Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
J Hazard Mater. 2021 Aug 15;416:125859. doi: 10.1016/j.jhazmat.2021.125859. Epub 2021 Apr 20.
Heterogeneous electro-Fenton (e-Fenton) is a promising technology for the treatment of persistent organic pollutants, in which HO is produced via 2e oxygen reduction and is simultaneously activated into •OH by the iron-based catalyst. This system often suffers from the inevitable metal dissolution in the acidic or even neutral environment, leading to poor pH adaptation and low stability. In this work, we designed a metal-free e-Fenton system, using O-doped carbon nanotubes (OCNTs) as the bifunctional metal-free cathode for the degradation of organic pollutants. The system showed the excellent e-Fenton performance under neutral conditions with the phenol degradation kinetic constant of 0.071 min, and the corresponding TOC removal was 76.6% within 300 min. It also exhibited excellent performance for actual coking wastewater treatment with the specific energy consumption of 7.4 kW h kg COD, which was lower than that reported heterogeneous electro-Fenton system (9.2-14.4 kW h kg COD). The in-situ metal-free e-Fenton system could be regarded as a promising strategy for actual wastewater treatment.
非均相电芬顿（e-Fenton）是一种很有前途的处理持久性有机污染物的技术，其中 HO 通过 2e 氧气还原产生，并同时被基于铁的催化剂激活成 •OH。该系统在酸性甚至中性环境中常常受到不可避免的金属溶解的影响，导致 pH 适应性差和稳定性低。在这项工作中，我们设计了一种无金属的 e-Fenton 系统，使用掺杂氧的碳纳米管（OCNTs）作为双功能无金属阴极来降解有机污染物。该系统在中性条件下表现出优异的 e-Fenton 性能，苯酚降解动力学常数为 0.071 min，在 300 min 内对应的 TOC 去除率为 76.6%。它还表现出对实际焦化废水处理的优异性能，具体能耗为 7.4 kW h kg COD，低于报道的非均相电芬顿系统（9.2-14.4 kW h kg COD）。原位无金属 e-Fenton 系统可以被视为实际废水处理的一种很有前途的策略。
