高压辅助溶胶-凝胶法制备La掺杂TiO<sub>2</sub>光催化剂及其可见光降解甲基橙研究

doi:10.11896/cldb.22080236

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Abstract Based on the advantages and disadvantages of the sol-gel method and hydrothermal method in TiO₂ preparation, a high pressure assisted sol-gel method was developed for the controllable preparation of La doped TiO₂. Anatase La doped TiO₂ with high purity and good dispersion was successfully prepared by this method. By the control of La doping ratios (0.05%, 0.10%, 0.15%, 0.20%, 0.25%), the band gap of La doped TiO₂ can be adjusted in a range of 3.15—2.80 eV, and the 0.20%La doped TiO₂ (0.20%La-TiO₂) had a narrowest band gap of 2.80 eV. The photocatalytic experiments of methyl orange (MO) degradation showed that 0.20%La-TiO₂ has higher photocatalytic activity than the others La doped TiO₂ and the pristine TiO₂. In the 0.20%La-TiO₂-based reaction system, the degradation rate of MO under visible light irradiation could reach 92% within 160 min. The photocatalytic activity of 0.20%La-TiO₂ is 38.30 times higher than that of the pristine TiO₂. The as-developed high pressure assisted sol-gel method in the present work could provide a useful method and condition reference for the preparation of highly active TiO₂-based photocatalysts.

Key words： photocatalytic activity La doped TiO₂ anatase high pressure assisted sol-gel process

Published: 25 January 2024 Online: 2024-01-26

CLC number:

O643.3

Fund:Research Foundation of Chongqing University of Science and Technology (ckrc2022003).

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	Articles by authors
	WANG Xueyi
	WANG Zhiyuan
	YU Wei
	ZHOU Bingxin
	XU Rong
	YANG Xingdong
	HE Huichao
	JIA Bi

Cite this article:

WANG Xueyi,WANG Zhiyuan,YU Wei, et al. Preparation of La Doped TiO₂ Photocatalyst by High Pressure Assisted Sol-Gel Method and Its Visible Light Degradation of Methyl Orange[J]. Materials Reports, 2024, 38(2): 22080236-5.

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http://www.mater-rep.com/EN/10.11896/cldb.22080236 OR http://www.mater-rep.com/EN/Y2024/V38/I2/22080236

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