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Ultrasonic―hydrothermal Synthesis and Photocatalytic Activities of La―doped Mesoporous TiO2 Microspheres

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Author(s): LIU Guo-Cong, LI Hai-Bin, DONG Hui

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 26;
Issue: 7;
Start page: 739;
Date: 2011;
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Keywords: mesoporous TiO2; La-doping; methylene blue; photocatalyst

ABSTRACT
With tetrabutyl orthotitanate (TBOT) as Ti source, La(NO3)3ยท6H2O as La source and octadecylamine as a template, La―doped mesoporous TiO2 microspheres were prepared by ultrasonic―hydrothermal method. The obtained samples were characterized by XRD, XPS, TEM, BET, UV―Vis, IR and FL.The results revealed that the appropriate molar fraction of La dopant could decrease crystalline size, increase specific surface area and weaken fluorescence intensity of mesoporous TiO2. Compared with P25, the gap adsorption edge of mesoporous La3+/TiO2 exhibited a little red shift and slightly narrowed their band gaps. For mesoporous La3+/TiO2 (2.0 at%), the specific surface area and the average pore diameter were 132.7 m2/g and 8.67 nm, respectively. Furthermore, the degradation ratio of methylene blue to mesoporous La3+/TiO2 (2.0at%) was up to 98.5%, which exhibited the best photocatalytic activity with the initial concentration of 40 mg/L for 120 min.
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