Effect of the addition of a small amount of vanadium on the photocatalytic activities of N- and Si- co-doped titanias under visible-light irradiation

Abstract

Si-doped titanias with a Si/Ti charged ratio of 0.2 was prepared by thermal reactions of titanium tetraisopropoxide and tetraethyl orthosilicate in 1,4-butanediol at 300°C (glycothermal reaction) and N-and Si-co-doped titanias were prepared by heating the thus-obtained Si-doped titanias in an NH 3 flow. N-and Si-co-doped titanias had a stronger absorption in a visible light region of 400-550 nm, and exhibited high photocatalytic activities for decomposition of acetaldehyde under visible-light irradiation. In this study, N-and Si-co-doped titanias were further modified with vanadium by an impregnation method using an ammonium vanadate solution, and the obtained catalysts were characterized by XRD, BET surface area measurement, UV-vis, and ESR. Photocatalytic decomposition of acetaldehyde using the V-loaded N-and Si-co-doped titanias was examined and it was demonstrated that a very small amount of V-loading (V/Ti = 0.0001-0.001) significantly enhanced the photocatalytic activity under visible-light irradiation.

Mixed phase titania nanocomposite codoped with metallic silver and vanadium oxide: New efficient photocatalyst for dye degradation

“…3a, V-TiO 2 -(0, 4.8) sample exhibits absorption in the range of 200-600 nm and extends to 800 nm. It has been reported that V 5+ shows absorption lower than 570 nm and that V 4+ has an absorption band centered at 770 nm [35], therefore, the electron spectrum of V-TiO 2 -(0, 4.8) suggests co-existence of V 5+ and V 4+ species in the composite, consistent with the XPS result. The tailing of the absorption band of V-TiO 2 -(0, 4.8) can be assigned to the CT transition from the 3d orbitals of V 4+ species to the Ti 3d orbitals of TiO 2 [36].…”

Microstructural and photocatalytic properties of sol–gel-derived vanadium-doped mesoporous titanium dioxide nanoparticles

“…The V/Ti ratios used in this study ranged between 0 and 2 wt%. Previous studies have reported that addition of vanadium ions can enhance the photoactivity of TiO 2 under illumination of visible-light [28,33]. To elucidate the photocatalytic activity of the sol-gel-derived V-doped TiO 2 nanoparticles, sunlight at AM 1.5 generated from solar simulator was used to investigate the effect of vanadium ion on photocatalytic activity of mesoporous TiO 2 nanoparticles in the visible-light region.…”

First principles calculations of electronic and optical properties of Mo-doped rutile TiO2

“…In recent years, impurity doping has been widely performed by chemical synthesis and other methods in order to improve photoactivity [3][4][5][6][7][8][9][10][11][12]. Theoretical investigations have also been carried out to study the band structures of TiO 2 phases including anatase [13][14][15] and rutile [16][17][18][19][20].…”