催化学报

催化学报 ›› 2013, Vol. 34 ›› Issue (6): 1250-1255.DOI: 10.1016/S1872-2067(12)60578-6

• 研究论文 • 上一篇    下一篇

超声波制备介孔结构的氮掺杂TiO2纳米晶及其可见光催化性能

周晚琴a, 余长林b, 樊启哲b, 魏龙福b, 陈建钗b, YU Jimmy Cc   

  1. a 江西理工大学信息工程学院, 江西赣州341000;
    b 江西理工大学冶金与化学工程学院, 江西赣州341000;
    c 香港中文大学化学系, 香港
  • 收稿日期:2013-01-18 修回日期:2013-03-15 出版日期:2013-06-07 发布日期:2013-06-09
  • 通讯作者: 余长林
  • 基金资助:

    国家自然科学基金(21067004, 21263005); 江西省教育厅科技基金(GJJ12344); 江西省青年科学家培养项目(20122BCB23015); 国家留学基金(2011836054).

Ultrasonic fabrication of N-doped TiO2 nanocrystals with mesoporous structure and enhanced visible light photocatalytic activity

ZHOU Wanqina, YU Changlinb, FAN Qizheb, WEI Longfub, CHEN Jianchaib, YU Jimmy Cc   

  1. a School of Information Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China;
    b School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China;
    c Department of Chemistry, The Chinese University of Hong Kong, Hong Kong, China
  • Received:2013-01-18 Revised:2013-03-15 Online:2013-06-07 Published:2013-06-09
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21067004, 21263005), the Science and Technology Project of the Education Department of Jiangxi Province (GJJ12344), the Young Scientists Cultivating Program of Jiangxi Province (20122BCB23015), and the China Scholarship Council (2011836054).

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摘要：

采用超声波辐射法制备了具有介孔结构的高浓度氮掺杂TiO2纳米晶(N/TiO2).采用N2物理吸附、X射线粉末衍射、X射线光电子能谱、透射电镜、光致发光谱和紫外-可见漫反射光谱等手段对N/TiO2进行了表征.以波长为400~660nm的可见光为光源,以水体污染物邻苯二甲酸二甲酯为降解对象,考察了不同制备方法对N/TiO2光催化性能的影响.结果表明,超声波辐射使氮掺杂浓度提高了2.2倍,该法制备的N/TiO2同时具有较好的介孔结构,表现了更高的光催化降解邻苯二甲酸二甲酯的活性.其活性提高的主要原因是N/TiO2含有更高浓度的氮和对可见光具有更强的吸收能力.

关键词: 氮掺杂, 乙二胺, 二氧化钛纳米晶, 超声波, 邻苯二甲酸二甲酯

Abstract:

An ultrasonic method was developed to fabricate novel mesoporous TiO2 nanocrystals doped with a high concentration of N (N/TiO2). The nanocrystals were characterized by physicochemical methods including N2 physical adsorption/desorption, X-ray diffraction, X-ray photoelectron spectroscopy, photoluminescence spectroscopy, transmission electron microscopy, and UV-Vis diffuse reflectance spectroscopy. The photocatalytic degradation of dimethyl phthalate, a hazardous chemical in water, by the prepared N/TiO2 nanocrystals under visible light irradiation (400?660 nm) was investigated. The results show that N-doping efficiency under ultrasonic irradiation is 3.2 times higher than under typical conditions, and the produced TiO2 nanocrystals have mesoporous structure. N/TiO2 fabricated under ultrasound exhibited much higher efficiency for the degradation of dimethyl phthalate than that prepared under typical conditions. The high photocatalytic degradation activity of N/TiO2 fabricated under ultrasound is mainly attributed to its high N content effectively increasing its ability to absorb visible light.

Key words: Nitrogen doping, Ethylene diamine, Titania nanocrystal, Ultrasound, Dimethyl phthalate