Preparation, photocatalytic activity, and mechanism of Nano-TiO2 co-doped with nitrogen and iron (III)

被引:489
作者
Cong, Ye
Zhang, Jinlong
Chen, Feng
Anpo, Masakazu
He, Dannong
机构
[1] E China Univ Sci & Technol, Lab Adv Mat, Shanghai 200237, Peoples R China
[2] E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China
[3] Osaka Prefecture Univ, Grad Sch Engn, Dept Appl Chem, Sakai, Osaka 5998531, Japan
[4] Shanghai Natl Engn Res Ctr Nanotechnol, Shanghai 200237, Peoples R China
关键词
D O I
10.1021/jp0727493
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Nanoparticles of titanium dioxide co-doped with nitrogen and iron (III) were first prepared using the homogeneous precipitation-hydrothermal method. The structure and properties of the co-doped were studied by XRD, XPS, Raman, FL, and UV-diffuse reflectance spectra. By analyzing the structures and photocatalytic activities of the undoped and nitrogen and/or Fe3+-doped TiO2 under ultraviolet and visible light irradiation, the probable mechanism of co-doped particles was investigated. It is presumed that the nitrogen and Fe3+ ion doping induced the formation of new states closed to the valence band and conduction band, respectively. The co-operation of the nitrogen and Fe3+ ion leads to the much narrowing of the band gap and greatly improves the photocatalytic activity in the visible light region. Meanwhile, the co-doping can also promote the separation of the photogenerated electrons and holes to accelerate the transmission of photocurrent carrier. The photocatalyst co-doped with nitrogen and 0.5% Fe3+ shows the best photocatalytic activity, the degradation efficiencies of which were improved by 75% and 5% under visible and ultraviolet irradiation, respectively, compared with the pure titania.
引用
收藏
页码:10618 / 10623
页数:6
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