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Latin American applied research
versão impressa ISSN 0327-0793versão On-line ISSN 1851-8796
Resumo
COLLAZZO, G. C.; JAHN, S. L. e 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 0327-0793.
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.
Palavras-chave : TiO2; Photocatalysis; Adsorption; Degradation; Dye.