School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China E-mail:
Water Sci Technol. 2022 Aug;86(4):847-860. doi: 10.2166/wst.2022.230.
The cathode material is critical to the yield of hydrogen peroxide (HO) and electro-Fenton (EF) performance. In this work, bismuth oxychloride (BiOCl) as one of the representatives of ternary oxides was grown in situ on carbon felt (CF) through a simple solvothermal method and employed directly as a self-standing cathode for the EF degradation of the target contaminant tetracycline (TC). TC can be almost completely degraded, up to 95% in 90 min under the heterogeneous EF process. The characterizations demonstrated that the BiOCl/CF electrode exhibited excellent conductivity due to CF as the supporting carbon material with a 3D network structure; meanwhile, this hybrid electrode also possessed abundant active sites attributed to the decorated BiOCl having rich oxygen defects. Finally, the rational reaction mechanism of TC was also elucidated by the X-ray photoelectron spectroscopy (XPS) spectrum, free radical quenching experiments and electron paramagnetic resonance (EPR) spectra, in which hydroxyl radicals (ċ OH) were considered as the dominant active oxidants and BiOCl had a synergistic effect on in-situ generation and decomposition of HO.
阴极材料对过氧化氢（HO）的产率和电芬顿（EF）性能至关重要。在这项工作中，通过简单的溶剂热法将三价氧化物的代表之一——氯氧化铋（BiOCl）原位生长在碳纤维毡（CF）上，并直接用作目标污染物四环素（TC）的 EF 降解的自支撑阴极。在非均相 EF 过程中，TC 在 90 分钟内几乎可以完全降解，达到 95%。表征表明，BiOCl/CF 电极由于 CF 作为具有 3D 网络结构的支撑碳材料而表现出优异的导电性；同时，由于负载的 BiOCl 具有丰富的氧缺陷，该混合电极还具有丰富的活性位点。最后，通过 X 射线光电子能谱（XPS）谱、自由基猝灭实验和电子顺磁共振（EPR）谱阐明了 TC 的合理反应机制，其中羟基自由基（ċ OH）被认为是主要的活性氧化剂，BiOCl 对 HO 的原位生成和分解具有协同作用。
