期刊
ENGINEERING JOURNAL-THAILAND
卷 16, 期 3, 页码 143-151出版社
CHULALONGKORN UNIV, FAC ENGINEERING
DOI: 10.4186/ej.2012.16.3.143
关键词
Nanoparticles; Fe-doped TiO2; photocatalytic activity; modified sol-gel; visible light
资金
- Research, Development and Engineering (RD&E) fund through The National Nanotechnology Center (NANOTEC)
- National Science and Technology Development Agency (NSTDA), Thailand [P-11-00202]
- National Nanotechnology Center (NANOTEC)
- Ministry of Science and Technology
- Chiang Mai University, Thailand
- National Research University Project under Thailand's Office of the Higher Education Commission
- Materials Science Research Center
- Graduate School, Chiang Mai University
Bare TiO2 and nominal 5.0 at% Fe-doped TiO2 nanoparticles were synthesized by the modified sol-gel method. The samples were physically characterized in order to obtain the correlation between structure and photocatalytic properties by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer, Emmett and Teller (BET), and UV-vis diffuse reflectance spectrophotometry (UV-vis DRS). XRD results indicated that phase structures of bare TiO2 and Fe-doped TiO2 nanoparticles were the mixture of anatase and rutile phases. The content of rutile phase in 5.0 at% Fe-doped TiO2 nanoparticles decreased. TEM images revealed that the shape of bare and 5.0 at% Fe-doped TiO2 was almost spherical and the average particle size was in the range of 10-30 nm. Specific surface areas of the samples were found as 75 and 134 m(2)/g for bare TiO2 and nominal 5.0 at% Fe-doped TiO2, respectively. The results from UV-vis reflectance spectra clearly indicated the shift of absorption band edge towards visible region upon doping TiO2 with iron. Photocatalytic activity of bare TiO2 and 5.0 at% Fe-doped TiO2 nanoparticles was examined by studying the mineralization of oxalic acid under visible light irradiation and the results clearly showed that Fe-doped TiO2 sample exhibited higher activity than bare TiO2.
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