Ag/Bi2WO6复合材料的制备及光催化性能

采用一步水热合成法制得花球状Bi_2WO_6和Ag/Bi_2WO_6光催化剂,借助X射线衍射(XRD)、场发射扫描电子显微镜(FES-EM)、透射电子显微镜(TEM)、X射线光电子能谱分析(XPS)、紫外-可见分光光度法(UV-Vis)等手段对样品进行结构性能表征。模拟日光的条件下,以甲基橙(MO)为降解物,对Bi_2WO_6和Ag/Bi_2WO_6的催化活性和机理进行研究。结果表明,相对Bi_2WO_6,相同条件下Ag/Bi_2WO_6对MO具有更佳的降解效果,当Ag掺杂量为1%(n/n)时,其降解率(180 min)可达到91.4%,同时一次回收样降解率也达到81%。此外,也对Ag/Bi_2WO_6复合材料的降解机理做了初步探究。

Preparation and Photocatalytic Properties of Ag/Bi2WO6 Composites

One-step hydrothermal synthesis was used to prepare spherical Bi₂WO₆ and Ag/Bi₂WO₆ photocatalysts, and the properties of the samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), ultravioletvisible spectrophotometry (UV-Vis) and other means. Under the condition of simulating sunlight, the catalytic activity and mechanism of Bi₂WO₆ and Ag/Bi₂WO₆ were studied using methyl orange (MO) as degradation product. The results show that compared with Bi₂WO₆, Ag/Bi₂WO₆ has a better degradation effect on MO under the same conditions. When the Ag doping amount was 1%(n/n), the degradation rate (180 min) reached 91.4%, and the degradation rate of the recovered sample was also obtained, which also reached 81%. In addition, a preliminary study of the degradation mechanism of Ag/Bi₂WO₆ composites was also performed.