Evaluation of Egyptian Banana Peel (Musa sp.) as a Green Sorbent for Groundwater Treatment

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Author(s) M.S. Mahmoud | Sahar M. Ahmed | Somaia G. Mohammad | Ahmed M. Abou Elmagd
Pages 648-659
Volume 4
Issue 11
Date November, 2014
Keywords groundwater treatment; manganese biosorption; banana peels; kinetic; thermodynamics

Abstract

Present study was conducted to investigate the removal of manganese from aqueous solution by using eco-friendly biosorbent of Banana peels activated carbon (BPAC). Batch experiments have been carried out to determine the influence of parameters such as pH, biosorbent dose, initial metal ion concentrations and contact times on the biosorption process. From these investigations, a significant increase in percentage removal of manganese 97.4 % is observed at pH value 5.0, biosorbent dose 0.8 g, initial concentration 20 ppm, temperature 25 ± 2 °C, stirring rate 200 rpm and contact time 2h. The equilibrium concentration and the adsorption capacity at equilibrium of the experimental results were fitted to the Langmuir, Freundlich and Dubinin-Radushkevich (D–R) isotherm models; the Langmuir isotherm was found to well represent the measured adsorption data implying BPAC had heterogeneous surface. The predicated maximum monolayer adsorption capacity of manganese for BPAC are found to be 11.806 mg/g. Pseudo- first-order, pseudo-second-order kinetic and intraparticle diffusion model were used to analyze the biosorption data; it was observed that the pseudo-second-order model best represented the relationship. The calculated thermodynamic parameters showed that the biosorption of manganese onto BPAC is spontaneous and endothermic in nature. A raw groundwater samples were collected from Baharmos groundwater treatment plant network at Embaba and Manshiet Elkanater City/District-Giza, Egypt, for treatment at the best conditions that reached at first phase by BPAC. The treatment with BPAC could reduce iron and manganese value of raw groundwater by 91.4% and 97.1 %, respectively and the effect of the treatment process on the microbiological properties of groundwater sample showed decrease of total bacterial count either at 22°C or at 37°C to 85.7 % and 82.4 %, respectively. Also, BPAC was characterized using SEM and FTIR spectroscopy.

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