摘要
采用溶胶-凝胶法制备了掺杂Sn(Ⅳ)的TiO2/AC光催化剂,以生物染料橙黄G为目标降解物,研究了多相光催化降解橙黄G的动力学规律。研究表明,该反应符合Langmuir-Hinshelwood动力学方程,速控步为吸附反应。同时,利用GC/MS联用仪探讨了橙黄的中间产物及其降解机理:橙黄G在强氧化性自由基·OH、·OOH、·O2-的作用下逐渐分解氧化为小分子有机醛、酮、酸,最后转化为CO2、NH4+、NO3-、NO2-、SO42-和H2O等无机小分子。
The Sn（ Ⅳ ） TiO2/activated carbon catalyst was prepared by the Sol-gel method. The optimum conditions for catalytic photodegradation of Orange G were; pH = 2.0, 2.5% Sn（Ⅳ）, catalyst dose = 10 g/L, H2O2 1.5 mL/L. The reaction kinetics was determined from the concentration decay curves for solutions with different initial concentrations （10-60 mg/L）. The data were well represented by the Langmuir-Hinshelwood model for simultaneous adsortption and reaction; the overall reaction rate was assumed to be controlled by the adsorption step since the observed adsorption equilibrium constant was much smaller relative to the apparent reaction rate constant. The GC/ MS data show that the dye was oxidized in multiple steps to form several smaller intermediate cdmpounds and eventually to CO2, inorganic ions （sulfate, nitrate and ammonium） and water.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2006年第12期908-910,913,共4页
Environmental Pollution & Control
基金
河南省重点科技攻关项目(No.0523032200)。
