掺杂负载型纳米TiO_2降解橙黄G的光催化活性及其动力学研究  

Research on the photocatalytic activity and degradation kinetics of OG over doped TiO_2/AC

作　　者：孙剑辉[1] 王晓蕾[1] 孙靖宇[2] 孙胜鹏[1] 张干[3] 

机构地区：[1]河南师范大学化学与环境科学学院河南省环境污染控制重点实验室,新乡453007 [2]浙江大学竺可桢学院,杭州310058 [3]中国科学院广州地球化学研究所有机地球化学国家重点实验室,广州510640

出　　处：《环境污染治理技术与设备》2006年第12期72-76,共5页Techniques and Equipment for Environmental Pollution Control

基　　金：河南省重点科技攻关项目(0523032200)

摘　　要：采用溶胶-凝胶法和浸渍-焙烧法制备了掺杂Sn(IV)的TiO2/AC光催化剂,以偶氮染料橙黄G为目标降解物,对光催化反应条件进行了优化。结果表明:利用Sn(IV)掺杂量为2.5 a.t%的TiO2/AC光催化剂,在进水浓度50 mg/L,催化剂的用量12.5 g/L,pH值2.0,H2O21.5 mL/L,主波长为365 nm的300 W高压汞灯光照条件下,反应60 m in,橙黄G的光催化去除率可达99.1%。该反应符合Langmu ir-H inshelwood动力学方程,其速控步为吸附反应。共存阴离子SO24-和H2PO-4,对橙黄G的光催化降解反应均有一定的抑制作用。Sn（Ⅳ） doping and nanometer-size TiO2 photocatalyst immobilized on activated carbon （TiO2/ AC） was prepared by sol-gel and dip-calcined method. The optimum photocatalytic conditions were studied by degradation of an azo dye orange G （OG）. The results showed that optimal photocatalytic reacting conditions were using the Sn（IV） （2.5 at. % ） doping TiOJAC as photocatalyst, 50 mg/L OG concentration, 12.5 g/L catalyst amount, 2. 0 pH value, 1.5 mL/L H2O2. Using the 300 W high-pressure mercury light （main wavelength around 365 nm） as light source and the removal rate of OG reached 99.1% in the optimal condition after 60 min reaction. The kinetics of this reaction was in accordance with Langmuir-Hinshelwood equation and the rate controlling step was absorption reaction. The co-existed negative ions, such as SO4^2- ,H2PO4^- , had negative effect on degradation of OG.

关 键 词：掺杂Sn(Ⅳ) 负载型纳米TIO2 橙黄G 光催化活性 动力学 

分 类 号：X703.1[环境科学与工程—环境工程]