A photocatalytic reaction kinetics model based on
electrical double layer theory(Ⅰ) ——Surface complexation model at TiO2/water interface
electrical double layer theory(Ⅰ) ——Surface complexation model at TiO2/water interface
(1. Guangzhou Institute of Energy Conversion, The Chinese Academy of Sciences,
Guangzhou 510070, China；
2. Guangdong Key Laboratory of Agricultural Environment Pollution
Integrated Control, Guangdong Institute of Eco-Environment and
Soil Science, Guangzhou 510650, China;
3. Panzhihua Institute of Iron and Steel, Panzhihua 617067, China)
Guangzhou 510070, China；
2. Guangdong Key Laboratory of Agricultural Environment Pollution
Integrated Control, Guangdong Institute of Eco-Environment and
Soil Science, Guangzhou 510650, China;
3. Panzhihua Institute of Iron and Steel, Panzhihua 617067, China)
Abstract: The kinetics of photocatalysis can be us ually described by Langmiur-Hinshelwood adsorption expression. The adsorption can be greatly influenced by the surface properties of photocatalyst. Triple layer model (TLM) was c hosen to describe the surface adsorption of TiO2 based on electrical double la ye r (EDL) theory at the TiO2/water interface. And through the potentiometric titration the parameters of TLM were determined by the extrapolation method and Fiteql3.1 software. The results show that surface complexation dominates the surface charge and the numerical calculation fits the experiment data satisfactorily.
Key words: TiO2; photocatalysis; model; adsorption