title: Photocatalytic degradation properties of V-doped TiO2to automobile exhaust.
abstract: To improve the photocatalytic degradation properties of titanium dioxide (TiO2) used as raw materials for purifying automobile exhaust (AE), the vanadium (V)-doped TiO2samples were prepared. The photocatalytic degradation efficiencies of V-doped TiO2to each component in AE were evaluated under ultraviolet (UV) and visible light irradiation, respectively. Results indicated that the photocatalytic activity of V-doped TiO2to AE was higher than that of pure TiO2, and the optimal V dopant content of TiO2was 1.0% under UV light irradiation. The degradation efficiencies of V-doped TiO2to NOx and HC were higher than those to CO2and CO in AE because of the reversible reaction between CO2and CO. In addition, it was found that the photocatalytic degradation efficiencies of V-doped TiO2to each component in AE were also increased under visible light irradiation. The V-doped TiO2also showed higher degradation efficiencies to NOx and HC than those to CO2and CO under visible light irradiation. The V doped TiO2presented higher photocatalytic activity to CO2than that to CO, but the reversible reaction between CO and CO2was not found under visible light irradiation. The photocatalytic reactions of pure and V-doped TiO2samples to each component in AE followed the first order kinetic pathway under the two light irradiations. It is concluded that the V doping is a feasible method to improve the photocatalytic degradation properties of TiO2to AE for air purification, developing a sustainable environmental purification technology based on TiO2materials.
authors.affiliation: School of Civil Engineering, Nanjing Forestry University, 159, Longpan Road, Nanjing 210037, Jiangsu, China.
authors.forename: Tong
authors.initials: T
authors.lastname: Wang
authors.affiliation: School of Civil Engineering, Nanjing Forestry University, 159, Longpan Road, Nanjing 210037, Jiangsu, China.
authors.forename: Dongya
authors.initials: D
authors.lastname: Shen
authors.affiliation: School of Civil Engineering, Nanjing Forestry University, 159, Longpan Road, Nanjing 210037, Jiangsu, China. Electronic address: seuxt@163.com.
authors.forename: Tao
authors.initials: T
authors.lastname: Xu
authors.affiliation: Jiangsu Modern Highway & Bridge Co. Ltd., 2, Xianlin Avenue, Nanjing 210046, Jiangsu, China.
authors.forename: Ruiling
authors.initials: R
authors.lastname: Jiang
keywords: Automobile exhaust; Photocatalytic degradation property; Titanium dioxide; Vanadium doping; Visible light