Biossorção do corante têxtil Preto Reafix Super 2R com bagaço de malte

Abstract

In the textile industry large volumes of waste are generated, which are characterized by being colored and pollutants due to the presence of dyes in its composition. With the need of decontamination, different methods are used in the treatment, one of them, the biosorption. This method consists in the removal of toxic substances using biosorbents obtained from agricultural waste and by-products of industrial processes. The main objective of this study was the removal of dye Black Reafix Super 2R in aqueous solutions by biosorption with malt bagasse. Relying primarily on the kinetic study and balance between biosorbent and dye. In the first phase it was studied the influence of the operating parameters as the influence of the average diameter of the biosorbent particles, the pH of the solution and the solution stirring speed. Being the optimal conditions of biosorption set at pH 2, stirring speed of 150 rpm and biomass without screening. Subsequently, set the kinetic models of Pseudo-first order, Pseudo-second order and intraparticle Diffusion to the experimental results obtained by the adsorption kinetics also evaluating the influence of temperature on contact time to achieve the balance. The Pseudo-second order model resulted in the best fit, with a correlation coefficient (R2) of approximately 1. From the balance tests performed with different pigment concentrations were fitted Langmuir, Freundlich and Temkin isotherms to the experimental results yielding very significant parameters for the Langmuir model whose maximum removal capacity (qmax) obtained was 40,16 mg.g-1. The analysis of the thermodynamic parameters allowed to evaluate that the adsorption process occurs spontaneously, being endothermic and throughout the process increases the randomness at the solid/solution interface due to the process disorganization because of the interactions that occur.