Citation: LI Hui-Quan, CUI Yu-Min, WU Xing-Cai, HONG Wen-Shan, HUA Lin. Effect of La Contents on the Structure and Photocatalytic Activity of La-SrTiO₃ Catalysts[J]. Chinese Journal of Inorganic Chemistry, ;2012, 28(12): 2597-2604. shu

Effect of La Contents on the Structure and Photocatalytic Activity of La-SrTiO₃ Catalysts

LI Hui-Quan ^1,2 ,
CUI Yu-Min ^1,2,, ,
WU Xing-Cai ^3,, ,
HONG Wen-Shan ¹ ,
HUA Lin ⁴

1.
1. School of Chemistry and Chemical Engineering, Fuyang Normal College, Fuyang, Anhui 236041, China;

Corresponding author: CUI Yu-Min, WU Xing-Cai,
Received Date: 15 April 2012
Available Online: 29 May 2012
Fund Project: 国家自然科学基金(No.21171091) (No.21171091)安徽省高校省级自然科学研究课题(KJ2012A217,KJ2012B136)资助项目. (KJ2012A217,KJ2012B136)

La-doped SrTiO₃ catalysts with different La contents were prepared by a sol-gel method, and characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectra (UV-Vis DRS), and low temperature nitrogen adsorption. The photocatalytic activities were evaluated by photo-degradation of methyl orange (MO). The results show that La-doped SrTiO₃ keeps a perovskite structure and the absorption edge of 0.5% La-SrTiO₃ sample is obviously red-shifted. There is no big difference between pure SrTiO₃ and 0.5% La-SrTiO₃ samples in particle size and morphologies. With the increase of La content, the photocatalytic activities of La-SrTiO₃ samples under UV and visible light irradiation first increase, reaching a maximums around La content of 0.5%, and then decrease with further increasing La. Compared with pure SrTiO₃, the 0.5% La-SrTiO₃ sample obviously exhibits much higher UV and visible light photocatalytic activity. The enhanced photocatalytic activity can be mainly attributed to the increase of BET surface area, the enhancement in adsorption performance, the stronger absorption in 250~650 nm light region and the lower band-gap energy level.
- sol-gel method;La-doped;SrTiO₃;photocatalysis
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Effect of La Contents on the Structure and Photocatalytic Activity of La-SrTiO3 Catalysts

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通讯作者: 陈斌, bchen63@163.com

Effect of La Contents on the Structure and Photocatalytic Activity of La-SrTiO₃ Catalysts