Abstract
This work evaluated the catalytic activity of TiO2 synthesized by the
Pechini method. with varying molar ratios of 2:1, 3:1 and 4:1 of citric
acid/metallic cations, in the photocatalytic degradation of methyl red
dye in aqueous solution. The samples were characterized by X-ray
diffraction, phase quantification by Rietveld structure refinement, and
textural analysis by nitrogen adsorption, and their photocatalytic
performance was bench-tested. The results indicated that the 3:1 and 4:1
samples contained two phases, with 84.4 and 89% of anatase phase and
15.6 and 11% of rutile phase, respectively. The 2:1 sample contained
only anatase phase. The total discoloration of methyl red dye in 24
hours confirmed the high photocatalytic efficiency of the 2:1 sample,
which was ascribed to the formation of monophasic anatase.
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