Enhanced photocatalytic reduction of Hg(II) in aqueous medium by 2-aminothiazole-modified TiO2 particles

This work describes the synthesis and characterization of 2-aminothiazole-modified titania and its application on Hg (II) photoreduction in aqueous medium. Infrared spectroscopy confirmed the chemical modification of the titania matrix. The number of 2-aminothiazole groups attached to the titania wa...

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Bibliographic Details
Published in:Journal of the Brazilian Chemical Society 2006-06, Vol.17 (3), p.453-457
Main Authors: Cristante, Valtair M., Araujo, Adriana B., Jorge, Sônia M. A., Florentino, Ariovaldo O., Valente, José P. S., Padilha, Pedro M.
Format: Article
Language:English
Subjects:
2-aminothiazole
3-chloropropyltrimethoxysilane
CHEMISTRY, MULTIDISCIPLINARY
photocatalysis
TiO2
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Summary:This work describes the synthesis and characterization of 2-aminothiazole-modified titania and its application on Hg (II) photoreduction in aqueous medium. Infrared spectroscopy confirmed the chemical modification of the titania matrix. The number of 2-aminothiazole groups attached to the titania was determined by Kjeldahl's method. The photocatalytic experiments were carried out in a cylindrical photoreactor thermostatted at 298 K. The resulting modified photocatalyst 2-aminothiazole titania (TiAT) revealed an enhance in the Hg (II) photoreduction capacity at studied pH values (3, 7 and 9). In addition, sorption studies showed that the photocatalyst TiAT presented a lower equilibrium time and a higher sorption capacity of Hg(II) ion, demonstrating that sorption plays a fundamental role in the photoreduction mechanism.
ISSN:0103-5053
1678-4790
1678-4790
DOI:10.1590/S0103-50532006000300004