A photocatalytic reaction kinetics model based on electrical double layer theory(Ⅰ) Surface complexation model at TiO_2/water interface

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 TiO_2 based on electrical double la ye r (EDL) theory at the TiO_2/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