Institute of Environmental Engineering, National Chiao Tung University, Hsin-Chu, Taiwan.
Department of Civil and Environmental Engineering, University of Delaware, Newark, DE, USA.
Sci Total Environ. 2019 Apr 1;659:221-229. doi: 10.1016/j.scitotenv.2018.12.224. Epub 2018 Dec 20.
A dual-anode consists of stainless steel and TiO/Ti electrodes is used to study the kinetics of the degradation of hazardous chemicals exemplified by azo dye orange G (OG) using a coupling photoelectrochemical catalytic and photoelectro-Fenton (PEC/PEF) system. Concurrent generation of hydroxyl radicals on the TiO/Ti photocatalyst and in-situ generation of Fenton reagents on the stainless steel electrode greatly enhances the performance of the PEC/PEF electrodes over that of the PEC and the PEF alone process. The efficiency of the PEC/PEF process is a function of Fe and HO concentration OH⋅ in the solution bulk, which promotes the oxidative degradation of OG and its byproducts. The mean carbon oxidation state (COS) is estimated to reflect the degree of mineralization. Based on the pseudo first-order kinetics with respect to OH, OG, Fe, the corresponding reaction rates is established. UV-Vis spectrometry reveals the presence of four major intermediates, which helps establish the OG degradation pathways.
双阳极由不锈钢和 TiO/Ti 电极组成，用于研究偶氮染料橙 G (OG) 等有害化学物质的降解动力学，使用耦合光电化学催化和光芬顿（PEC/PEF）系统。TiO/Ti 光催化剂上同时生成羟基自由基和不锈钢电极上原位生成芬顿试剂，极大地提高了 PEC/PEF 电极的性能，超过了单独的 PEC 和 PEF 工艺。PEC/PEF 工艺的效率是溶液本体中 Fe 和 HO 浓度 OH⋅ 的函数，这促进了 OG 和其副产物的氧化降解。平均碳氧化态 (COS) 用于反映矿化程度。基于对 OH、OG、Fe 的拟一级动力学，建立了相应的反应速率。UV-Vis 光谱法揭示了存在四种主要中间体，这有助于建立 OG 降解途径。
