摘要
以Bi(NO3)3、Na2WO6为原料,采用微乳液法成功合成新型可见光活性的钨酸铋Bi2WO6光催化剂,并利用X射线衍射、扫描电镜、X射线光电子能谱及紫外-可见光漫反射光谱(diffusion reflectance spectra,DRS)等技术手段表征样品的结构和性能。以可见光(波长λ>400nm)为光源研究Bi2WO6对甲基橙分子降解的可见光催化性能。结果表明:通过调节微乳液体系的合成温度可得到正交相结构的Bi2WO6光催化剂。DRS结果表明:Bi2WO6的光响应波长范围已扩展到400nm以上的可见光区。光催化实验结果表明:合成温度是影响Bi2WO6可见光催化活性的主要因素,合成温度为170℃时,制备的Bi2WO6光催化效率最高,3h内使甲基橙的脱色率达到98.9%。
The novel visible light-driven Bi2WO6 photocatalysts were synthesized via a reverse microemulsion method using Bi（NO3） 3 and Na2WO6 as starting materials.The as-prepared samples were characterized by the X-ray diffraction,scanning electron microscope,X-ray photoelectron spectroscopy,and ultraviolet-visible diffuse reflectance spectroscopy（DRS） .The visible light-driven photocatalytic performance of the Bi2WO6 was evaluated by the degradation of methyl orange molecules using visible light（wave-lengthλ400 nm） as a light source.The results reveal that the Bi2WO6 photocatalysts with orthorhombic structures are obtained by adjusting synthesis temperatures of the reverse microemulsion solutions.The DRS results show that Bi2WO6 photocatalysts had ex-tended the light absorption spectrum toward the visible region by more than 400 nm.The photocatalytic tests indicate that the synthesis temperatures of the microemulsion solutions are the main factors that affect the visible light-driven photocatalytic activities.The highest methyl orange degradation of 98.9%within 3 h is achieved over the Bi2WO6 samples with a synthesis temperature of 170℃.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2010年第3期457-462,共6页
Journal of The Chinese Ceramic Society
基金
教育部科学技术研究重点(108024)
教育部博士点基金(200804251014)
北京市科技新星计划(2008B76)资助项目
关键词
钨酸铋
光催化
可见光
微乳液
bismuth tungstate
photocatalyst
visible light
microemulsion
作者简介
戈磊（1979-），男，博士，副教授。E-mail：gelei08@sina．com
