N掺杂TiO2纳米粉体的表面特性及可见光活性

材料科学与工程学报, 2011, 29(2): 161-172.

N掺杂TiO2纳米粉体的表面特性及可见光活性

姜洪泉 ^1, , 王城英 ^2, , 王鹏 ^3, , 李井申 ^4, , 卢智宇 ^5,

1.哈尔滨师范大学化学化工学院,黑龙江,哈尔滨,150025;哈尔滨工业大学市政环境工程学院绿色化学与技术研究中心,黑龙江,哈尔滨,150090

2.哈尔滨师范大学化学化工学院,黑龙江,哈尔滨,150025

3.哈尔滨工业大学市政环境工程学院绿色化学与技术研究中心,黑龙江,哈尔滨,150090

4.哈尔滨师范大学化学化工学院,黑龙江,哈尔滨,150025

5.哈尔滨师范大学化学化工学院,黑龙江,哈尔滨,150025

基金项目: 黑龙江省教育厅科学技术研究资助项目(11551115) 哈师大青年学术骨干资助计划资助项目(08XBSK89)

关键词：纳米二氧化钛 , 氮掺杂 , 表面特性 , 可见光活性

Surface Properties and Visible-light Photoactivity of N-doped TiO2 Nano-powders

旨在探究N掺杂纳米TiO2具有可见光活性的本质,采用XPS、ESR、XRD、SEM、DRS、SPS和PL分析技术对sol-gel法制备的未掺杂和N掺杂TiO2纳米粉体进行了对比研究,并以亚甲基蓝(MB)溶液在可见光下的光催化脱色评价其可见光活性.结果表明,N掺杂TiO2纳米粉体具有良好的可见光活性,未掺杂样品几乎没有可见光活性.N取代TiO2晶格中O形成了N-Ti-O和O-N-Ti键合结构产生杂质能级,N掺杂导致TiO2表面形成了大量束缚单电子的氧空位产生缺陷能级,二者协同作用致使带隙窄化,光吸收带边红移,产生可见光活性.N掺杂导致TiO2晶格中p-n结的形成及表面氧空位和表面羟基的增加均能促进光生e-/h+分离,有效抑制光生e-/h+复合,提高量子效率,进而提高其光活性.

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