Utilização de biossorventes produzidos a partir da casca de banana para a remoção de bisfenol-A presente em efluente sintético

Abstract

Among the contaminants highlighted due to potential risks to the environment and health, bisphenol-A (BPA) is one of the contaminants of great importance as it is present in our daily lives, as it is a plasticizer, and disrupts the endocrine system of beings alive. The detection of this in water sources is a consequence of the fact that national Effluent Treatment Plants are not designed to remove this type of pollutant, and this justifies the study of treatment technologies. In this sense, adsorption is a technique that has been applied for this purpose. Therefore, the objective of the present work is to evaluate the efficiency of the biosorbent made from banana peel (CB) in removing bisphenol-A (BPA) present in synthetic effluent. The CB and activated carbon (CA) adsorbents were characterized regarding moisture content, ash content, granulometric analysis, functional groups, zero charge point, pH, electrical conductivity, real specific mass, hydration capacity, elemental analysis by XRF, SEM and BET surface area. The adsorption tests were carried out by varying the amount of adsorbent, the influence of contact time and the influence of the initial adsorbate concentration. The data obtained were fitted to adsorption kinetic models (pseudo-first order and pseudo-second order) and adsorption isotherm models (Langmuir and Freundlich). The results of bisphenol-A removal at the optimum time for CB in the three adsorption tests were, respectively: 66.23 ± 2.06%, 77.98 ± 2.06% and 75.91 ± 0.86%. The characterization results of the adsorbents were similar, and most were compatible with what was found in the literature for other studies. The results used to evaluate the adsorption kinetics were satisfactorily adjusted to the two models tested, but the best fit was the pseudo-first order model. The kinetic models were adjusted using linear regression and non-linear regression to compare the error functions of these two modes. The results suggest that the non-linear regression had the lowest error function values compared to the linear one. The results used to evaluate the adsorption isotherms were satisfactorily adjusted to the two models tested, but the best fit was the Freundlich model. Finally, it is concluded that the adsorbent made from banana peel has great potential for use as an alternative adsorbent and that there are few studies relating this type of adsorbent to the removal of bisphenol-A. Therefore, it is necessary to continue this study seeking to improve it.