Preparation and Characterization of Divanadium Pentoxide Nanowires inside SBA-15 Channels

One-dimensional V2O5 nanowires have been synthesized inside the channels of mesoporous silica SBA-15 through chemical approach, which involves aminosilylation of silanol groups on the silica surface, anchoring of isopoly acid, H6V10O28, by neutralization of basic amine groups, and thermal decomposition. The formation and physicochemical properties of the nanowires were monitored and studied by TG-DTA, variable temperature in situ XRD, TEM, N2 sorption measurements and UV-Vis DRS. The results indicate that V2O5 nanowires formed within SBA-15 channels belong to orthorhombic polycrystal domains. The oxygen-to-metal charge transfer band of V2O5 nanowires shows a blue shift in comparison with bulk V2O5, which clearly exhibits the quantum size effect of nanowires.     

静电纺Ag/WO3复合纳米纤维及其光催化性能

为了研究氧化钨(WO_3)和银/氧化钨(Ag/WO_3)纳米纤维光催化性能,利用静电纺丝技术制备了WO_3和Ag/WO_3复合纳米纤维。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和紫外-可见分光光度计(UV-Vis),对样品的物相结构、形貌大小和紫外-可见漫反射光谱等进行了表征。在可见光照射下,比较WO_3和Ag/WO_3纳米纤维光催化降解亚甲基蓝(MB)的性能,结果表明,在90 min时,Ag/WO_3复合纤维光催化降解MB效率比WO_3纤维高1.3倍,从能带结构角度分析了Ag/WO_3复合纤维光催化效率增强的原理。