Characterization and photocatalytic activity of vanadium-doped titanium dioxide nanocatalysts.
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 85-107 m(2)/g and 12-14 nm, respectively. From XRPD, the V-doped mesoporous TiO(2) after calcination at 500 degrees 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 2 wt%. Addition of vanadium ion slightly decreased the photocatalytic activity of TiO(2) toward the decolorization of MB under the illumination of UV light at 305 nm. However, a 1.6-1.8 times increase in rate constants for MB photodegradation was observed when 0.5-1.0 wt% 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.
Chang
Pei-Yi
PY
Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu, Taiwan.
Huang
Chun-Hsin
CH
Doong
Ruey-An
RA
D002384:Catalysis / Q000528:radiation effects; D008751:Methylene Blue / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D055620:Optical Phenomena; D016062:Porosity / Q000528:radiation effects; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties / Q000528:radiation effects; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014639:Vanadium / Q000737:chemistry*
D014639:Vanadium; C009495:titanium dioxide; D014025:Titanium; D008751:Methylene Blue