在聚乙烯吡咯烷酮的辅助下,采用多元醇法制备了不同铜/锌摩尔比的硫化亚铜/四针状氧化锌晶须纳米复合材料,并利用X射线衍射、场发射扫描电镜、X射线光电子能谱和紫外-可见漫反射光谱对样品进行了表征.结果表明,在紫外光照射下,样品对甲基橙的光降解效率优于纯ZnO晶须.在铜/锌摩尔比低于4％时,样品的光催化性能随着铜/锌摩尔比增加而增加,但随着铜/锌摩尔比的继续增加,样品的光催化性能下降.此外,还采用周期实验来评价催化剂的稳定性.结果表明,该催化剂具有优异的光催化稳定性.
Nanocomposites of tetrapod-like ZnO whisker (T-ZnOw) with loaded Cu2S were synthesized with different Cu/Zn molar ratios with the assistant of poly(vinyl pyrrolidone) (PVP) by the polyol process.The composite samples were characterized by X-ray diffraction,field emission scanning electron microscopy,X-ray photoelectron spectroscopy,and UV-visible diffuse reflectance spectroscopy.The photocatalytic activities for the Cu2S/T-ZnOw nanocomposites increased with Cu/Zn molar ratio up to 4％,and then decreased with further increase of the Cu/Zn molar ratio up to 10％.The Cu2S/T-ZnOw nanocomposites exhibited higher activity than T-ZnOw for the photocatalyric degradation of methyl orange.Recycling experiments were also performed.The photocatalytic activity of the photocatalyst showed no decrease after three cycles,which demonstrated that the Cu2S/T-ZnOw photocatalyst had excellent stability.
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