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物化作用氧化降解PFOA/PFOS
Oxidative Degradation of PFOA/PFOS with Physicochemical Techniques
全氟辛/磺酸（PFOX）具有环境持久、耐氧化、抗常规化学处理的特点。目前，针对PFOX的有效去除工艺研究已成为环境技术领域有机污染物降解方向的新热点。近年来，一些强氧化工艺被开发用于降解PFOX，主要通过各种物理作用增强化学氧化能力，实现PFOX的有效降解。本文综述了纯化学过程以及光、电、热、声、等离子体、微波、机械力等物理作用促进化学氧化降解PFOX的反应机理、降解途径和各因素的影响机制，以及去除效率和能耗等，介绍了该方向的最新研究进展，讨论分析了这些技术存在的问题，并提出了今后技术应用的重点研究方向。
Perfluorooctanoate and perfluoroctanesulfonate (PFOX) are environmentally persistent, recalcitrant to oxidation, and resistant to conventional chemical treatments. The related studies on the exploration and establishment of the effective removal techniques for PFOX have become the new hotspot to the degradation of organic pollutants in the field of environmental technology. Recently, highly active oxidation methods for the efficient degradation of PFOX were developed through the promotion effect of various physical processes on the oxidation ability of conventional chemical methods. So this paper reviews the concerned reports which employed the single chemical oxidation approach and the coupling techniques of physical processes and chemical oxidation for the removal of PFOX. The coupling effects of physical methods and chemical oxidation processes can result in photolysis, electrolysis, pyrolysis, sonolysis, plasma-induced oxidation, microwave-induced oxidation, or mechanochemistry destruction of PFOX. For each coupling physicochemical techniques, the mechanism of the oxidative reaction, the detailed degradation pathway of PFOX, the effect of various influential factors on reaction process as well as the removal efficiency and energy consumption are summarized in this paper. It is also introduced for the progress on these above studies and further discussion about current problems for these techniques. In addition, the future trends for the development of these techniques to PFOX degradation are prospected for their practicality.
Contents
1 Introduction
2 PFOX oxidation only by chemical reagents
3 Oxidative degradation of PFOX by various physicochemical processes
3.1 PFOX degradation by photochemistry
3.2 PFOX degradation by electrochemistry
3.3 PFOX degradation by thermochemistry
3.3.1 High-temperature pyrolysis
3.3.2 Ultrasonic pyrolysis
3.4 PFOX degradation by plasma
3.5 Microwave-assisted PFOX degradation
3.5 PFOX degradation by mechanochemistry
4 Conclusions and prospects
perfluorooctanoate (PFOA)
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