Estimation of the Bicomponent Adsorption Behavior of Dyes: A Modeling Approach

Adsorption technologies for the treatment of effluents contaminated with colorants are at the forefront. The implementation of mathematical models in this phenomenon allows us to understand the phenomena that occur during the process. The objective of this research was to estimate the behavior of the dye mixtures Tartrazine Yellow (TY) and Brilliant Blue FCF (BB) in the adsorption process. The estimation method used an additive model of the Langmuir and Freundlich adsorption isotherms for each dye. The experimental data for the adjustment of the models were obtained from previous discontinuous regime experimentation, under the conditions: Co = 20–280 mg L−1; pH = 2; mads = 1.4 g; t = 180 min; Vsol = 100 ml; T = 298 K. The data were processed in the R Open software, with the use of the nls function to fit the corresponding equations. The models with the best fit to the experimental data correspond to the behaviors of the dyes such as Langmuir TY—Langmuir BB and Langmuir TY—Freundlich BB, respectively. The adjusted models presented RSE values lower than 0.60, which indicated a close approach to the experimental values. Furthermore, the analysis of the interactions showed an antagonistic behavior between the dyes.