Otimização do processo de biossorção de corante têxtil Reactive Blue 222

Abstract

In recent years there has been an increase in the interest and need to properly treat wastewater, mainly from industry. To minimize the environmental impact of improper waste disposal, various wastewater treatment techniques have been developed. Among these, biosorption is an economical and sustainable alternative as it is a simple, inexpensive and highly efficient technique and minimizes the use of chemicals. In view of this scenario, in this work, Uçá crab armor crustacean powder (Ucides cordatus) was used as the bioadsorbent to remove the reactive blue chemifix with 115% dye (Reactive Blue 222) and supplied by Matesa Textil-JP / PB. The finite bath operation was optimized for a mixed reactor system by scaling the adsorbent mass and solution volume 12-fold. The adsorbent was characterized by X-ray diffraction (XRD), infrared absorption spectroscopy (FT-IR), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX). N2 at 77 ° C and zero load point (PCZ). A study was conducted by a factorial design of 22 with 2 central points, taking into account as variables the temperature and the particle diameter, which finally gave a removal percentage of 76.44% for the conditions of 35 ° C and 35 ° C 42 mesh. The isothermal tests conducted at 25 ° C, 35 ° C and 45 ° C allowed the use of several models, with Sips best describing the behavior of the system at the three temperatures. Thermodynamic analysis suggested that this is a non-spontaneous and exothermic process. The kinetic assays showed that the equilibrium for the three temperatures occurs in a period of 420 minutes and is considered to be the second-order model best suited for the experimental data. The mixed reactor system performed satisfactorily and had important applicability to this type of study.