A dual TiO2/Ti-stainless steel anode for the degradation of orange G in a coupling photoelectrochemical and photo-electro-Fenton system

被引：44

作者：

Liu, Ching-Fang ^{[1
]}

Huang, C. P. ^{[2
]}

Hu, Chi-Chang ^{[3
]}

Huang, Chihpin ^{[1
]}

机构：

[1] Natl Chiao Tung Univ, Inst Environm Engn, Hsinchu, Taiwan

[2] Univ Delaware, Dept Civil & Environm Engn, Newark, DE USA

[3] Natl Tsing Hua Univ, Dept Chem Engn, Hsinchu, Taiwan

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2019年 / 659卷

关键词：

Photoelectrochemical catalytic oxidation; Photoelectro-Fenton; Orange G; Electro-Fenton; Electrochemical oxidation; PHOTOELECTROCATALYTIC DEGRADATION; PHOTOCATALYTIC DEGRADATION; AQUEOUS-SOLUTION; OXIDATION; MINERALIZATION; 2,4-DICHLOROPHENOL; DECOLORIZATION; KINETICS; REMOVAL; REACTOR;

D O I：

10.1016/j.scitotenv.2018.12.224

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A dual-anode consists of stainless steel and TiO2/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 TiO2/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 Fe2+ and H2O2 concentration OH center dot 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 center dot, OG, Fe2+, the corresponding reaction rates is established. UV-Vis spectrometry reveals the presence of four major intermediates, which helps establish the OG degradation pathways. (c) 2018 Elsevier B.V. All rights reserved.

引用

页码：221 / 229

页数：9