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以体积比为1:2的N,N-二甲基甲酰胺和丙酮为溶剂、钛酸四丁酯[Ti(OiPr)4]和氯化钒[VCl3]为前驱体、醋酸纤维素(CA)为模板,采用静电纺丝法制备了V-TiO2/醋酸纤维素纳米纤维。将V-TiO2/醋酸纤维素纳米纤维用0.1 mol/L NaOH/乙醇溶液水解得到V-TiO2/纤维素纳米纤维。在500℃煅烧V-TiO2/纤维素纳米纤维5 h,得到直径为(200±53)nm的V-TiO2纳米纤维。利用扫描电子显微镜、X射线粉末衍射仪和紫外–可见漫反射光谱对纤维形貌、物相和结构进行了表征。以染料罗丹明B为目标降解物考察了纤维的光催化活性。结果表明:掺杂少量V后,TiO2对紫外光的最大吸收峰和吸收带边发生了红移,说明V-TiO2对光响应更宽、光利用率更高。TiO2和V-TiO2纳米纤维在20min内对罗丹明B的降解率分别为67%和77%。
Ti (OiPr) 4] and vanadium chloride [VCl3] were used as precursors in the reaction of N, N-dimethylformamide and acetone in a volume ratio of 1: 2. ) As a template, prepared by electrospinning V-TiO2 / cellulose acetate nanofibers. V-TiO2 / cellulose nanofibers were hydrolyzed by 0.1 mol / L NaOH / ethanol solution to obtain V-TiO2 / cellulose nanofibers. The V-TiO2 / cellulose nanofibers were calcined at 500 ℃ for 5 h to obtain (200 ± 53) nm V-TiO2 nanofibers. The morphology, phase and structure of the fibers were characterized by scanning electron microscopy, X-ray powder diffraction and UV-Vis diffuse reflectance spectroscopy. The photocatalytic activity of the fiber was investigated with the dye Rhodamine B as the target degradation product. The results show that the red shift of the maximum absorption peak and the absorption band edge of TiO2 is observed when a small amount of V is doped, which shows that V-TiO2 has a wider response to light and a higher utilization rate of light. The degradation rates of Rhodamine B in TiO2 and V-TiO2 nanofibers were 67% and 77% respectively within 20 min.