摘要
The vanadium (V)-doped mesoporous titanium dioxide (TiO 2 ) nanoparticles with V/Ti ratios from 0-2 wt% were prepared using sol-gel method in the presence of triblock polymers, Pluronic F127. SEM images showed that the V-doped TiO 2 nanoparticles were porous structures. The surface areas and pore sizes were in the range 85-107m 2 /g and 12-14nm, respectively. From XRPD, the V-doped mesoporous TiO 2 after calcination at 500°C was mainly anatase phase, and the crystallite sizes were in the range 14-16 nm. TEM images showed that vanadia was doped both on the surface and in the lattice of anatase TiO 2 . A slight red-shift in wavelength absorption was observed when v/Ti ratio increased from 0 to 2wt%. Addition of vanadium ion slightly decreased the photocatalytic activity of TiO 2 toward the decolorization of MB under the illumination of UV light at 305nm. However, a 1.6-1.8times increase in rate constants for MB photodegradation was observed when 0.5-1.0wt% V-doped TiO 2 was illumined by solar simulator at AM 1.5. These results demonstrated that the doping of low concentrations of V ion into mesoporous TiO 2 enhance the photocatalytic activity of mesoporous TiO 2 towards photodecomposition of azo dye in the visible range.