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Title: Zn(II) ion biosorption onto surface of eucalyptus leaf biomass: Isotherm, Kinetic, and mechanistic modeling
Authors: Mishra V.
Balomajumder, Chandrajit
Agarwal, Vijaykumar
Published in: Clean - Soil, Air, Water
Abstract: Bioremediation of Zn(II) by biosorption across aqueous phase on to surface of eucalyptus leaf powder has been investigated in present research work. The adsorptive potential of eucalyptus leaf powder was evaluated as function of pH, temperature, contact time, agitation rate and particle size. Maximum metal ion uptake and percentage removal capacity of eucalyptus leaf powder were 23.5 mg g-1 and 94%, respectively, at optimized pH 5, 20 ± 1°C, contact time 6 h, particle size 0.5 mm and agitation rate 200 rpm. The biomass surface analysis revealed the fact that the biomass surface was heterogeneous and porous in nature. The functional groups like amine, amide, carboxyl, hydroxyl, and methyl groups, significantly important for metal ion binding were present on biomass surface in tremendous amount. Additionally, the Fourier transformation IR spectrum analysis of acid and base activated eucalyptus leaf biomass ruled out all the possibilities of the presence of surface functional groups mentioned above. The reaction rate was studied by applying two rate limiting models pseudo first and pseudo second order. Pseudo second order model was found to be more suitable (R2 = 0.998) in comparison to pseudo first order (R2 = 0.724). Adsorption equilibrium of batch stirred reaction data fitting shows the dominance of Langmuir isotherm (R2 = 0.99) against Freundlich isotherm (R2 = 0.887) model with equipartitional involvement of both film and intra particle diffusion as rate limiting steps at differential status of contact time.Eucalyptus leaf powder was used for biosorption experiments of Zn(II) ion containing aqueous samples. The results indicate a pseudo second order mechanism. In addition, the overall metal ion sorption dominates in the involvement of both film and intraparticle diffusion. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Citation: Clean - Soil, Air, Water(2010), 38(11): 1062-1073
Issue Date: 2010
Keywords: Bioremediation
Intra particle diffusion
Langmuir isotherm
Pseudo second order reaction
Zn(II) ion
ISSN: 18630650
Author Scopus IDs: 35322712800
Author Affiliations: Mishra, V., Department of Chemical Engineering, Indian Institute of Technology, Roorkee, India
Balomajumder, C., Department of Chemical Engineering, Indian Institute of Technology, Roorkee, India
Agarwal, V.K., Department of Chemical Engineering, Indian Institute of Technology, Roorkee, India
Corresponding Author: Mishra, V.; Department of Chemical Engineering, Indian Institute of Technology, Roorkee, India; email:
Appears in Collections:Journal Publications [CH]

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