Showing papers by "Jeffrey C.S. Wu published in 2004"
TL;DR: In this article, a series of vanadium-doped TiO 2 catalysts were synthesized by two modified sol-gel methods, and the TEM micrographs showed the sizes of primary particles were in the range of 6-20nm.
Abstract: A series of vanadium-doped TiO 2 catalysts were synthesized by two modified sol–gel methods. V-doped TiO 2 was found to be mainly preserved its anatase phase after calcination at 400 °C. The TEM micrographs showed the sizes of primary particles were in the range of 6–20 nm. The increase of vanadium doping promoted the particle growth, and enhanced “red-shift” in the UV-Vis absorption spectra. The XPS (X-ray photoelectron spectroscopy) could not detect vanadium indicating negligible vanadium on the surface of catalysts, furthermore, there were also no peak of vanadium oxide in the XRD patterns. XAS (X-ray absorption spectroscopy) analysis indicating V 4+ instead of V 5+ implied that vanadium either substituted Ti 4+ site or embedded in the vacancy of TiO 2 structure. Therefore, vanadium was concluded to be highly dispersed inside the TiO 2 structure. The photocatalytic activity was evaluated by the degradation of crystal violet (CV) and methylene blue (MB) under visible light irradiation. The degradation rate of CV and MB on V-doped TiO 2 were higher than those of pure TiO 2 . As the results, V-doped TiO 2 possessed better absorption ability of visible light.
427 citations
TL;DR: In this article, a modified sol-gel process was used to synthesize copper-loaded titania (Cu/TiO2) catalysts for CO 2 photocatalytic reduction and the yield of methanol was evaluated.
399 citations
TL;DR: In this article, various solgel procedures and post-treatments were applied to modify the distribution of Cu on the surface of Cu/TiO 2 catalysts in order to increase the production of methanol in the photoreduction of CO 2.
139 citations
7 citations