The Study on DRS and Raman Spectroscopy of Surface Modified TiO2/SiO2
SANG Li-xia1,ZHONG Shun-he2,MA Chong-fang1
1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education and Key Laboratory of Heat Transfer and Energy Conversion, Beijing Education Commission, Beijing University of Technology, Beijing 100022, China 2. College of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Abstract：TiO2/SiO2 were prepared by surface reaction of silica with an acetone solution of Ti(i-OC3H7)nCl4-n,where n=0-2. Results of XRD, Raman and UV-Vis DRS showed that two types of Ti species, small particles of anatase-type TiO2 and noncrystalline TiO<i>x species, are molecularly dispersed on the silica surface. Relative to the TiO2 bulk, a blue-shift in the bandgap adsorption edge of TiO2/SiO2 was observed due to the quantum size effects. The bandgap energy (Eg) of TiO2/SiO2 is 3.96 eV. When M(Pd, Cu, Ni) is deposited on TiO2/SiO2,the adsorption spectra extend to visible light region and the bandgap adsorption edge red shifts with respect to TiO2/SiO2. Compared with that of Pd, the deposition of Cu and Ni on TiO2/SiO2 has more effects on LMCT transition (O2-→Ti4+) of Ti atoms. And the bandgap energy of Cu-TiO2/SiO2 decreases to 3.69 eV. Similarly, the photon adsorption property for visible light can be improved relatively by the incorporation of MoO3 on TiO2/SiO2,At higher MoO3 loadings, the Mo-O-Ti coupled structure can be formed through the interaction between MoO3 and TiO2,which made the bandgap energy decrease to 3.81 eV.
桑丽霞1,钟顺和2,马重芳1 . TiO2/SiO2的表面化学修饰及其DRS和Raman光谱分析[J]. 光谱学与光谱分析, 2007, 27(04): 720-724.
SANG Li-xia1,ZHONG Shun-he2,MA Chong-fang1 . The Study on DRS and Raman Spectroscopy of Surface Modified TiO2/SiO2. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(04): 720-724.
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