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.
出处
《环境污染治理技术与设备》
CSCD
北大核心
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)
