【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。更多还原

【Abstract】 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 TiO₂/AC 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 SO^2-₄、H₂PO^-₄,had negative effect on degradation of OG.更多还原