Optimization of the photocatalytic properties of titanium dioxide

Photoelectrochemical behavior of composite metal oxide semiconductor films with a WO3 matrix and occluded Degussa P 25 TiO2 particles

“…The latter parameter was obtained from deconvolution of the characteristic Raman bands for each phase: 385, 512, and 645 cm À1 for anatase and 447 and 612 cm À1 for rutile, respectively [30][31][32][33][34][35]. In essential agreement with previous studies [7][8][9][10][11][12][13][14], the conversion to rutile becomes significant at temperatures higher than $700°C and at 800°C, all of the anatase is converted to the rutile phase ( Fig. 3(b)).…”

“…Raman spectroscopic monitoring of the anatase-to-rutile conversion X-ray diffraction has been deployed in many of the previous studies for monitoring the effect of calcination of TiO 2 [9,13,14]. Other techniques include measurement of the surface area, electron microscopy, and photoconductance [10,11,14].…”

“…rutile polymorphic transition at temperatures above ca. 500°C, see below) also influences the oxide particle morphology (via for e.g., sintering) and the surface chemistry (e.g., the extent of hydroxylation) [7][8][9][10][11][12][13][14]. It was of interest to probe how these variables manifested in the photoelectrochemical behavior of the oxide particles when they were occluded in another oxide (e.g., WO 3 ) film matrix.…”

Photocatalytic degradation of diuron in aqueous solution by platinized TiO2

“…In order to solve these problems, one of the approaches is that noble metals are doped onto TiO 2 surface. Many investigators have demonstrated that the photocatalytic activity may be enhanced by impregnating the surface of titanium dioxide with noble metals [21][22][23][24].…”

TiO2, TiO2/Ag and TiO2/Au photocatalysts prepared by spray pyrolysis

“…12 Metal deposits can facilitate transfer of excited electrons to a metal particle and trap them in a Schottky barrier, 11 hence increased photocatalytic activity is found for incorporations such as Ag, [13][14][15] Au, [16][17][18][19][20] Pd 17 and Pt. 17,21 For photocatalytic studies the commercial photocatalyst P25 7,8,22 from Evonik Degussa is usually employed, either unmodified or as a starting material for metal deposited TiO 2 . 17,19 TiO 2 photocatalysts have also been prepared by sol-gel routes, 13,15,23,24 by use of colloidal TiO 2 11 and solvothermal methods.…”