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Acta Phys. Chim. Sin.  2012, Vol. 28 Issue (08): 1978-1984    DOI: 10.3866/PKU.WHXB201205172
CATALYSIS AND SURFACE SCIENCE     
Visible Light Photocatalytic Properties of Bi3.25La0.75Ti3O12 Nanowires
LIN Xue1,2, Lü Peng1, GUAN Qing-Feng1, LI Hai-Bo3, LI Hong-Ji2, CAI Jie1, ZOU Yang1
1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu Porvnce, P. R. China;
2. College of Chemistry, Key Laboratory of Preparation and Application Environmentally Friendly Materials of the Ministry of Education, Jilin Normal University, Siping 136000, Jilin Porvnce, P. R. China;
3. College of Physics, Jilin Normal University, Siping 136000, Jilin Porvnce, P. R. China
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Abstract  

Lanthanum-doped bismuth titanate (Bi3.25La0.75Ti3O12, BLT) nanowires were synthesized by a one-step hydrothermal process and their optical and photocatalytic properties were investigated. Their crystal structure and microstructures were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). The BLT nanowires obtained are single-phase with an average diameter of 25 nm. The room temperature photoluminescence (PL) spectrum reveals two visible emission peaks at 400 and 596 nm, which are assigned to excitonic and surface-defect emissions, respectively. The UV-visible diffuse reflectance spectrum (UV-Vis DRS) reveals that the band gap of BLT nanowires is 2.07 eV. The prepared BLT nanowires are stable and exhibit higher photocatalytic activities in the degradation of methyl orange (MO) under visible light irradiation (λ >420 nm) compared with commercial P25 TiO2, traditional N-doped TiO2 (N-TiO2), and pure bismuth titanate (Bi4Ti3O12, BIT). The high photocatalytic performance of BLT photocatalysts is attributed to the strong visible light absorption and the recombination restraint of the e-/h+ pairs resulting from the presence of La3+ ions.



Key wordsBismuth titanate      Lanthanum doping      Nanowire      Hydrothermal synthesis      Photocatalytic degradation      Visible light irradiation     
Received: 09 April 2012      Published: 17 May 2012
MSC2000:  O643  
Fund:  

The project was supported by the Key Laboratory of Preparation and Application Environmentally Friendly Materials of the Ministry of Education of China.

Corresponding Authors: GUAN Qing-Feng     E-mail: guanqf@ujs.edu.cn
Cite this article:

LIN Xue, Lü Peng, GUAN Qing-Feng, LI Hai-Bo, LI Hong-Ji, CAI Jie, ZOU Yang. Visible Light Photocatalytic Properties of Bi3.25La0.75Ti3O12 Nanowires. Acta Phys. Chim. Sin., 2012, 28(08): 1978-1984.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB201205172     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2012/V28/I08/1978

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