Study on the Influencing Factors of V-Doped TiO<sub>2</sub> Photocatalysis

Abstract

V-doped TiO2 was prepared by the sol-gel method. The different reaction and preparation conditions of TiO2 and V-doped TiO2were evaluated through the formaldehyde degradation under the visible light. Results showed that the formaldehyde degradation efficiency reached 70.8% when the doping amount of V was 1%(mol), the calcining temperature was 700 oC and pH was 3.5; It improved to 88.5% with 20g activated carbon as support and the 89W energy-saving lamp as light source; The formaldehyde degradation products were H2O and CO2; The specific surface area and pore distribution of TiO2 were analyzed by BET and its crystalline structure was analyzed by XRD,which indicated that mixture of anatase and rutile have large surface area and strong photocatalytic activity due to the V-doping. These suggested that the photocatalytic reactions of formaldehyde included adsorption and photocatalytic oxidation which was obvious for the V-doped TiO2.