以ZnO及WO3为前驱反应物,制备了一系列不同ZnWO4含量的ZnWO4-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ZnWO4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%ZnWO4,并于850 ℃煅烧所制得的ZnWO4-ZnO催化剂活性最高,比纯ZnO高出25%.这是因为ZnWO4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.
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