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Removal of As (III) from Aqueous Solution by Biosorption onto Maize (Zea mays) Leaves Surface: Parameters Optimization Sorption Isotherm, Kinetic and Thermodynamics Studies

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Author Affiliations

  • 1Department of Chemical Engineering, Indian Institute of Technology Roorkee, Uttarakhand, INDIA

Res.J.chem.sci., Volume 1, Issue (5), Pages 73-79, August,18 (2011)

Abstract

Biosorption has been used for the removal of As (III) ion from aqueous solution using powdered maize leaves biomass in this study. Batch experiments were conducted by varying various process parameters such as pH, contact time and temperature. At optimum treatment conditions (pH 8, contact time of 4 hrs and temperature of 40oC) 84.9% As (III) ion was removed from aqueous solution. Langmuir and Freundlich isotherms were used for equilibrium studies. Freundlich isotherm was better fitted with experimental data. For kinetic studies, pseudo second order kinetic model (R =0.997) appeared to be more suitable model to describe As (III) ion biosorption. The positive value of S° and H° depicts the feasibility of the biosorption and the spontaneous nature was confirmed by negative value of . Fourier Transformation infrared spectrometry (FTIR) and Scanning Electron Microscopy (SEM) were used for characterisations of maize leaves biomass.

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