Deng Fengxia, Olvera-Vargas Hugo, Zhou Minghua, Qiu Shan, Sirés Ignasi, Brillas Enric
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, P. R. China.
Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament de Ciència de Materials i Química Física, Secció de Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain.
Chem Rev. 2023 Apr 26;123(8):4635-4662. doi: 10.1021/acs.chemrev.2c00684. Epub 2023 Mar 14.
This review presents an exhaustive overview on the mechanisms of Fe cathodic reduction within the context of the electro-Fenton (EF) process. Different strategies developed to improve the reduction rate are discussed, dividing them into two categories that regard the mechanistic feature that is promoted: electron transfer control and mass transport control. Boosting the Fe conversion to Fe via electron transfer control includes: (i) the formation of a series of active sites in both carbon- and metal-based materials and (ii) the use of other emerging strategies such as single-atom catalysis or confinement effects. Concerning the enhancement of Fe regeneration by mass transport control, the main routes involve the application of magnetic fields, pulse electrolysis, interfacial Joule heating effects, and photoirradiation. Finally, challenges are singled out, and future prospects are described. This review aims to clarify the Fe/Fe cycling process in the EF process, eventually providing essential ideas for smart design of highly effective systems for wastewater treatment and valorization at an industrial scale.
本综述对电芬顿（EF）过程中铁阴极还原的机制进行了详尽概述。讨论了为提高还原速率而开发的不同策略，将其分为两类，这两类策略分别基于所促进的机理特征：电子转移控制和传质控制。通过电子转移控制提高铁向亚铁的转化率包括：（i）在碳基和金属基材料中形成一系列活性位点，以及（ii）使用其他新兴策略，如单原子催化或限域效应。关于通过传质控制增强亚铁再生，主要途径包括施加磁场、脉冲电解、界面焦耳热效应和光辐照。最后，指出了挑战，并描述了未来前景。本综述旨在阐明EF过程中的铁/亚铁循环过程，最终为工业规模的高效废水处理和增值系统的智能设计提供基本思路。
