悬浮TiO_2-铂电极体系光电催化降解染料  

Photoelectrocatalytic Degradation of Procion Red MX-5B in TiO_2 suspension-Pt Electrode System

作　　者：张文杰[1] 王宽岭[1] WONG Po-keung 

机构地区：[1]沈阳理工大学环境与化学工程学院,辽宁沈阳110168 [2]香港中文大学生物系

出　　处：《环境科学与技术》2010年第10期120-123,共4页Environmental Science & Technology

基　　金：国家自然科学基金(50774074)

摘　　要：文章采用悬浮TiO2-铂电极体系,以悬浮TiO2作为光催化剂,在两片铂电极间施加一定的电压,研究了染料Procion Red MX-5B在NaCl和Na2SO4电解质溶液中的光电催化降解。光电催化的效率与NaCl溶液的浓度和外加电压密切相关,在0.3mol/L的NaCl溶液中,外加电压8V的条件下,10min内染料的脱色率达到95%,而同时间内光催化脱色率只能达到35%。当外加电压超过5V时,电降解几乎与光电催化具有相同的染料脱色率,然而电降解并不能使染料降解的中间物矿化。光电催化能够在反应的最初一个小时去除溶液中80%的TOC,相同时间内光催化能够去除50%。光电催化与光催化都不能完全矿化所处理的染料,原因在于溶液中生成了非常稳定的降解产物。在Na2SO4溶液中,外加电压只能轻微的提高染料的脱色率,但却不能促进中间产物的分解。In the present study,photo-electro-catalytic (PEC)degradation of Procion Red MX-5B was investigated in aqueous NaCl and Na2SO4 solutions which were used as electrolytes in the PEC degradation of the dyestuff,Procion Red MX- 5B,and TiO2 particles dispersed into water were chosen as the photo-catalyst combined with two platinum electrodes. It was found that PEC degradation efficiency was dependent on the concentrations of aqueous NaCl solution and the applied potentials. Electro -degradation could be as power...

关 键 词：光电催化 Procion RED MX-5B TIO2 电降解 

分 类 号：X703[环境科学与工程—环境工程]