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化学学报
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化学学报 ›› 2010, Vol. 68 ›› Issue (04): 301-308. 上一篇    下一篇

研究论文

可见光响应的镍硅共掺杂二氧化钛及其光催化性能

陈其凤1,2，史卫梅1,2，姜东1，徐耀*,1，吴东1，孙予罕1   

  1. (1中科院山西煤炭化学研究所 太原 030001)
    (2中国科学院研究生院 北京 100049)
  • 投稿日期:2009-07-14 修回日期:2009-08-26 发布日期:2010-02-28
  • 通讯作者: 徐耀 E-mail:xuyao@sxicc.ac.cn
  • 基金资助:

    国家自然基金

Visible-Light-Activated Ni-Si Co-Doped TiO2 with Photocatalytic Performance

Chen Qifeng1,2 Shi Weimei1,2 Jiang Dong1 Xu Yao*,1 Wu Dong1 Sun Yuhan1   

  1. (1 State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001)
    (2 Graduate University of Chinese Academy of Sciences, Beijing 100049)
  • Received:2009-07-14 Revised:2009-08-26 Published:2010-02-28

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被引次数

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为了更好地利用太阳光和提高二氧化钛的光催化性能, 以钛酸四正丁酯、正硅酸乙酯、六水合硝酸镍为原料, 在高压釜中140 ℃非水溶剂热反应, 所得材料经400 ℃焙烧制得镍硅共掺杂的二氧化钛光催化剂. 所得材料用X射线衍射、氮吸附、透射电镜、X射线光电子能谱、傅里叶变换红外光谱、紫外漫反射等测试手段分析, 结果显示所有样品均为锐钛矿型二氧化钛, Si和Ni均掺杂到TiO2体相中, 样品具有较大的比表面积, 其最大达303.3 m2•g－1. 在可见光照射下, 以降解罗丹明-B为探针反应研究其可见光催化性能, 与未掺杂和镍掺杂的二氧化钛相比较, 共掺杂的二氧化钛具有更高的可见光催化性能, 当Ni/Ti和Si/Ti的物质的量的比分别为0.01和0.20时, 可见光催化性能最好. 可见光催化性能的提高归因于镍和硅的协同作用.

关键词: 锐钛二氧化钛, 共掺杂, 非水体系, 可见光催化, 罗丹明-B

To utilize the solar light more efficiently and enhance the photocatalytic performance of TiO2, nickel and silicon co-doped TiO2 was synthesized from a compound system of tetrabutyl titanate (TBT), tetraethyl orthosilicate (TEOS) and nickel nitrate hexahydrate (NNH) at 140 ℃, which then was annealed at 400 ℃. The reaction was performed in a Teflon-lined steel autoclave with acetic acid as solvent using a non-aqueous method. The as-obtained materials were characterized by X-ray diffraction (XRD), nitrogen adsorption, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), as well as UV-visible diffuse reflectance spectroscopy (UV-vis DRS). It was found that all the as-obtained materials were of an anatase phase, which is the TiO2 phase with the highest photocatalytic activity among anatase, rutile and brookite. One sample possessed the largest surface area of 303.3 m2•g－1. Furthermore, nickel and silicon were all introduced into the bulk of TiO2. The visible photocatalytic performance of the obtained materials was evaluated by rhodamine-B decomposition. The results showed that the photocatalytic activity of Ni-Si co-doped TiO2 was higher than that of TiO2 or Ni-doped TiO2, which was enhanced with increasing the nickel and silicon contents and then decreased, reaching the maximum at the Ni/Ti and Si/Ti molar ratios of 0.01 and 0.20, respectively. The enhanced visible photocatalytic performance was attributed to the synergetic effect of nickel and silicon co-doping.

Key words: anatase TiO2, co-doping, nonaqueous system, visible photocatalysis, rhodamine-B