Photocatalytic degradation of various dyes by combustion synthesized nano anatase TiO2

Parameters affecting the photocatalytic degradation of dyes using TiO2: a review

“…Complete decolorization of the solutions took place in less than an hour for relatively low C 0 values (25-100 mg/l), while this was not the case for higher initial dye concentrations (200-600 mg/l). Other works also revealed similar result (Sakthivel et al 2003;Saquib and Muneer 2003;Augugliaro et al 2002;Sohrabi et al 2009;Sivalingam et al 2003).…”

“…They observed that the degradation of both dyes proceeds much more rapidly in the presence of Degussa P25 as compared with other TiO 2 samples. Sivalingam et al (2003) experimented with Degussa P-25 TiO 2 and combustion synthesized TiO 2 for the degradation of methylene blue under UV exposure. Complete degradation of methylene blue of initial concentration of 200 ppm with the catalyst loading of 1 kg/m 3 of combustion synthesized TiO 2 occurred in 65 min, while Degussa P-25 showed reduction in concentration up to 100 ppm under identical conditions.…”

Photocatalytic activity of silver-modified titanium dioxide at solid–liquid and solid–gas interfaces

“…There was also observed, that some metals on TiO 2 surface can have no influence or even a detrimental effect on the photocatalytic degradation of investigated organic pollutants [1,7]. According to a possible explanation for this negative impact presented in the literature metal deposits may occupy the active sites on the TiO 2 surface at higher loadings causing the photocatalyst to lose its activity.…”

“…The effect of the doping agent in the degradation efficiency is not evident. Positive effect of additives in the decomposition of different organic compounds has been published [2][3][4][5][6][7][8][9], but opposite results have been also reported [1,7,9]. This miscellaneous behaviour can be explained by the difference in the morphology, crystal structure, specific surface area and the surface density of the OH groups of the studied TiO 2 catalysts, due to the various preparation methods applied in their synthesis [22].…”

“…photosensitization) resulting in enhanced photocatalytic activity is one of the most important aspects of heterogeneous photocatalysis. Deposition of different metals (like Pt, Pd, Au, Ag, Fe, Nb and Cu) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] or oxides such as WO 3 [17] onto titanium dioxide has been widely used as a technique to extend the light absorption to the visible region.…”