三维电极电助光催化降解直接湖蓝水溶液的研究  

Electrically Assisted Photocatalytic Degradation of Direct Sky Blue Aqueous Solution with Three-Dimensional Electrodes

作　　者：安太成[1] 何春[1] 朱锡海[1] 顾浩飞[1] 陈卫国[1] 熊亚[1] 

机构地区：[1]中山大学化学与化学工程学院,广州510275

出　　处：《催化学报》2001年第2期193-197,共5页

基　　金：国家自然科学基金!资助项目 ( 2 99770 3 0 ) ;广东省自然科学基金!资助项目 ( 990 2 74);广东省环保局科技研究开发项目 !( 1999 14

摘　　要：以 5 0 0W高压汞灯为光源 ,在TiO2 光催化剂和电催化剂同时存在下 ,联合多相三维电极技术与光催化技术 ,对直接湖蓝 5B水溶液进行了电助光催化降解的研究 .实验结果表明 ,浓度为 0 .5mmol/L的直接湖蓝 5B水溶液经 30min的光电催化降解 ,其大环结构可迅速破坏 ,颜色可迅速褪去 ,色度去除率高达 96 .8% ,COD去除率可达6 6 .7% .考察了空气流速、光催化剂加入量、底物的初始浓度、电解槽电压、pH值、电导率、以及曝气量等因素对直接湖蓝 5B脱色率及COD去除率的影响 .Present study was to report electrically assisted photocatalytic degradation of direct sky blue aqueous solution by three-phase three-dimensional electrodes. By illuminating with 500 W high pressure mercury lamp and initiating with 30 voltage direct current, a decolorization ratio of higher than 96. 8 % and COD concentration reduction of about 66. 7 % were observed during a period of 30 min in the presence of both photocatalyst and filler electrodes. Compared with these values, the lower docolorization ratios and COD removal obtained by a single application of photochemical (77. 3 % and 50. 6 %) and electrochemical process (88. 6 % and 62. 3 %), respectively. Variety of operating conditions, such as conductivity, cell voltage, pH value, initial concentration of substrate, air-flow and concentration of photocatalyst, was discussed in detail to ascertain their respective effect on the treatment efficiency. The reaction mechanism also was discussed in the system of electrically assisted photocatalytic degradation with three-dimensional electrodes.

关 键 词：电助光催化 三维电极 直接湖蓝5B 偶氮染料 光催化降解 二氧化钛催化剂 脱色率 有机污染物 治理 

分 类 号：O643[理学—物理化学] O644[理学—化学]