EMPREGO DE ZEÓLITA NA REMOÇÃO DOS CORANTES TÊXTEIS VIOLETA CRISTAL E AZUL DE METILENO EM SOLUÇÃO AQUOSA

Abstract

The adsorption technique has been widely used in the treatment of textile effluents, particularly in the adsorption of dyes from various chemical classes using alternative materials and low cost. In this study we investigated the adsorptive potential of a mineral clay (zeolite maranhense) is treated with hydrochloric acid in removal of cationic textile dyes crystal violet (CV) and methylene blue (MB) in an aqueous medium. For both effects were studied parameters such as pH, temperature and contact time, and studies of the kinetic, and thermodynamic parameters of isothermal adsorption. The characterization of the adsorbent occurred by IR, XRD, pHPCZ, surface area (BET), micropore volume and average pore diameter. The kinetic data were best represented by the Elovich kinetic model of the adsorption isotherms by Freundlich isotherm model. The maximum adsorption capacity of the treated zeolite was 34, 71 and 77, 11 mg gˉ¹ for the crystal violet and methylene blue, respectively. The thermodynamic parameters showed that the adsorption process is exothermic (negative ΔHads) and spontaneous with positive values ΔG and ΔS of adsorption negative. The treated zeolite shows good adsorptive capacity for the studied dye material as compared to other literature as well as lower cost.