[Comparative studies on the spectral behavior between SO4(2-)/TiO2 and TiO2 photocatalysts].
The differences of spectral behavior between SO4(2-)/TiO2 and TiO2 photocatalysts were studied by using IR, Raman as well as UV-Vis diffuse reflectance spectroscopy(DRS). The results showed that both L and B acid sites exist on SO4(2-)/TiO2 photocatalyst while only L acid sites on TiO2 photocatalyst. As compared with unmodified TiO2, the sulfated TiO2 (SO4(2-)/TiO2) exhibits higher resistance to crystal phase transition from anatase to rutile, higher resistance to growth of crystal grain. As the results of sulfation, SO4(2-)/TiO2 samples possess higher anatase content, smaller crystal grain, and the blue-shifted band edge of adsorption spectra, which increases the optical absorption threshold value and yield larger redox potential.
Su
W
W
Research Institute of Photocatalysis, Fuzhou University, 350002 Fuzhou.
Fu
X
X
Wei
K
K
D000327:Adsorption; D000393:Air Pollutants / Q000032:analysis; D002384:Catalysis; D008027:Light; D010084:Oxidation-Reduction; D010777:Photochemistry; D010782:Photolysis; D013057:Spectrum Analysis / Q000379:methods; D013431:Sulfates / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
D000393:Air Pollutants; D013431:Sulfates; C009495:titanium dioxide; D014025:Titanium