School of Civil Engineering, Nanjing Forestry University, 159, Longpan Road, Nanjing 210037, Jiangsu, China.
School of Civil Engineering, Nanjing Forestry University, 159, Longpan Road, Nanjing 210037, Jiangsu, China.
Sci Total Environ. 2017 May 15;586:347-354. doi: 10.1016/j.scitotenv.2017.02.021. Epub 2017 Feb 7.
To improve the photocatalytic degradation properties of titanium dioxide (TiO) used as raw materials for purifying automobile exhaust (AE), the vanadium (V)-doped TiO samples were prepared. The photocatalytic degradation efficiencies of V-doped TiO to each component in AE were evaluated under ultraviolet (UV) and visible light irradiation, respectively. Results indicated that the photocatalytic activity of V-doped TiO to AE was higher than that of pure TiO, and the optimal V dopant content of TiO was 1.0% under UV light irradiation. The degradation efficiencies of V-doped TiO to NOx and HC were higher than those to CO and CO in AE because of the reversible reaction between CO and CO. In addition, it was found that the photocatalytic degradation efficiencies of V-doped TiO to each component in AE were also increased under visible light irradiation. The V-doped TiO also showed higher degradation efficiencies to NOx and HC than those to CO and CO under visible light irradiation. The V doped TiO presented higher photocatalytic activity to CO than that to CO, but the reversible reaction between CO and CO was not found under visible light irradiation. The photocatalytic reactions of pure and V-doped TiO samples 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 TiO to AE for air purification, developing a sustainable environmental purification technology based on TiO materials.
为了提高用于净化汽车尾气（AE）的二氧化钛（TiO）的光催化降解性能，制备了掺钒（V）的 TiO 样品。分别在紫外（UV）和可见光照射下，评价了 V 掺杂 TiO 对 AE 中各组分的光催化降解效率。结果表明，V 掺杂 TiO 对 AE 的光催化活性高于纯 TiO，在 UV 光照射下，TiO 的最佳 V 掺杂含量为 1.0%。由于 CO 和 CO 之间的可逆反应，V 掺杂 TiO 对 AE 中 NOx 和 HC 的降解效率高于对 CO 和 CO 的降解效率。此外，还发现 V 掺杂 TiO 在可见光照射下对 AE 中各组分的光催化降解效率也有所提高。V 掺杂 TiO 在可见光照射下对 NOx 和 HC 的降解效率也高于对 CO 和 CO 的降解效率。V 掺杂 TiO 对 CO 的光催化活性高于 CO，但在可见光照射下未发现 CO 和 CO 之间的可逆反应。纯和 V 掺杂 TiO 样品对 AE 中各组分的光催化反应在两种光照下均遵循一级动力学途径。结论是，V 掺杂是提高 TiO 对 AE 的光催化降解性能以用于空气净化的一种可行方法，为基于 TiO 材料的可持续环境净化技术开发奠定了基础。
