Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410007, China.
Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China.
Chemosphere. 2022 Apr;292:133470. doi: 10.1016/j.chemosphere.2021.133470. Epub 2021 Dec 29.
A flow-through system was constructed for 2,4-dichlorophenoxyacetic acid (2,4-D) degradation for the first time using efficient boron and cobalt co-doped TiO nanotubes (B, Co-TNT) as the anode and carbon black doped carbon felt (CB-CF) that had a high HO yield as the cathode. Compared with dimensionally stable anode (DSA), whether in anodic oxidation (AO) or AO-electro-Fenton (EF) system, 2,4-D degradation in B, Co-TNT anode system was more efficient accompanying with a lower energy consumption (Ec). Different operating parameters including applied current density, initial pH and flow rate were explored, supporting that the optimal Fe dosage was 0.5 mM while decreasing the initial pH and increasing the current intensity and flow rate were beneficial to 2,4-D removal. In this AO-EF system, the involved mechanisms for 2,4-D degradation were anodization and Fenton oxidation, possessing the comprehensive effect of OH and SO with their contribution of 92.7% and 4.8%, respectively. This flow-through AO-EF system performed a stable performance, and an efficient degradation performance with low Ec (5.8-29.5 kWh (kg TOC)) was obtained for different kinds of contaminants (methylene blue, phenol, p-nitrophenol and sulfamethazine). Therefore, B, Co-TNT anode coupled with CB-CF cathode in flow-through system was effective for contaminants degradation.
首次构建了一个流动体系，用于 2,4-二氯苯氧乙酸（2,4-D）的降解，该体系使用高效的硼和钴共掺杂 TiO 纳米管（B、Co-TNT）作为阳极，碳黑掺杂碳毡（CB-CF）作为阴极，该阴极具有高的 HO 产率。与尺寸稳定阳极（DSA）相比，无论是在阳极氧化（AO）还是 AO-电芬顿（EF）体系中，B、Co-TNT 阳极体系中 2,4-D 的降解效率更高，同时能耗（Ec）更低。探索了不同的操作参数，包括施加的电流密度、初始 pH 值和流速，结果表明最佳的 Fe 用量为 0.5 mM，而降低初始 pH 值、增加电流强度和流速有利于 2,4-D 的去除。在该 AO-EF 体系中，2,4-D 的降解涉及阳极氧化和芬顿氧化机制，具有 OH 和 SO 的综合作用，其贡献分别为 92.7%和 4.8%。该流动 AO-EF 体系具有稳定的性能，对于不同类型的污染物（亚甲基蓝、苯酚、对硝基苯酚和磺胺嘧啶），获得了低 Ec（5.8-29.5 kWh（kg TOC））的高效降解性能。因此，B、Co-TNT 阳极与 CB-CF 阴极在流动体系中的结合对于污染物的降解是有效的。
