Ag/TiO_2中空纳米纤维结构材料的太阳光催化性能

Sunlight-activity of Ag/TiO_2 nano-fiber materials with hollow structure

利用一种模板辅助的两步法制备银修饰的TiO2中空纤维光催化纳米结构材料(Ag/TiO2),借助于扫描电子显微镜(SEM),X光电子能谱(XPS),X线衍射(XRD),UV-vis光谱,Zeta电位等技术以及亚甲基蓝(MB)在不同光源条件下的降解脱色对目标材料结构、性能等进行了表征.结果表明:在空气气氛和适当温度下处理前驱材料(Ag+-Ti 4+/CF)可以同时实现模板(CF)的去除,Ti 4+→TiO2和Ag+→Ag的原位转化;材料的纳米纤维结构化和适量Ag(0.20%,质量分数)的引入有利于其太阳光催化性能的提高;该纤维材料易于分离,再利用.该纳米纤维结构材料良好的太阳光催化性能是众多因素协同作用的结果.

Ag-modified TiO2 nanofiber materials with hollow structure were successfully synthesized via a novel template-assisted two-steps method and characterized by scanning electron microscopy（SEM）, X-ray diffraction（XRD）, Zeta potential, X-ray photoelectron spectroscopy（XPS）, and UV-vis techniques. Using the degradation of methylene blue（MB） as the model reaction, the photocatalytic activities of the samples were investigated under different light sources. The results showed that under air atmosphere and a proper temperature, calcining the precursor Ag＋-Ti4＋/CF could bring about both the remove of the cotton template and the transitions of Ti4＋→TiO2 and Ag＋→Ag to produce Ag/TiO2 hollow nanofiber structured materials. The nanofiber structure of the material and a proper amount of Ag modification （0.20G） remarkably improved the sunlight-activity of TiO2 photocatalyst, and the material was easily removed by centrifugal separation. The enhanced sunlight- activity of the Ag/TiO2 nanofiber structured material was ascribed to a synthetic effect of many factors.