Efficient separation of per- and polyfluoroalkyl substances (PFAS) from water by aminated polyacrylamide hydrogel foam

IF 13.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Chemical Engineering Journal Pub Date : 2024-11-20 DOI:10.1016/j.cej.2024.157833

Yichen Xu, Xueru Yu, Xinhao Wang, Yiqian Song, Wenran Wang, Ming Zhang, Deyang Kong, Zhanghao Chen, Cheng Gu

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引用次数: 0

Abstract

Emerging per- and polyfluoroalkyl substances (PFAS) are highly toxic chemicals with extraodinary stability in the aquatic environment. Highly efficient adsorbents are in urgent need to address the environmental challenges caused by PFAS. Herein, we developed a novel aminated foam adsorbent with high affinity for PFAS adsorption through polymerization, amination and pyrolyzation. For initial 1 μg/L perfluorooctanoic acid (PFOA) solution, more than 97.9 % removal efficiency could be obatined with a rapid equilibration time of ∼ 15 min. The elevated adsorption efficiency could be explained by the synergetic effect of electrostatic/hydrogen bonding and hydrophobic interaction, while the increase of specific surface area (SSA) also has a positive effect on PFOA adsorption. Furthermore, the sythesized polyacrylamide-polyaniline material (pyrolyzed at 301℃, PAM-PANI-2) exhibited high adaptability to different environmental influencing factors, including pH and co-existed organic matters, and presented excellent adsorption removal ability for other common PFAS except for PFOA. Moreover, it is worth noting that this foam material has advantages in regeneration compared to traditional powder adsorbents, without complicated procedures such as centrifugation and filtration. These results indicate that aminated PAM polymers are promising adsorbents in remediations of trace PFAS-contaminated water, which can give new insights to the design and application of novel polymer materials of PFAS treatments.

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利用胺化聚丙烯酰胺水凝胶泡沫从水中高效分离全氟和多氟烷基物质 (PFAS)

新出现的全氟和多氟烷基物质（PFAS）是剧毒化学品，在水生环境中具有超常稳定性。为应对 PFAS 带来的环境挑战，迫切需要高效吸附剂。在此，我们通过聚合、胺化和热解，开发了一种对 PFAS 具有高吸附亲和力的新型胺化泡沫吸附剂。对于初始浓度为 1 μg/L 的全氟辛酸（PFOA）溶液，在 15 分钟的快速平衡时间内，吸附效率超过 97.9%。吸附效率的提高可能是由于静电/氢键和疏水作用的协同效应，而比表面积（SSA）的增加也对 PFOA 的吸附产生了积极影响。此外，制备的聚丙烯酰胺-聚苯胺材料（301℃热解，PAM-PANI-2）对不同的环境影响因素（包括 pH 值和共存有机物）具有很强的适应性，除 PFOA 外，对其他常见的 PFAS 具有很好的吸附去除能力。此外，值得注意的是，与传统的粉末吸附剂相比，这种泡沫材料具有再生优势，无需离心和过滤等复杂程序。这些结果表明，胺化 PAM 聚合物在痕量 PFAS 污染水的修复中是一种很有前景的吸附剂，可为设计和应用新型聚合物材料处理 PFAS 提供新的思路。

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来源期刊

Chemical Engineering Journal 工程技术-工程：化工

CiteScore

21.70

自引率

9.30%

发文量

6781

审稿时长

2.4 months

期刊介绍： The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.