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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/2026
Title: Dynamic, mechanistic, and thermodynamic modeling of Zn(II) ion biosorption onto zinc sequestering bacterium VMSDCM
Authors: Mishra V.
Balomajumder, Chandrajit
Agarwal, Vijaykumar
Published in: Clean - Soil, Air, Water
Abstract: The surface of the bacterial cells before the biosorption of Zn(II) ion has been found rough, heterogeneous, and non-crystalline together with tremendous protrusions and negatively charged functional groups. The bacterium was characterized as rod shaped with Gram-negative type of cell wall structure. In reaction dynamics, pseudo-second-order kinetics with higher linear correlation coefficient (R2) ranging between 0.97 and 0.99, lower sum of square errors (SSE) (0.035-0.081) and chi (?2) (0.0013-0.009) provided a better explanation of sorption of Zn(II) ion on bacterium surface as compared to pseudo-first-order model. The removal of Zn(II) was governed by both film and intra-particle diffusion at onset and later stage of sorption of metal ion on the surface of bacterial cells. The R2 (0.92-0.94) for intra-particle diffusion model was quite higher with lower values of SSE (9.56-16.33) and chi (?2) (11.26-19.65) against the Bangham's model. The positive value of ?H (16.628×10-6kJ/mol) and ?S (5320.90kJ/mol/K) showed that the biosorption of Zn(II) ion across liquid phase on bacterial surface was endothermic with increased randomness at solid-liquid interface. The negative values of ?G demarcated the whole process as spontaneous in nature. In the present work, the distribution coefficient was found to be >0.5 at various temperature ranges. At the attainment of equilibrium, the residual concentration of Zn(II) ion in liquid phase was around 0.6mg/L, which was much below the limit described by United States Environmental Protection Agency (USEPA), i.e. 5mg/L. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Citation: Clean - Soil, Air, Water(2013), 41(9): 883-889
URI: https://doi.org/10.1002/clen.201200532
http://repository.iitr.ac.in/handle/123456789/2026
Issue Date: 2013
Keywords: Biomass
Heavy metal
Intra-particle diffusion
Kinetics
Wastewater treatment
ISSN: 18630650
Author Scopus IDs: 35322712800
35615087500
25637008500
Author Affiliations: Mishra, V., Department of Chemical Engineering, Indian Institute of Technology, Roorkee, India, Department of Chemical Engineering, University of Petroleum and Energy Studies, Energy Acres, Dehradun, 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, Roorkee 247667, India; email: vishal.biochemical@gmail.com
Appears in Collections:Journal Publications [CH]

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