催化学报

催化学报 ›› 2006, Vol. 27 ›› Issue (8): 697-702.

• 研究论文 • 上一篇    下一篇

酸催化水解法制备可见光响应N掺杂纳米TiO2催化剂

刘守新,陈孝云,陈曦   

  1. 东北林业大学材料科学与工程学院, 黑龙江哈尔滨 150040
  • 收稿日期:2006-08-25 出版日期:2006-08-25 发布日期:2010-09-28

Preparation of N-Doped Visible-Light Response Nanosize TiO2 Photocatalyst Using the Acid-Catalyzed Hydrolysis Method

LIU Shouxin*, CHEN Xiaoyun, CHEN Xi   

  1. College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, Heilongjiang, China
  • Received:2006-08-25 Online:2006-08-25 Published:2010-09-28

PDF

865

被引次数

213

摘要： 以TiCl4为钛源,采用酸催化水解法合成了TiO2前驱体,在NH3/N2气氛中经程序升温处理制得不同N掺杂量的TiO2可见光响应催化剂. 以苯酚为模型物,考察了催化剂在可见光及紫外光区的催化活性. 采用X射线衍射、紫外-可见漫反射光谱、傅里叶变换红外光谱、扫描电镜和低温氮物理吸附对光催化剂的晶相结构、光谱特征和表面结构进行了表征. 结果表明,掺杂N后锐钛矿TiO2的可见光催化活性显著提高,在500 ℃焙烧5 h制得的催化剂在可见光区及紫外光区均表现出最高的光催化活性. N掺杂对TiO2的晶粒大小、比表面积和晶相结构影响不大. 适量N掺杂可在TiO2表面形成Ti-O-N键,形成了新的能级结构,使催化剂的吸收带边红移至490～550 nm; 同时该结构也可有效提高TiO2的紫外光催化活性.

关键词: 二氧化钛, 氮, 掺杂, 可见光, 光催化剂, 苯酚, 降解

Abstract: The N-doped visible-light response nanosize TiO2 photocatalyst was prepared using the acid-catalyzed hydrolysis method followed by calcination in an NH3/N2 atmosphere. The photocatalytic activity of the prepared N-doped TiO2 for phenol degradation was investigated under visible and UV light irradiation, respectively. X-ray diffraction, UV-Vis diffuse reflectance spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, and N2 adsorption were used to characterize the catalyst. The results showed that the N-doped TiO2 catalyst displayed obvious photocatalytic activity under visible light irradiation. The N-doped TiO2[KG20x] catalyst calcined at 500 ℃ for 5 h exhibited the highest activity in both UV and visible light regions. N-doping showed little effect on the crystalline structure, surface area, and crystal size of TiO2. The Ti-O-N bond formed on the surface of the catalyst could extend the absorption edge to the visible light region (490-550 nm) and also benefit the photocatalytic acitivity of TiO2 under UV irradiation. The newly formed Ti-O-N bonds and the reduced agglomeration of the single crystals were mainly responsible for the high activity of the N-doped TiO2 in both UV and visible light regions.

Key words: titania, nitrogen, doping, visible light, photocatalyst, phenol, degradation