Journal of the Brazilian Chemical Society
On-line version ISSN 1678-4790
CRISTANTE, Valtair M. et al. Enhanced photocatalytic reduction of Hg(II) in aqueous medium by 2-aminothiazole-modified TiO2 particles. J. Braz. Chem. Soc. [online]. 2006, vol.17, n.3, pp.453-457. ISSN 1678-4790. http://dx.doi.org/10.1590/S0103-50532006000300004.
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.
Keywords : TiO2; 2-aminothiazole; photocatalysis; 3-chloropropyltrimethoxysilane.