Abstract

COLLAZZO, G. C.; JAHN, S. L.  and  FOLETTO, E. L.. Removal of Direct Black 38 dye by adsorption and photocatalytic degradation on TiO₂ prepared at low temperature. Lat. Am. appl. res. [online]. 2012, vol.42, n.1, pp. 55-60. ISSN 1851-8796.

TiO₂ powder was prepared by a hydrothermal process at 200°C for 12 h. The material was characterized by X-ray diffraction and N₂ adsorption-desorption isotherm. The synthesized sample presented a pure phase anatase, with nanometric particle size. Its activity was tested for adsorption and degradation of the azo leather dye, Direct Black 38. The adsorption isotherm obtained followed the S-type in terms of the classification of Giles. Thermodynamic parameters were calculated, and the results revealed that the adsorption process is endothermic in nature. The material showed highly photocatalytic activity in the degradation of the dye, similar to that of the TiO₂ (P25 Degussa) photocatalyst.

Keywords : TiO₂; Photocatalysis; Adsorption; Degradation; Dye.