Abstract

Over the last few years, new advanced oxidation processes (AOPs) have been developed to the removal of organic pollutants from waters and wastewaters. The effectiveness of these AOPs as powerful way for the removal of POPs is related to the in situ production of strong oxidative species such as the hydroxyl radicals (·OH). Among the techniques involving AOPs, photo-electrocatalysis (PEC) has come out as a powerful AOP consisting of the combination of both photocatalytic and electrocatalytic processes for the objective to retard and/or avoid the fast recombination of the formed electron/hole pairs during the PEC. This can be achieved by the extraction of the photogenerated electrons directed to the cathode when an external bias potential is applied to the photoanode. This general and critical review deals with the application of PEC to the remediation of organic pollutants from wastewaters (i.e. dyeing effluents) using phosphate-based photoanodes namely BiPO₄, Ag₃PO₄, Cu₂(OH)PO₄ and others. A detailed description of the PEC power of different photoanode has been discussed. The fundamentals and main applications of photo-electrochemical oxidation are reported. Finally, some critiques are proposed in order to improve and develop new effective photoanodes with perspectives to industrial applications.

Graphic abstract

中文翻译：

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磷酸盐基材料催化的含有机物废水的光电化学降解：综述

摘要

在过去的几年中，已经开发了新的高级氧化工艺（AOP）来去除水和废水中的有机污染物。这些AOP作为去除POP的有效方法的有效性与原位产生强氧化性物质（例如羟基自由基（·OH））有关。在涉及AOP的技术中，光电催化（PEC）作为强大的AOP出现了，它由光催化和电催化过程的组合组成，目的是在合成过程中延迟和/或避免形成的电子/空穴对的快速重组。 PEC。当外部偏置电势施加到光电阳极时，可以通过提取定向到阴极的光生电子来实现。₄，Ag ₃ PO ₄，Cu ₂（OH）PO ₄等。已经讨论了不同光电阳极的PEC功率的详细描述。报道了光电化学氧化的基本原理和主要应用。最后，从工业应用的角度出发，提出了一些评论意见，以改进和开发新的有效光阳极。

图形摘要