ZnWO_4-ZnO复合光催化剂的制备及光催化性能  

Preparation of ZnWO_4-ZnO Composite Photocatalyst and Its Photocatalytic Activity

作　　者：郝艳艳[1] 张影[1] 赵琳[1] 阎松[1] 

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3期457-462,共6页Journal of Synthetic Crystals

基　　金：辽宁省教育厅一般项目(L2016004;L2016023)

摘　　要：以ZnO及WO_3为前驱反应物,制备了一系列不同ZnWO_4含量的ZnWO_4-ZnO复合光催化剂。利用X射线衍射、扫描电子显微镜及X射线能谱仪等手段对催化剂进行表征,并以紫外光为光源,罗丹明B为模拟污染物,评价催化剂的活性。结果表明,热处理温度及ZnWO_4与ZnO摩尔比对催化剂光催化降解罗丹明B的活性影响显著。当复合4mol%ZnWO_4,并于850℃煅烧所制得的ZnWO_4-ZnO催化剂活性最高,比纯ZnO高出25%。这是因为ZnWO_4的复合可抑制ZnO晶粒长大,提高光生电子与空穴的分离效率,进而改善其光催化活性。A serious of ZnWO4-ZnO composite photocatalysts with various ZnWO4 concentrations were prepared by calcined mixed ZnO and WO3 powder at different temperature.The photocatalysts were characterized by X-ray diffraction,scan electron microscopy and energy dispersive X-ray spectroscopy.The photocatalytic activity of the samples was evaluated by photocatalytic degradation of Rhodamine B under UV light irradiation.The results show that the photocatalytic activity of the ZnWO4-ZnO composite catalyst is depend on the calcination temperature and the molar ratio of ZnWO4 to ZnO.The ZnWO4-ZnO composite photocatalyst with 4mol% concentration of ZnWO4 show the highest degradation rate.The high efficiency of the ZnWO4-ZnO composites is explain by the improved charge separation of the photogenerated electron-hole pairs.

关 键 词：ZnWO4-ZnO 复合催化剂 光催化 罗丹明B 

分 类 号：TB303[一般工业技术—材料科学与工程]