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Abstract del producto

Abstract: This study focused on searching for more effective nanomaterials for environmental
remediation and health protection; thus, coliform bacteria, yeast and the organic food dye sunset
yellow were selected as target pollutants to be eliminated under solar light by Ag/Cr-TiO2 and
Pd/Cr-TiO2
. Firstly, Cr3+ was in situ incorporated into the anatase crystalline lattice by the sol-gel
method; then, Ag or Pd nanoparticles were deposited on Cr-TiO2 by chemical photoreduction. The
scientific challenge addressed by the development of these composites was to analyse the recovery
of Cr, to be employed in photocatalyst formulation and the enhancement of the TiO2 photocatalytic
activity by addition of other noble metals. By extensive characterization, it was found that after
TiO2 doping with chromium, the parameters of the crystal lattice slightly increased, due to the
incorporation of Cr ions into the lattice. The TiO2 band gap decreased after Cr addition, but an
increase in the optical absorptions towards the visible region after noble metals deposition was also
observed, which was dependent of the Ag or Pd loading. Generally, it was observed that the noble
metals type is a factor that strongly influenced the effectiveness of the photocatalysts concerning
each substrate studied. Thus, by using Ag(0.1%)/Cr-TiO2
, the complete elimination of E. coli from
samples of water coming from a highly polluted river was achieved. Pd(0.5%)/Cr-TiO2 showed the
highest efficiency in the elimination of S. cerevisiae from a lab prepared strain. On the other hand, the
Pd(0.1%)/Cr-TiO2 sample shows the highest dye degradation rate, achieving 92% of TOC removal
after 180 min.

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