滑石-TiO_2复合纳米纤维的制备与光催化性能研究

Preparation and Photocatalytic Property of Talcum-TiO_2 Composite Nanofibers

通过溶胶过程和静电纺丝工艺制备了滑石-TiO_2复合纳米纤维。利用溶胶工艺将钛酸四丁酯、聚乙烯吡咯烷酮、乙酸、无水乙醇和滑石制备成静电纺丝前驱体,通过静电纺丝工艺和热处理后得到直径约为200 nm的滑石-TiO_2复合纳米纤维。采用X射线衍射、扫描电镜、透射电镜和紫外-可见漫反射光谱对复合纳米纤维进行表征,并且通过降解亚甲基蓝光研究其光催化性能。结果表明:在紫外光照射下,500℃热处理的滑石-TiO_2复合纳米纤维的光催化活性最好,降解率达到99.7%。

The talcum-TiO_2 composite nanofibers were prepared via sol-gel process and electrospinning technology. The raw materials of electrospinning precursor were tetrabutyl titanate, polyvinyl pyrrolidone, acetic acid, ethanol absolute and talcum by sol-gel process. After electrospinning and calcining at 500 ℃, the diameter of talcum-TiO_2 composite nanofibers is about 200 nm. X-ray powder diffraction(XRD), scanning electronic microscope(SEM), Transmission electron microscopy(TEM), UV-visible diffuse-reflectance spectrum(UV-Vis) were employed to investigate the composite nanofibers. The photocatalytic activity of the samples was evaluated by degradation of methylene blue dye. The results show that the photocatalytic efficiency is the highest when the sample with 2.0 wt% talcum is calcined at 500 ℃ for 3 h and the methylene blue dye degradation rate is 99.7%.