N掺杂TiO_(2)纳米纤维光催化氧化NO

N-doped TiO_(2) nanofibers for photocatalytic oxidation of NO

为提升TiO_(2)纳米纤维的光吸收性能,将纳米片组装的TiO_(2)纳米纤维与含氮的有机物(尿素、三聚氰胺和二氰二胺)一起混合煅烧,成功制备了氮掺杂TiO_(2)纳米纤维,探讨了N掺杂对TiO_(2)光催化性能的影响.采用扫描电镜(SEM)、傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)、X射线光电子能谱(XPS)、可见紫外漫反射光谱(UV-vis DRS)和粉末荧光光谱(PL)等手段,对光催化剂进行了表征,通过可见光下氧化NO来评价催化剂的活性.结果表明:N掺杂有效提高TiO_(2)纳米纤维的光催化活性,其中,以尿素为N源所制备的N掺杂TiO_(2)纳米纤维[N-TiO_(2)(U)],表现出最强的光催化氧化NO活性,其NO去除率高达50.8%,显著高于本征TiO_(2)纳米纤维39.4%的NO去除率.这归因于N掺杂增强了光吸收性,并提升了TiO_(2)纳米纤维载流子分离效率.

To improve the light absorption property of TiO_(2) nanofibers,N-doped TiO_(2) nanofibers were successfully synthesized by calcination of the mixture of TiO_(2) nanofibers and N-containing organic substances such as urea,dicyandiamide and melamine,and the effect of N-doping on the photocatalytic performance of TiO_(2) nanofibers was also investigated.The photocatalysts were characterized by SEM,FTIR,XRD,XPS,UV-vis DRS and PL,etc,and the activity was evaluated by photocatalytic oxidation of NO.It was found that N-doping could effectively improve the photocatalytic activity of TiO_(2) nanofibers.The sample N-TiO_(2)(U)which was prepared using urea as the nitrogen source showed the highest photocatalytic activity towards NO oxidation,with a NO removal rate of 50.8%,much higher than that of pristine TiO_(2) nanofibers(39.4%).The enhanced photoreactivity of TiO_(2)-NFs was ascribed to the doping of N,which improved the light-harvesting ability and stimulated the separation of photo-generated charge carriers.