Abstract
Titanium dioxide has been widely investigated in the removal of organic
pollutants. It is a polymorphic material which, depending on the
conditions and the type of synthetic method used in its preparation may
be monophasic or biphasic, with predominance of one of the phases.
Therefore, this paper proposes the evaluation of the structure,
morphology and photocatalytic activity in the degradation of methyl red
dye by TiO2 samples synthesized by the Pechini method with citric
acid/metal cation ratios of 4:1 and 6:1. The synthesized samples were
calcined at 500 degrees C for 1 hour and were characterized by X-ray
powder diffraction technique by using Rietveld refinement, textural
analysis, scanning electron microscopy and photocatalytic test sin bench
scale, using methyl red dye. The results showed that the sample 4:1 led
to the formation of two phases, 89% anatase and 11% rutile, while the
sample 6:1 led only to the formation of the anatase phase. The 4:1
sample, a mixture of anatase and rutile phase, photocatalytically, was
more effective than the 6:1 sample.
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