摘要
研究用UV/TiO2悬浮液光催化氧化和间接电氧化相结合的方法降解一种模型有机污染物———碱性品红.在TiO2悬浮液中引入间接电氧化技术,在紫外光照的同时,利用电化学反应分别在阴阳极上生成H2O2和HClO.一方面它们可以作为氧化剂直接氧化有机物,另一方面它们可以用做电子受体去提高光催化效率.比较了光电结合催化和单一光催化的降解效果,考察了NaCl浓度、电解电流密度、pH值对光电结合催化降解效果的影响.实验结果表明:光电结合催化比单一光催化降解效果有了明显的提高;NaCl浓度对光电结合催化降解效果没有明显的影响;增加电解电流密度对光电结合催化降解有促进作用;碱性条件下降解效果优于酸、中性条件.
Degradation of baisc violet was investigated by a new photoelectrocatalytic oxidation method — photocatalytic oxidation in UV/TiO2 suspensions system combined with indirect electro-oxidation. During the course of UV irradiating on TiO2 suspensions, electrochemical method was used to produce H2O2 on the cathode and HClO on the anode. Both of them could degrade baisc violet directly, at the same time they could be used as electron acceptors to improve the degradation efficiency of photocatalytic oxidation system. In this study, the degradation efficiency of baisc violet in photoelectrocatalytic oxidation system and that in sole photocatalytic oxidation system were contrasted; the effect of concentration of NaCl, the electrolytic current density, pH on the degradation efficiency of baisc violet in photoelectrocatalytic oxidation system were investigated. The experimental results showed that the degradation efficiency of baisc violet in photoelectrocatalytic oxidation system was much higher than that in sole photocatalytic oxidation. In the photoelectrocatalytic oxidation system, the concentration of NaCl had little effect on the degradation efficiency of baisc violet, and a higher electrolytic current density resulted in a faster degradation rate. The degradation efficiency in basic solution was higher than that in acid and nutrual solution.
出处
《华南师范大学学报（自然科学版）》
CAS
2004年第4期94-99,共6页
Journal of South China Normal University(Natural Science Edition)
