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利用一种模板辅助的两步法制备了一系列Zn2+掺杂的TiO2中空纤维纳米材料(Zn2+/TiO2);利用扫描电子显微镜(SEM)、X射线衍射(XRD)、X光电子能谱(XPS)和紫外-可见光谱(UV-Vis)等技术进行表征;以亚甲基蓝(MB)的降解为模型反应,考察Zn2+量对TiO2中空纤维纳米材料光催化性能的影响。结果表明:制备的样品为复制了模板形貌的中空结构纳米纤维材料;在0.00～0.62%Zn2+量范围内,Zn2+/TiO2的光催化活性明显高于TiO2的,且随掺杂量呈先增后降的变化趋势,当Zn2+量在0.29%左右时,其光催化活性最高,在太阳光下3h,MB溶液在Zn2+/TiO2表面的脱色降解率达98%以上,而在TiO2表面仅为60%;Zn2+/TiO2在重复使用5次时仍能保持MB溶液脱色率在90%以上。样品Zn2+/TiO2所表现出的优良催化性能是众多因素-表面羟基、吸附氧、Zn2+活性位、特殊的纤维形貌等协同作用的结果。
A series of Zn2 + -doped TiO2 hollow fiber nanomaterials (Zn2 + / TiO2) were prepared by a two-step template-assisted method. The surface morphology of Zn2 + / TiO2 nanostructures was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy And UV-Vis. The degradation of methylene blue (MB) was used as a model reaction to investigate the effect of Zn2 + on the photocatalytic activity of TiO2 hollow fiber nanomaterials. The results show that the prepared nanostructured hollow fiber nanofibers have the same template morphology. The photocatalytic activity of Zn2 + / TiO2 is obviously higher than that of TiO2 in the range of 0.00 ~ 0.62% Zn2 + After 2 hours, the photocatalytic activity of Zn2 + was the highest at 0.29%, and the degradation rate of MB solution on Zn2 + / TiO2 was 98% %; Zn2 + / TiO2 can still maintain the decolorization rate of MB solution above 90% when it is reused 5 times. The excellent catalytic performance of the sample Zn2 + / TiO2 is the result of many factors - the surface hydroxyl, adsorbed oxygen, Zn2 + active sites, special fiber morphology and other synergies.