Etude expérimentale de l’affinité de la rhodamine B et du chrome héxavalent en vers la biosorption sur l'épluchures de banane

Abstract

The adsorption of two basic pollutants, organique RB and inorganique CrVI on banana peels powder were investigated using a batch adsorption technique. A series of experiments were undertaken in an agitated batch adsorber to assess the effect of the system variables such as solution pH, initial concentration ,the effect of adsorbent dosage and contact time were investigated. The results showed that the increase in the banana peels dosage from 0.1 to 2 g/L significantly increased the chromic compounds adsorption rates from 95.2 to 95.82%.and for RB from 88.97 to 92.33% Removal of pollutants (RB and CrVI) were observed to be most effective at lower pH. Freundlich, Langmuir and Temkin isotherm models were applied to the equilibrium data. The results showed that Langmuir equation fits better than the Freundlich and Temkin equations. It was observed that the banana peels adsorbent showed higher adsorption capacity for RB (4.61mg/g) than CrVI (2.39 mg/g). The adsorption of pollutants on to banana peels proceeds according to a pseudo-second-order model. The studies show that banana peels powder inexpensive material, can be an alternative to other expensive adsorbents used for dyes and metals removal in wastewater treatment.