Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China; University of the Chinese Academy of Sciences, Beijing 100039, China.
J Hazard Mater. 2013 Dec 15;263 Pt 2:650-8. doi: 10.1016/j.jhazmat.2013.10.027. Epub 2013 Oct 22.
Novel highly active visible light photocatalysts BiOBr-TiO2 nanocomposites were prepared by a facile one-pot solvothermal approach. Series of characterizations verified that the BiOBr nanoscale crystals are highly dispersed in amorphous TiO2 to form the hybrid mesoporous structure. The material shows excellent photocatalytic performance towards photodegradation of Rhodamine B under visible light irradiation. The content ratio between TiO2 and BiOBr plays a key role in the microstructure of the nanocomposites, so as to result in distinguished photocatalytic activity. The sample with a molar ratio of 10 between TiO2 and BiOBr shows the optimum performance. The high photocatalytic activity of BiOBr-TiO2 nanocomposites under visible light could be ascribed to the large surface area, opened mesoporous structure, appropriate band-gap, as well as synergistic effect between TiO2 and BiOBr. Besides, the BiOBr-TiO2 composites render a facile separation due to the three-dimensional superstructure. The BiOBr-TiO2 photocatalyst is very promising for water purification as well as other environmental applications.
采用简便的一锅溶剂热法制备了新型高效可见光光催化剂 BiOBr-TiO2 纳米复合材料。一系列的表征验证了 BiOBr 纳米晶体高度分散在无定形 TiO2 中，形成了混合介孔结构。该材料在可见光照射下对 Rhodamine B 的光降解表现出优异的光催化性能。TiO2 和 BiOBr 之间的含量比对纳米复合材料的微观结构起着关键作用，从而导致了显著的光催化活性。TiO2 和 BiOBr 摩尔比为 10 的样品表现出最佳性能。BiOBr-TiO2 纳米复合材料在可见光下具有高的光催化活性，这归因于其大的比表面积、开放的介孔结构、适当的能带隙以及 TiO2 和 BiOBr 之间的协同效应。此外，BiOBr-TiO2 复合材料由于具有三维超结构而易于分离。BiOBr-TiO2 光催化剂在水净化以及其他环境应用方面具有广阔的应用前景。
