具有可见光催化活性的含氮TiO_2的制备及表征  

Preparation,Characterization and Visible Light Photocatalytic Activity of N-doped TiO_2

作　　者：邹婷[1] 关新新[1] 沈雯雯[1] 

机构地区：[1]郑州大学化学系工业催化研究所,郑州450001

出　　处：《郑州大学学报（理学版）》2009年第4期79-83,共5页Journal of Zhengzhou University:Natural Science Edition

摘　　要：以钛酸丁酯为钛源,尿素为氮源,采用水解法制得白色前驱物,450℃焙烧得到黄色掺氮TiO2粉末.采用XRD、元素分析、BET测定、UV-Vis和XPS对催化剂进行了表征.所制得含氮TiO2为锐钛矿相结构,晶粒大小为12.8 nm,比表面积为70.8 m2/g,N质量分数为0.32%.UV-Vis和XPS测试结果表明,N掺杂能使TiO2的吸收带边红移至400-550 nm的可见光区,N以Ti—N键的形式存在于TiO2晶格中.以氙灯为光源模拟太阳光降解亚甲基蓝,对催化剂的可见光催化活性进行了测试,结果表明,制得的含氮TiO2具有较高的可见光催化活性,亚甲基蓝的降解率达93.7%.Nitrogen-doped TiO2 photocatalyst is prepared by a simple hydrolysis method using tetrabutyl titanate as titanium source and urea as nitrogen source,followed by calcination at 450 ℃.The obtained catalysts exhibit photocatalytic activity in simulated sunlight due to N doping.The light absorption edge of N-doped TiO2 is shifted to the visible light region compared to pure TiO2 characterized by UV-Vis absorption spectroscopy.N-doped TiO2 powders are characterized to be anatase by XRD;its crystallite size is about 12.8 nm,and the specific surface area is 70.8 m2/g. The result of element analysis reveals N content of N-doped TiO2 is 0.32%, and N atoms assigned to Ti-N bond in TiO2 crystal lattice. The photocatalytic activity of samples is evaluated by the degradation rate of methylene blue under Xe lamp irradiation. The results indicate that N-doped TiO2 exhibits higher visible light activity ; the highest degradation rate of methylene blue is 93.7 %.

关 键 词：水解法 N掺杂TIO2 光催化 可见光 

分 类 号：TQ134.11[化学工程—无机化工]