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Adsorptive Removal of Chromium Ions from Synthetic Effluents by Mentha Arvensis Biomass: Kinetic and Equilibrium Modeling

Author(s): Haq Nawaz Bhatti | Rabia Hafiz | Muhammad Asif Hanif

Journal: International Journal of Chemical and Environmental Engineering
ISSN 2078-0737

Volume: 2;
Issue: 4;
Start page: 261;
Date: 2011;
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Keywords: Chromium | adsorption | kinetics | thermodynamics | recovery

In this study the binding capacity of Mentha arvensis biomass for the chromium ions from aqueous synthetic effluents was investigated as a function of pH, biosorbent dose, biosorbent size, temperature, contact time and initial metal concentration in a batch mode. Effect of pretreatments with NaOH, HCl, acetic acid, Trition X-100 and acetone was also studied. The adsorption capacity of biomass was found to be significantly increased by pretreatments. Trition X-100 pretreated biomass showed remarkable increase in sorption capacity. Maximum adsorption of Cr(III) and Cr(VI) was observed at pH 4 and 2 respectively. The adsorption of Cr(III) and Cr(VI) onto Mentha arvensis waste biomass decreased with increase in temperature and biosorbent dose while the adsorption of Cr(III) and Cr(VI) increased with increase in contact time. Equilibrium data was better described by Langmuir isotherm model as compared to Freundlich isotherm. The overall adsorption process was best described by pseudo-second-order kinetics. Desorption study was also carried out to recover the chromium ions from the biomass using different concentration of HCl.. The results indicated that Mentha arvensis biomass could be used for removal of toxic metal ions from industrial effluents.
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