不同晶相WO_3的热分解法制备及其光催化性能  

WO_3 with Different Crystal Structure Prepared by Thermo-decomposition Method and Its Photocatalysis Activity

作　　者：阎松[1] 韩可可 赵琳[1] 张影[1] YAN Song;HAN Ke-ke;ZHAO Lin;ZHANG Ying(College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun 113001, China)

机构地区：[1]辽宁石油化工大学化学化工与环境学部,抚顺113001

出　　处：《人工晶体学报》2017年第10期1959-1964,共6页Journal of Synthetic Crystals

基　　金：辽宁省教育厅一般项目(L2016023;L2016004)

摘　　要：以钨酸铵为钨源,硝酸为沉淀剂,首先通过沉淀法制备前驱体H_2WO_4,随后采用热分解H_2WO_4法合成六方及单斜晶相WO_3催化剂。利用X射线衍射(XRD)、拉曼光谱、差热-热重(TG-DTA)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)及紫外-可见漫反射光谱(UV-Vis DRS)对H_2WO_4向WO_3转变过程中结构、形貌、组成及光学性质的变化进行研究。结果表明,热处理后前驱体发生如下相变过程:H_2WO_4→六方相WO_3→六方/单斜相WO_3→单斜相WO_3。此外,以罗丹明B为模拟污染物,考察不同晶相WO_3的光催化活性,结果表明,六方相WO_3具有更高的光催化性能,单斜相WO_3的活性较低。H2W04precursor was prepared by precipitation method using ammonium tungstate as a starting material and nitric acid as the precipitation agent.W03photocatalysts with hexagonal and monoclinic phase were obtained by thermal-decomposition H2W04at different temperatures.Crystalline phase,morphology,particle size,chemical composition,surface area and optical properties during the phase transformation from H2W04to W03were investigated by X-ray diffraction(XRD),Raman spectroscopy,differential thermal analysis-thermogravimetry(TG-DTA),scanning electronic microscopy(SEM),N2adsorption-desorption,X-ray photoelectron spectroscopy(XPS),and UV-Vis diffuse reflectance spectroscopy(UV-Vis DRS).The results show that H2W04undergoes the following process after calcination:H2W04-^hexagonal W03->-hexagonal/monoclinic W03->-monolinic W03.Furthermore,the photodegradation of Rhodamine(RhB)as model reaction to investigate the photocatalytic activity of W03with different crystalline phase.Compared with monoclinic W03,hexagonal W03exhibits higher photocatalytic activity.

关 键 词：W03 热分解 单斜相 六方相 光催化 RHB 

分 类 号：O643.36[理学—物理化学]