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

doi:10.3724/SP.J.1077.2011.00739

Abstract

Abstract: With tetrabutyl orthotitanate (TBOT) as Ti source, La(NO₃)₃·6H₂O 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.

Key words: mesoporous TiO₂, La-doping, methylene blue, photocatalyst

CLC Number:

O614

LIU Guo-Cong, LI Hai-Bin, DONG Hui. Ultrasonic-hydrothermal Synthesis and Photocatalytic Activities of La-doped Mesoporous TiO₂ Microspheres[J]. Journal of Inorganic Materials, 2011, 26(7): 739-746.

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

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