A kinetic model for describing effect of the external surface concentration of TiO_2 on the reactivity of eggshell activated carbon supported TiO_2 photocatalyst

摘要

The porous support supported TiO_2 is considered to be the promising photocatalyst due to the fact that it is easily recovered from water and has high capacity to mineralize pollutants. Obviously, the expected structure of this kind of photocatalyst is egg-shell, that is, TiO_2 is mainly on the external surface of the porous support. The reactivity of the supported photocatalyst strongly depends on the concentration of TiO_2 on the external surface of the porous support. In this study, a kinetic model was developed to describe the effect of the external surface concentration of TiO_2 (CESC) on the reactivity of egg-shell activated carbon (AC) supported TiO_2 photocatalysts. It was found that the obtained model precisely described the effect of CESC,on the reactivity of TiO_2/AC photocatalysts. This study can be used to deeply understand the performance of TiO2/AC catalysts and to provide valuable information on designing efficient supported TiO_2 photocatalysts.