三维电极电助光催化降解直接湖蓝水溶液的研究

 以500W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66．7％．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．

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

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 decolorization 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.