高结晶度氮掺杂介孔TiO2的制备及光催化活性

催化学报 , 2012, 33(10): 1665-1671. doi: 10.1016/S1872-2067(11)60437-3

高结晶度氮掺杂介孔TiO2的制备及光催化活性

刘二强 ^1, , 郭晓玲 ^2, , 秦雷 ^3, , 申国栋 ^4, , 王向东 ^5,

1.西安交通大学理学院,陕西西安,710049

2.西安工程大学纺织与材料学院,陕西西安,710048

3.西安交通大学理学院,陕西西安,710049

4.西安工程大学纺织与材料学院,陕西西安,710048

5.西安交通大学理学院,陕西西安,710049

基金项目: the National Natural Science Foundation of China(50772082) 国家自然科学基金(50772082) 陕西高校省级重点实验室科研项目(2010JS007) the Scientific Research Project of the Provincial University 's Key Laboratory of Shaanxi Province(2010JS007)

关键词：介孔二氧化钛 , 氮掺杂 , 高结晶度 , 光催化活性 , 甲基橙

Fabrication and Photocatalytic Activity of Highly Crystalline Nitrogen Doped Mesoporous TiO2

Keywords： mesoporous titanium dioxide , nitrogen doped , high crystallinity , photocatalytic activity , methyl orange

以钛酸丁酯为钛源,尿素为氮源,聚丙烯酰胺(PAM)和聚乙二醇(PEG)为复合模板剂,采用溶胶-凝胶法,在氮气和空气气氛中分段煅烧,制得高结晶度氮掺杂介孔TiO2光催化剂.利用X射线衍射、透射电镜、N2吸附-脱附、X射线光电子能谱和紫外-可见漫反射光谱等技术对其进行了表征.结果表明,当PAM和PEG的质量比为1:4时,先在氮气中600℃煅烧,后在空气中500℃煅烧所得样品是锐钛矿相,具有良好的孔隙结构和较高的结晶度,平均孔径为5.11 nm,晶粒尺寸为12.5 nm,比表面积110.8 m2/g.掺杂介孔TiO2的氮主要以取代氮和化学吸附分子γ-N2的形式存在,少量以间隙氮形式存在.氮掺杂使TiO2的能带变窄,吸收带边明显红移,且使光吸收强度显著增大.光催化降解甲基橙实验结果表明,与未掺杂样品相比,氮掺杂介孔TiO2在可见光作用下表现出较高的催化活性.

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