Utilization of Mangifera indica leaves powder as a cost-effective adsorbent for the removal of eosin yellow from wastewater

The current research was designed to use the Mangifera indica (mango) leaves (MIL) powder for eradication of eosin yellow (EY) dye from an aqueous solution at 25 degrees C. Adsorption of eosin yellow (EY) onto MIL powder was investigated by X-ray diffraction. The percentage adsorption of EY was increased with contact time, mass of MIL powder (adsorbent) and temperature while decreased with EY initial concentration. Several non-linear isotherm models were applied in order to investigate EY adsorption onto MIL powder and attained results exhibited that adsorption of EY obeyed non-linear Langmuir isotherm model. Determined maximum theoretical adsorption capacity was 39.67 mg/g. In addition, EY adsorption onto MIL powder was physical adsorption process. Adsorption kinetics of EY adsorption was illustrated by applying non-linear pseudo-first-order and pseudo-second-order models. Attained results exhibited that non-linear pseudo-second-order model fitted to EY adsorption. Thermodynamics investigations represented the endothermic and spontaneous nature of EY adsorption process. The desorption of EY from MIL powder was also studied.