APLICAÇÃO DO MATERIAL MISTO ÓXIDO-HIDRÓXIDO DE FERRO(III) E ARGILA BENTONITA NA DEGRADAÇÃO DE CORANTES REATIVOS

Abstract

The dissertation evaluated the potential of photo-Fenton process opposite the degradation of reactive dyes, using the mixed material clay/Fe as catalyst. The analysis of mixed material characterization (MMT) indicate that Fe was immobilized on the surface of clay, because there was no increase in the interlayer space of the clay, and the concentration of Fe in the MMT was 14,8 ± 0,7 % m/m. The factorial planning indicated that process of degradation of the dye is mainly influenced by the concentration of peroxide, the pH of the medium and the amount of MMT has a lower influence on the process. The kinetic study of the degradation process indicated that there was a degradation of 74% of the dye in 100 minutes with the pH of the medium equal to 4, the peroxide concentration of 140 mg/L and 0,06 of MMT. Now at pH 7 there was a degradation of 86% of the dye, these results suggest that the pH of the medium has little influence on the process when the peroxide concentration is of 140 mg/L. The concentration of Fe in the MMT after the degradation process was of 13,6 ± 1,0% m/m, these results suggest that the amount of Fe leached into the reaction medium during the degradation process was very low, wherefore, the process of photo-Fenton must be mediated by Fe immobilized on the surface of the MMT, As regards of a heterogeneous catalysis