Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

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第18卷    第5期    总第110期    2008年5月

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文章编号:1004-0609(2008)05-0884-06
S掺杂纳米TiO2的可见光响应机制
许珂敬,尚超峰,李 芳

(山东理工大学 材料科学与工程学院,淄博 255049)

摘 要: 以硫脲为S的源物质,以钛酸丁酯为TiO2的前驱体,采用溶胶凝胶法制备S-TiO2光催化剂。利用XRDXPSFTIR等技术分析S掺杂对TiO2晶格结构的影响,并探讨元素STiO2晶格中的化学状态以及所形成的化学键的类型。结果表明:掺杂的SS4+进入TiO2晶格中取代部分Ti4+,形成Ti1−xSxO2催化剂;S4+TiO2的价带上形成1个电子占据能级,价带上的电子占据能级的价带顶位主要由S3p态构成,同时S3p也有助于形成1个由Ti3dO2p态构成的导带,S3p态与价带的交叉使价带变宽,导致能带变窄,从而改善TiO2的光谱响应,使吸收边缘扩展到可见光的区域。对亚甲基蓝的光降解实验结果证实硫掺杂明显提高了光催化活性。

 

关键字: S-TiO2光催化剂;掺杂机制;化学状态;可见光;吸收活性

Mechanism of sulfur-doping on TiO2 photo-response under visible light
XU Ke-jing, SHANG Chao-feng, LI Fang

School of Materials Science and Technology, Shandong University of Technology, Zibo 255049, China

Abstract:S-TiO2 photocatalysts, with thiourea as source substance of S and titanium tetrabutoxide (Ti(OC4H9)4 as precursor of titanium dioxide, were prepared by sol-gel method. The effects of sulfur-doping on TiO2 crystal structure, the chemical states of S atom in TiO2 crystals and the chemical bonds formed in TiO2 were analyzed by XRD, XPS and FTIR. The results show that S atom as the state of S4+ in TiO2 crystal lattices substitutes part of Ti atoms and form Ti1−xSxO2 catalyst, and S4+ forms an electron-occupied level in valence band (VB), and the electron occupies level above the VB consists of S3p states, at the same time, the S3p states contribute to the formation of a conduction band with Ti3d and O2p states, the chiasma of S3p states and the VB make VB broaden and result in energy gap narrow down, and then improve the optical response of TiO2 and extend its absorption edge into the visible-light region.

 

Key words: S-TiO2 photocatalyst; doping mechanism; chemical state; visible light; absorption activity

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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