Remoção do corante azul de metileno por fotocatálise heterogênea com radiação UV artificial e dióxido de titânio (TiO₂) como catalisador

Abstract

Most of the dyes cause changes to the environment, and one of these dyes is methylene blue, widely used in textile industries in the production of paper and other materials as polyesters and nylons. The heterogeneous photocatalysis using tiânio dioxide (TiO2) is increasingly used for effluent treatment in the chemical industry and one of these treatments is for remove color. Therefore, the focus of this study was to examine concentration removal of the methylene blue dye by heterogeneous photocatalysis using two different sources of artificial ultraviolet light and titanium dioxide as catalyst in different concentrations. Two reactors were used in the experiments, the first one with a black light lamp, and the second with mercury-vapor lamp. In these reactors were tested different concentrations of TiO2 put suspensed in the methylene blue solution. For data analysis, two mathematical models were used to determine the reactions rates of each experiment, the Ordinary Differential Equation first nonhomogeneous order and pseudo first order, being used the first one in stabilized reactions and the second for not stabilized reactions. Thus, it was found that the catalyst concentration influences the reaction rate. The mercury vapor lamp obtained the higher efficiency compared to the black light lamp, and in the two reactors was noted a greater efficiency for 1.0 gL-1 TiO2 concentration.