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Electrochemically Assisted Persulfate Oxidation of Organic Pollutants in Aqueous Solution: Influences, Mechanisms and Feasibility
oleh: Jianting Sun, Wei Zheng, Gang Hu, Fan Liu, Siyuan Liu, Lie Yang, Zulin Zhang
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2023-01-01 |
Deskripsi
Electrochemically (EC) assisted persulfate (PS) oxidation processes (EPOPs) have gained increasing attention in recent years. In this review, the current status and prospects of EC/PS degradation of organic pollutants are discussed and summarized. It was found that the oxidation of most organic contaminants could be significantly enhanced or accelerated using the combination of EC and PS compared to single treatments. Moreover, the effects of various operational variables on the removal of organic contaminants were investigated. Some variables are highly sensitive, and the optimal conditions are case-specific. Regarding the degradation mechanisms, radical-induced reactions and nonradical reactions both exist for the elimination of organic contaminants. Oxidants (including S<sub>2</sub>O<sub>8</sub><sup>2−</sup> and SO<sub>4</sub><sup>•−</sup>) can be produced from SO<sub>4</sub><sup>2−</sup> near the anode, which is a unique feature of EPOPs. In some studies, the electrical energy consumption of EPOPs has been controlled to a reasonably low level in lab-scale attempts. Although there are still a few drawbacks or difficulties (e.g., potential electrode fouling, dependency on batch mode) for large-scale applications, EPOPs offer a promising alternative to traditional advanced oxidation techniques.