光电催化结合氧化降解碱性品红的研究

DEGRADATION OF BASIC VIOLET BY PHOTO-ELECTROCHEMICAL CATALYTIC OXIATION

用UV/TiO_2悬浮液光催化氧化和间接电氧化相结合的方法降解碱性品红考察了NaCl浓度、电流密度、pH值对光电催化结合降解碱性品红速率的影响结果表明光电催化结合比单一光催化降解效果有了明显的提高;NaCl浓度对光电催化结合的降解速率没有明显影响;提高电流密度可以增加光电催化结合的降解速率,但会减少单位电流密度下碱性品红的降解量;pH=900时,光电催化结合的降解速率最大.光电催化结合氧化降解1600min后溶液脱色率达100%,COD去除率达755%

Degradation of baisc violet was investigated by a new photoelectrocatalytic oxidation method—~photocatalytic oxidation in UV/TiO_~2 suspensions system combined with indirect electro-oxidation.In this study, the degradation efficiency of basic violet in photoelectrocatalytic oxidation system and that in sole photocatalytic oxidation system were contrasted; the effect of concentration of NaCl, the current density, pH on the degradation rate of basic violet in photoelectrocatalytic oxidation system were investigatd. The experimental results showed that the degradation efficiency of basic violet in photoelectrocatalytic oxidation system was much higher than that in sole photocatalytic oxidation system; In the photoelectrocatalytic oxidation system,the concentration of NaCl had little effect on the degradation rate of basic violet; A higher current density resulted in a faster degradation rate but a smaller degradation amount per unit of current density; pH value exerted some influence on degradation rate of basic violet, the degradation rate of basic violet followed the order: pH11.0≈9.0﹥7.0﹥5.0﹥3.0. After 160.0min of treatment the decolorization rate and COD removal rate of solution were 100% and 75.5% respectively.