光电催化降解活性艳红K-2BP中电解质NaCl和Na_2SO_4的作用研究  

Effect of Electrolytes NaCl and Na_2SO_4 on the Photoelectrocatalytic Degradation of Reactive Brilliant K-2BP

作　　者：杜琳[1] 吴进[1] 李桂英[1] 秦松[1] 胡常伟[1] 

机构地区：[1]四川大学化学学院绿色化学与技术教育部重点实验室,成都610064

出　　处：《化学学报》2006年第24期2486-2490,共5页Acta Chimica Sinica

基　　金：高等学校优秀青年教师教学科研奖励计划(2002)资助项目.

摘　　要：以TiO2/Ti为阳极,Ti网为阴极,研究了活性艳红K-2BP在NaCl和Na2SO4电解质中的降解情况,深入探讨了两种电解质在光电催化降解染料中的作用,研究了电解质浓度、溶液pH值的影响,并讨论了在混合盐电解质存在下,活性艳红K-2BP的降解行为.研究表明,以NaCl为电解质时,Cl-会转化为氧化性很强的活性氯,活性氯及光电的共同作用,加速了染料的降解.以Na2SO4为电解质时,SO42-在光电的作用下将发生两类反应,一部分SO42-捕获光生空穴和HO?,对光电催化降解染料起抑制作用;另一部分SO24-将发生反应生成H2O2,对染料降解起促进作用.Cl^- and SO^2-4 are the most common inorganic ions in dye polluted water. The effect of these ions on the photoelectrocatalytic degradation of the reactive brilliant K-2BP using TiO2/Ti as anode is investigated. It is found that the concentration of the electrolyte, the acidity of the solution and the use of mixed electrolytes alter the degradation process. When NaCl is used as the electrolyte, active chlorine is formed during the process, and is found to be responsible in combination with photo- and electro-effects for the degradation of dye; while Na2SO4 is used as electrolyte, two categories of reactions wiU occur. SO4^2- may trap HO. and h^＋, thus the efficiency of degradation is reduced. Under the conditions investigated, SO4^2- ion may also catalyze the formation of hydrogen peroxide, which is active for the degradation, and then the degradation is favored.

关 键 词：光电催化 活性艳红K-2BP TiO2/Ti电极 电解质 

分 类 号：X791[环境科学与工程—环境工程]