人体净化
氧化剂
化学
危险废物
废水
催化作用
吸附
高级氧化法
环境科学
生化工程
环境化学
废物管理
环境工程
有机化学
工程类
作者
Zahra Heidari,Rasool Pelalak,Minghua Zhou
标识
DOI:10.1016/j.cej.2023.145741
摘要
One of the greatest engineering challenges of this century is development of new technologies for removing emerging hazardous contaminants from water sources. Electro-Fenton (EF) as one of the most promising approaches of advanced oxidation processes (AOPs) has received widespread attention for its excellent performance in the removal of recalcitrant pollutants due to generation of strong oxidizing species like hydroxyl radicals (OH). However, the practical application of classical homogeneous EF process is hampered by a narrow pH range (2–4) and production of sludge at higher pH values. The information obtained so far highlights the need to enhance the removal efficiency and reduce the reaction time of EF process under neutral pH conditions. Herein, this review summarizes efficient approaches in recent years (2017–2023) applied in EF system with the aim of overcoming the low pH implementation barrier, such as application of heterogeneous catalysts in EF process (HEF), cathode modifications, using chelating agents, and hybridizing the EF with other treatment methods, including adsorption, membrane, and photo/catalysis. These strategies can accelerate the iron cycle and Fe3+ reduction; therefore, more H2O2 and OH can be generated. Promoting the H2O2 utilization efficiency can provide more oxidative species, which leads to higher degradation and mineralization of contaminant. On the other hand, some strategies by preventing the Fe3+ precipitation at higher pH values help the system work in a wider pH range. In the final section, the challenges of these plans are discussed and perspectives for future research are proposed to improve the practicability and feasibility of the EF for wastewater treatment.
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