摘要
采用溶胶-凝胶法和分子印迹技术,以尿素为氮源、罗丹明B为模板分子制备了氮掺杂罗丹明B分子印迹TiO_2粉末(N-TiO_2-RhB),并对样品进行了XRD、UV-Vis DRS和BET表征。表征结果显示:氮掺杂和分子印迹一定程度改善了样品的孔隙结构和孔径分布,N-TiO_2-RhB的比表面积和孔体积分别为TiO_2的1.9倍和1.5倍;氮掺杂使TiO_2的光吸收带边发生红移,而分子印迹不能改变催化剂的光吸收带边。N-TiO_2-RhB具有最佳的可见光活性和选择性,对罗丹明B的降解率高达92.7%。对罗丹明B、罗丹明6G、甲基紫和甲基绿的降解过程均符合一级反应动力学方程。
Using urea as nitrogen source and Rhodamine B as template molecule, Rhodamine B molecular imprinting N-doped titanium dioxide （N-TiO2-RhB） powder was prepared by sol-gel method and molecular imprinting technique, and characterized by XRD, UV-Vis DRS and BET. The results showed that： The pore structure and pore size distribution of the sample were improved by doping and molecular imprinting; The specific area and pore volume of N-TiO2-RhB were 1.9 and 1.5 times as large as TiO2; N-doping led to red shift of TiO2 absorption edge, while molecular imprinting can＇ t change the optical absorption edge of the catalyst. N-TiO2-RhB had the best photocatalytic activity and selectivity under visible-light, the degradation rate of Rhodamine B was up to 92.7% by it. The degradation processes of Rhodamine B, Rhodamine 6G, methyl violet and methyl green all accorded with the first order reaction kinetics equation.
出处
《化工环保》
CSCD
北大核心
2017年第4期454-459,共6页
Environmental Protection of Chemical Industry
基金
国家自然科学基金项目(21506041)
贵阳市科技局筑科合同项目(20141021)
关键词
二氧化钛
氮掺杂
分子印迹
可见光
选择性
罗丹明B
titanium dioxide
nitrogen-doped
molecular imprinting
visible light
selectivity
Rhodamine B
