Cinética de biossorção de corante orgânico em resíduos de crustáceos encontrados no Estado de Sergipe

Abstract

The process of degradation of water resources has been accentuated due to the growing number of industrial activities, which release their effluents containing contaminants such as heavy metals and organic dyes; without proper treatment, in water bodies. The adsorption technique is widely used in the treatment of these liquid effluents, however, traditional adsorbents such as activated carbon have a high cost. In this context of the use of biosorption using cheap and alternative biosorbents, this research work aimed to study sorption kinetics of methylene blue in crustacean biomass found in Sergipe state, such as crab (Ucides cordatus), crab (Callinectes exasperatus) , guiamum (Cardisoma guanhumi) and oyster (Crassostrea brasiliana). The crustacean residues collected in the bars of the Aracaju-SE waterfront were washed and ground, then characterized by the zero loading point (PZC), and the influence of pH on the removal efficiency of methylene blue by the biomasses of the plants was also evaluated. crustaceans. Then, kinetic data were obtained through batch experiments and modeling was performed. The biomasses showed slightly basic to basic PCZ: crab (7.75), crab (9.25), guaiamum (9.75) and oyster (8.25). Thus, they had higher removal efficiency at oval efficiency, 82%, followed by oyster with 78%, crab, 77% and crab with 63%. However, the biomass presented moderate removal efficiency in the pH range from 3 to 7. The kinetics were fast, reaching equilibrium between 10 and 20 minutes and the kinetic data adjusted well to the pseudo-second order model, being the crab biomass. best adapted to this model. The crustacean biomass presented as promising biosorbents and can be used in conjunction with traditional adsorbents, without the need to adjust the effluent pH, and with rapid sorption kinetics of methylene blue.