MoO_3/V_2O_5异质结构材料的静电纺丝法制备及光催化性能  

Electrospinning Preparation and Visible-light Photocatalytic Activity of MoO_3/V_2O_5 Heterostructures

作　　者：揣宏媛 周德凤[1] 朱晓飞[1] 杨国程[1] 李朝辉[1] 

机构地区：[1]长春工业大学化学与生命科学学院,长春130012

出　　处：《高等学校化学学报》2014年第5期941-948,共8页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20871023);吉林省科技发展计划项目(批准号:20101549;20130102001JC);吉林省教育厅项目(批准号:2013130;2013146)资助~~

摘　　要：以聚乙烯吡咯烷酮(PVP)、四水合钼酸铵[(NH4)6Mo7O24·4H2O]和偏钒酸铵(NH4VO3)为原料,利用静电纺丝技术结合溶胶-凝胶法制备了在可见光区具有高光催化活性的MoO3/V2O5异质结构半导体光催化剂.采用X射线衍射光谱(XRD)、傅里叶变换红外光谱(FTIR)、场发射扫描电子显微镜(FE-SEM)、X射线光电子能谱(XPS)和紫外-可见(UV-Vis)漫反射光谱等测试手段对材料进行了表征.以光降解亚甲基蓝(MB)为模型反应,考察了MoO3/V2O5异质结构材料的光催化性能.结果表明,n(Mo)/n(V)>1∶8时均能形成MoO3/V2O5异质结构且带隙明显宽于V2O5,可有效地实现光生电子和空穴的分离,增强体系的量子效率,促进光催化活性的提高,其中n(Mo)/n(V)=1∶6时光催化活性最高(达到97.24%),并分析和探讨了光催化机理.MoO3/V2 O5 heterostructures with high photocatalytic activity in visible light region were synthe-sized via electrospinning technique and sol-gel process. The morphologies and structures of MoO3/V2 O5 heterostructures were characterized by X-ray diffraction, field emission scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and UV-visible diffuse reflectance spectros-copy. The photocatalytic performances of MoO3/V2 O5 heterostructures were evaluated by the photodegradation of methylene blue （ MB ） under visible light irradiation. The results indicated that heterojunctions between MoO3 and V2O5 were formed when the n（Mo）/n（V） ratio was above 1：8, and the separation of photogenerat-ed electron-hole pairs on MoO3/V2 O5 heterostructures was promoted, which made the decolorization rate of MB by MoO3/V2 O5 heterostructures much higher than usage of pure V2 O5 nanofibers. The optimum n（ V）/n（ Mo） ratio of MoO3/V2 O5 heterostructures was found to be about 1：6 and the decolorization rate of MB could be reached 97. 24%. In addition, the photocatalytic mechanism of the MoO3/V2 O5 heterostructures was further analyzed and discussed.

关 键 词：光催化剂 异质结构 静电纺丝法 

分 类 号：O614[理学—无机化学]