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在环境修复中生成和工程应用硫酸根自由基。

Generation and engineering applications of sulfate radicals in environmental remediation.

机构信息

College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China.

College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China; Academy of Environmental and Resource Sciences, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong, 525000, China; School of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang, Jiangxi, 330063, China.

出版信息

Chemosphere. 2023 Oct;339:139659. doi: 10.1016/j.chemosphere.2023.139659. Epub 2023 Jul 26.

Abstract

Sulfate radical (SO)-based advanced oxidation processes (AOPs) have become promising alternatives in environmental remediation due to the higher redox potential (2.6-3.1 V) and longer half-life period (30-40 μs) of sulfate radicals compared with many other radicals such as hydroxyl radicals (•OH). The generation and mechanisms of SO and the applications of SO-AOPs have been examined extensively, while those using sulfite as activation precursor and their comparisons among various activation precursors have rarely reviewed comprehensively. In this article, the latest progresses in SO-AOPs were comprehensively reviewed and commented on. First of all, the generation of SO was summarized via the two activation methods using various oxidant precursors, and the generation mechanisms were also presented, which provides a reference for guiding researchers to better select two precursors. Secondly, the reaction mechanisms of SO were reviewed for organic pollutant degradation, and the reactivity was systematically compared between SO and •OH. Thirdly, methods for SO detection were reviewed which include quantitative and qualitative ones, over which current controversies were discussed. Fourthly, the applications of SO-AOPs in various environmental remediation were summarized, and the advantages, challenges, and prospects were also commented. At last, future research needs for SO-AOPs were also proposed consequently. This review could lead to better understanding and applications of SO-AOPs in environmental remediations.

摘要

基于硫酸根自由基(SO)的高级氧化工艺(AOPs)由于其氧化还原电位(2.6-3.1 V)高于许多其他自由基(如羟基自由基(•OH)),半衰期(30-40 μs)较长,因此在环境修复中成为有前途的替代方法。SO 的产生和机制以及 SO-AOPs 的应用已经得到了广泛的研究,而使用亚硫酸盐作为活化前体及其与各种活化前体之间的比较则很少得到全面综述。本文全面回顾和评论了 SO-AOPs 的最新进展。首先,通过使用各种氧化剂前体的两种活化方法总结了 SO 的产生,并提出了产生机制,这为指导研究人员更好地选择两种前体提供了参考。其次,综述了 SO 对有机污染物降解的反应机制,并系统比较了 SO 和•OH 之间的反应活性。第三,综述了 SO 的检测方法,包括定量和定性方法,并对当前的争议进行了讨论。第四,总结了 SO-AOPs 在各种环境修复中的应用,并对其优点、挑战和前景进行了评论。最后,提出了 SO-AOPs 的未来研究需求。本综述可以促进对 SO-AOPs 在环境修复中的更好理解和应用。

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