颗粒活性炭从反透和纳米过盐水中去除PFAS:热力学见解盐度影响

Jiefei Cao¹, Siyuan Feng², Alireza Arhami Dolatabad¹

¹Department of Civil and Environmental Engineering, University of Missouri, Columbia, MO 65211, United States.

|May 13, 2025

概括

我们研究了从反透/纳米过盐水中去除多和多基物质 (PFAS). 活性炭和离子交换树脂有效地去除了PFAS,但盐度影响了活性炭上的短链PFAS吸附.

科学领域:

环境化学环境化学
水处理技术水处理技术
吸附科学吸附科学

背景情况:

和多醇基物质 (PFAS) 是各种水源中发现的持久污染物.
反透/纳米过 (RO/NF) 过程将PFAS集中到盐水中,需要有效的处理策略.
关于从高盐度RO/NF盐水中去除PFAS的研究存在不足.

研究的目的:

用不同的膜和吸附剂材料评估从RO/NF盐水中去除PFAS.
为了研究盐度对颗粒活性炭 (GAC) 和离子交换 (AIX) 树脂的PFAS吸附的影响.
阐明控制盐度依赖PFAS去除的机制.

主要方法:

对RO/NF膜进行选,以检测PFAS去除效率和流量.
通过批量实验评估GAC和AIX树脂对PFAS从盐水中的吸附.
热力学建模分析盐度对吸附过程的影响.
研究吸附机制,包括疏水,静电和竞争效应.

主要成果:

RO/NF膜显示了可变的PFAS去除;NFX吸附了大量的高硫酸.
GAC和AIX树脂有效地从盐水中去除了中等和长链PFAS.
通过AIX去除短链PFAS是有限的,而GAC吸附因盐度增加而不成比例地减少.
盐度对GAC吸附的影响与竞争性离子吸附和水合效应有关,而不是盐分.

结论:

从RO/NF盐水中有效去除PFAS需要仔细选择处理技术.
盐度显著影响短链PFAS对GAC的吸附,主要是通过除水或静电相互作用以外的机制.
了解盐度依赖吸附对于优化 PFAS 在高离子强度废水中的修复至关重要.

关键词:

膜吸附是一种吸附.在PFAS吸附吸附.对于RO/NF盐来说,这是一个很好的选择.度效应是一种度效应.短链的PFAS是什么意思热力学建模热力学建模

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