Mn掺杂TiO_2负载竹质活性炭纤维的制备及可见光光催化性能研究

Preparation of Mn-doped TiO_2 loaded on bamboo based activated carbon fibers and its visible light photocatalytic properties

采用溶胶-凝胶法和浸渍法制备Mn掺杂TiO2负载竹质活性炭纤维(Mn/Ti-BACF)光催化复合材料,利用扫面电镜(SEM)、X射线衍射仪(XRD)、傅立叶变换红外光谱(FT-IR)、紫外-可见光分光光度计(UV-Vis)等考察了Mn掺杂量对Mn/Ti-BACF复合材料结构和可见光光催化性能的影响。结果发现,Mn掺杂改善了TiO2在竹质活性炭纤维表面的负载;Mn离子的掺杂并没有改变样品基材的碳网结构,也未出现新的Mn—O的特征吸收峰。随着Mn掺杂浓度的增加,Mn/Ti-BACF样品中TiO2粒径逐渐减小,可见光下的吸光度先增加后减少。当n(Mn)∶n(Ti)=1∶200时,样品在可见光下对亚甲基蓝的降解率达到了97.7%。

Mn-doped TiO2 loaded on bamboo based activated carbon fibers( Mn / Ti-BACF) were prepared by sol-gel and impregnationmethod. The effects of Mn doping amount on the structure andvisible light photocatalyticproperties of Mn / TiBACF were investigated by SEM,XRD,FT-IR and UV-Vis. The results show that Mn doping could improve the loading rate of TiO2 on the Mn / Ti-BACF surface. It was not found in Mn / Ti-BACF that thecarbon net constructionwas changed due to the Mn doping,and the Mn-O adsorption peak was discovered. With the Mn doping amount increasing,the TiO2 diameters in Mn / Ti-BACF gradually decreased,and the visible light absorption of Mn / Ti-BACF increased and then decreased. When the ratio of Mn to Tiin Mn / Ti-BACF was 1∶ 200,the photodegradation ratio of methylene blue was up to97. 7% under the visible light condition.