光电芬顿氧化反应降解染料罗丹明B（英文）  

Dye Rhodamine B degradation by photo-Electric Fenton's oxidation

作　　者：陈美娟[1,2] 朱威 WONG Yuktung[2] 

机构地区：[1]西安交通大学人居环境与建筑工程学院,西安710049 [2]香港理工大学土木及环境工程学系,香港999077

出　　处：《地球环境学报》2017年第6期586-592,共7页Journal of Earth Environment

基　　金：国家自然科学基金项目(41503102);中国博士后基金(2015M572568);陕西省博士后基金(2016BSHEDZZ35);香港理工大学基金(G-YBHP)~~

摘　　要：以有机染料罗丹明B为目标污染物,利用光电芬顿方法对其进行降解研究。研究汇总考察了芬顿试剂(二价铁盐、双氧水)的用量及比例、初始p H值、电流强度等对罗丹明B降解效果的影响。实验结果表明:芬顿试剂H_2O_2/Fe^(2+)的最佳物质的量比为1∶1,Fe^(2+)浓度降低或H_2O_2浓度升高,罗丹明B降解效果增强;罗丹明B在pH=3.0的酸性体系中降解效果最好;电流强度为0.005 A时,罗丹明B降解效果好且耗能最低。在H_2O_2/Fe^(2+)物质的量比为1∶1、电流为0.005 A、初始pH=3.0、H_2O_2初始浓度为1.0 mM条件下,以350 nm紫外光照射的光电芬顿反应降解初始浓度为0.1 mM的罗丹明B溶液,处理10 min后罗丹明B去除效率可达99%以上。Background, aim, and scope The synthetic dyes is undesirable in water because the coloring agents are harmful to the aquatic environment. Rhodamine B （RhB） is an important representative of xanthene-based dyes. Human exposure to RhB can cause irritation in contact with skin, eyes and respiratory tract. Fenton reaction is proven to be an efcient oxidation process for organic pollutants in previous literatures, due to the fact that ferrous salt is widely available, non-toxic and relative cheap and that the end product is environmentally benign. The hydroxyl radical （？OH） is the active species to degrade target compounds in Fenton reaction. However, the rapid depletion and slow regeneration of ferrous ions throughout the reaction is one of the main drawbacks in classical Fenton process （Fe2＋ ＋ H2O2 → Fe3＋ ＋ OH- ＋ ·OH）. In the photo-Fenton and electro-Fenton process, the catalytic reaction is propagated by Fe（Ⅱ） regeneration to overcome the drawback in classical Fenton process. Materials and methods In this study, a novel electric photo-Fenton process was employed, the Fenton’s reagents of ferrous ions （Fe2＋） and H2O2 were used in the electrochemical cell to produce hydroxyl radicals, the iron steel worked as sacrifcial anode for the generation of supplementary Fe2＋, and Fe2＋ were also regenerated via the reduction of ferric ions by the cathode and UV light. The dye RhB was chosen as a target pollutant to evaluate the performance in aqueous solution. Three types of Fenton reactions （i.e. sole-Fenton, photo-Fenton and electro photo-Fenton） were studied and compared. The effect parameters such as pH, hydrogen peroxide concentration, ferrous ion dosage, and electric current were evaluated and optimized. Results Three types of Fenton processes （i.e. sole-Fenton, photo-Fenton and electro photo-Fenton） were conducted to identify the RhB degradation efciency. The electro photo-Fenton shows best performance to RhB degradation. Meanwhile, in the electro photo-Fenton proces

关 键 词：光电芬顿 罗丹明B 影响参数 降解效果 

分 类 号：X703[环境科学与工程—环境工程]