Resumo

GONZALEZ-JUAREZ, Julio César; JIMENEZ-BECERRIL, Jaime  e  CEJUDO-ALVAREZ, Jesús. Degradation of 4-Chlorophenol by Gamma Radiation of ¹³⁷Cs and X-rays. J. Mex. Chem. Soc [online]. 2010, vol.54, n.3, pp.157-159. ISSN 1870-249X.

This paper presents results of radiolytic degradation of 4-chlorophenol in the presence of TiO₂, Al₂O₃, y SiO₂, using different radiation sources than ⁶⁰Co, which is so common in this type of experiment. The radiation sources used were X-rays with energy of 100 keV and radiation from ¹³⁷Cs (662 keV). After irradiation with a dose of 50 cGy X-ray and TiO₂ obtained a degradation of about 5%, no degradation was obtained with ¹³⁷Cs source and other oxides. This may be due to the fact that X-rays have a linear energy transfer (LET) greater value, and in the case of TiO₂ present a crystalline structure, whereas the other two oxides are amorphous. Both characteristics result in better formation of a reactive species that allows the degradation of the compound.

Palavras-chave : Radiocatalysis; Photocatalysis; Radiation Induced Catalysis; 4-Chlorophenol.

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