期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 126, 期 1-2, 页码 167-177出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2010.11.044
关键词
Amorphous titanium dioxide; Doped TiO2; Photocatalyst; Dye degradation
资金
- Center for Innovation in Chemistry (PERCH-CC), Commission on Higher Education, Ministry of Education
- Songklanagarind Scholarship for Graduate Studies
- Graduate School, Prince of Songkla University
Samples of amorphous TiO2 doped with Cr(III) and Fe(III), designated as Cr-TiO2 and Fe-TiO2, were prepared via modified impregnation method. The resulting products were characterized by X-ray diffraction, scanning electron microscopy, specific surface area by the Brunauer, Emmett and Teller method, UV-vis absorption and diffuse reflectance spectroscopy, and electron spin resonance spectroscopy. Experimental results revealed that the concentrations of dopants under studied, from 0.05 to 0.2 mol%, had no effect on the phase of products. The band gap energies shifted from 3.28 eV in the undoped amorphous TiO2 to 2.50 eV and 2.86 eV for Fe-TiO2 and Cr-TiO2, respectively. The doped amorphous TiO2 showed photocatalytic activities under both UV and visible light with optimal results at 0.1 mol% dopants. Under UV irradiation, the 0.1 mol% doped samples decolorized methylene blue solutions to the same extent as the commercial TiO2 samples (P25 and anatase) in 5 h. Under visible light, the doped samples decolorized dye solutions in 12 h while the commercial ones were much less active. The used catalysts can be recycled many times without any special treatment. (C) 2010 Elsevier B.V. All rights reserved.
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