催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (11): 987-992.

• 研究论文 • 上一篇    下一篇

铬和硫共掺杂二氧化钛催化剂的制备及其可见光催化性能

吕媛1,倪伶俐1,杨平1,曹勇2   

  1. 1 华东师范大学化学系, 上海 200062; 2 复旦大学上海市分子催化和功能材料重点实验室, 上海 200433
  • 收稿日期:2007-11-25 出版日期:2007-11-25 发布日期:2011-10-13

Preparation of Chromium and Sulfur Co-doped TiO2 Photocatalysts and Their Photocatalytic Activity under Visible Irradiation

Lv Yuan1, NI Lingli1, YANG Ping1*, CAO Yong2   

  1. 1 Chemistry Department, East China Normal University, Shanghai 200062, China; 2 Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
  • Received:2007-11-25 Online:2007-11-25 Published:2011-10-13

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摘要： 以钛酸四丁酯为前驱体,硝酸铬和硫脲为掺杂离子给体,通过溶胶-凝胶法成功制备了纯TiO2、不同浓度的铬掺杂和铬/硫共掺杂TiO2光催化剂. 以靛红为目标污染物,进行了可见光催化降解活性测试实验. 结果表明,共掺杂催化剂的活性高于未掺杂和单掺杂催化剂. 当共掺杂催化剂含0.60%(原子比)的铬, 1.2%(原子比)的硫,焙烧温度为500 ℃时具有最高的光催化降解活性. X射线衍射、N2吸附、X射线光电子能谱和紫外-可见漫反射吸收光谱表征结果显示,共掺杂催化剂为锐钛矿型,具有较高的比表面积,对可见光有较强的吸收能力. 共掺杂TiO2具备较高可见光催化活性的原因可能是铬掺杂降低了TiO2的禁带宽度,拓展了可见光吸收区域,而硫掺杂能够维持体系的电荷平衡,增强催化剂对可见光的吸收.

关键词: 铬, 硫, 共掺杂, 二氧化钛, 可见光, 光催化降解, 靛红

Abstract: Pure and doped or co-doped TiO2 catalysts with various amounts of chromium and sulfur were obtained by the sol-gel process, in which tetrabutyl titanate was used as the precursor and chromium nitrate and thiourea as ion donors. Indigo carmine photodegradation experiments showed that the co-doped catalyst has higher photocatalytic activity than that of pure and single-doped ones. The co-doped catalyst with 0.60% (atomic ratio) chromium and 1.2% (atomic ratio) sulfur calcined at 500 ℃ has the highest catalytic efficiency under visible irradiation. The catalysts were characterized byX-raydiffraction, N2 adsorption,X-rayphotoelectron spectroscopy, and ultraviolet-visible diffuse reflectance spectroscopy. The results showed that the co-doped catalysts have anatase phase, higher specific area, and wide range of visible response. The higher visible light photocatalytic activity of the co-doped TiO2 is attributed to the doped chromium and sulfur. The doped chromium lowers the band gap and expands the absorption of visible light region, and the doped sulfur maintains the charge balance and enhances visible light absorption.

Key words: chromium, sulfur, co-doping, titania, visible light, photodegradation, indigo carmine