State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, P. R. China ; Department of Biological and Environmental Science, Changsha University, Changsha 410022, P.R. China.
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, P. R. China.
Beilstein J Nanotechnol. 2014 May 19;5:658-66. doi: 10.3762/bjnano.5.77. eCollection 2014.
Silver chromate (Ag2CrO4) photocatalysts are prepared by microemulsion, precipitation, and hydrothermal methods, in order to investigate the effect of preparation methods on the structure and the visible-light photocatalytic activity. It is found that the photocatalytic activity of the prepared Ag2CrO4was highly dependent on the preparation methods. The sample prepared by microemulsion method exhibits the highest photocatalytic efficiency on the degradation of methylene blue (MB) under visible-light irradiation. The enhanced photocatalytic activity could be ascribed to the smaller particle size, higher surface area, relatively stronger light absorption, and blue-shift absorption edge, which result in the adsorption of more MB molecules, a shorter diffusion process of more photogenerated excitons, and a stronger oxidation ability of the photogenerated holes. Considering the universalities of microemulsion, precipitation, and hydrothermal methods, this work may also provide a prototype for the comparative study of semiconductor based photocatalysis for water purification and environmental remediation.
铬酸银（Ag2CrO4）光催化剂分别通过微乳液法、沉淀法和水热法制备，以研究不同制备方法对结构和可见光光催化活性的影响。结果表明，所制备的 Ag2CrO4 的光催化活性高度依赖于制备方法。在可见光照射下，微乳液法制备的样品对亚甲基蓝（MB）的降解表现出最高的光催化效率。增强的光催化活性可归因于更小的粒径、更高的比表面积、相对更强的光吸收和蓝移吸收边缘，这导致更多的 MB 分子被吸附，更多光生激子的扩散过程更短，以及光生空穴的氧化能力更强。考虑到微乳液法、沉淀法和水热法的通用性，这项工作也可能为水净化和环境修复用半导体光催化的比较研究提供一个原型。
