基于过硫酸盐活化的微界面电子转移氧化技术
Micro-Interface Electron Transfer Oxidation Based on Persulfate Activation
基于过硫酸盐活化的高级氧化技术是当前环境领域的研究热点。然而,环境中广泛存在的基质严重地制约了这一技术的实际应用。最新研究表明,在某些催化剂的作用下,过硫酸盐能够以电子转移的非自由基机制氧化降解污染物,而催化剂主要起电子转移媒介的作用。这一技术不易受水环境中氯离子、碳酸氢根离子等常见阴离子和天然有机物的影响,对目标污染物的氧化去除具有较高的选择性。同时,实验现象初步显示这一技术有望实现污染物的降解而无须使其与氧化剂直接接触,从而能够避免氧化剂和卤素阴离子的作用。本文着重综述了常见电子媒介的类型、电子转移机制的表征方法和常见基质对电子转移过程的影响,提出了这一技术存在的问题并对其应用前景进行了展望。
Advanced oxidation processes based on persulfate activation have attracted increasing attention in the field of environmental remediation. However, the ubiquitous presence of radical scavengers in the environment limits the practical application of this technology. The latest publications show that the persulfate, under the activation of certain catalysts, can oxidize contaminants through the non-radical mechanism of electron transfer, and the catalyst mainly serves as an electron shuttle. This technology is not easily affected by common anions, such as chloride ions and bicarbonate ions, and natural organic matters and has high selectivity for the oxidation of target contaminants. Meanwhile, this technology may degrade pollutants without the need of direct contact between oxidants and pollutants, thereby avoiding the generation of toxic halogenated products due to the direct interaction between halogen ions and persulfate. This review mainly summarizes the types of common electron shuttles, the characterization methods of electron transfer processes, and the effects of common water components. Finally, the problems and application potential of this technology are proposed.
Contents:
1 Introduction
2 Mechanism and categories of interfacial electron transfer oxidation
2.1 Development and mechanism of interfacial electron transfer
2.2 Types of electron shuttles
2.3 Advantages and disadvantages of different electron shuttles
3 Identification of electron transfer mechanism
3.1 Radical measurements
3.2 Involvement of nonradical species
3.3 Electrochemical tests
3.4 Decomposition of persulfates
3.5 Theoretical calculation
4 Influencing factors of interfacial electron transfer
4.1 Factors influencing the catalytic reactivity
4.2 Factors influencing the adsorption reactivity
5 Effects of common water components
5.1 Chloride ions
5.2 Carbonate and bicarbonate ions
5.3 Natural organic matters
5.4 Treatment of wastewate by electron transfer
6 Applications of interfacial electron transfer
7 Conclusions and outlook
过硫酸盐 / 电子转移 / 微污染物 / 氧化降解 / 选择性氧化 / 基质效应
persulfate / electron transfer / microcontaminants / oxidative degradation / selective oxidation / matrix effects
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国家自然科学基金项目(42077340)
国家自然科学基金项目(52000080)
广东省基础与应用基础研究基金(2019A1515110988)
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