Biosorption of Zinc on to Gracilaria Corticata (Red Algae) Powder and Optimization using Central Composite Design

Volume
2, Issue 3
Pages:
412-425
Year of Publication:
December,2016
Journal of Applied Science and Engineering Methodologies
ISSN:
2395–5341
Citation: B.Anilkumar,N.Chitti Babu,G.Kavitha."Biosorption of Zinc on to Gracilaria Corticata (Red Algae) Powder and Optimization using Central Composite Design" Journal of Applied Science and Engineering Methodologies,Vol.2,Issue.3.(2016):412-425.
BibTex
@article{anilkumr2016biosorption, author = {B,Anilkumar.N,Chitti Babu.G,Kavitha}, title = {Biosorption of Zinc on to Gracilaria Corticata (Red Algae) Powder and Optimization using Central Composite Design}, journal = {Journal of Applied Science and Engineering Methodologies}, issue_date = {25}, volume = {2}, number = {3}, month = {Dec}, year = {2016}, issn = {2395–5341}, pages = {412-425}, numpages = {14}, url = {http://www.jasem.in/2016/23412425.html}, publisher = {Scientist Link Group of Publications}, address = {Chennai, India} } |
DOI: | Full Text Download |
Abstract:
This paper presents the biosorption of zinc from aqueous solutions using Gracilaria corticata (red algae) powder as a biosorbent. The equilibrium studies on biosorption of Zinc are carried out in batch process. The extent of removal depends on initial concentration of Zinc ion, pH, dosage, temperature etc. The optimum dosage is 15 g/L at the equilibrium agitation time of 60 min. The % biosorption is decreased from 94.16 % (1.559 mg/g) to 80.047 % (13.65 mg/g) with an increase in zinc initial concentration (C0) from 25 to 250 mg/L. The extent of biosorption is maximum at pH=6. The maximum monolayer coverage capacity of Gracilaria corticata for zinc ions is 18.51 mg/g . The theoretical optimum values are evaluated using Response Surface Methodology (RSM). The quadratic model for Central Composite Design (CCD) has fitted well to the experimental data. The experimental data are well described by Freundlich, Langmuir and Redlich-Peterson isotherm models. The biosorption data follows first order kinetics with a rate constant of 2.643 g/mg-min. The biosorption is endothermic, irreversible and spontaneous.
Keywords:Zinc, Biosorption, Response Surface Methodology (RSM), Isotherms, Kinetics, Thermodynamics
This paper presents the biosorption of zinc from aqueous solutions using Gracilaria corticata (red algae) powder as a biosorbent. The equilibrium studies on biosorption of Zinc are carried out in batch process. The extent of removal depends on initial concentration of Zinc ion, pH, dosage, temperature etc. The optimum dosage is 15 g/L at the equilibrium agitation time of 60 min. The % biosorption is decreased from 94.16 % (1.559 mg/g) to 80.047 % (13.65 mg/g) with an increase in zinc initial concentration (C0) from 25 to 250 mg/L. The extent of biosorption is maximum at pH=6. The maximum monolayer coverage capacity of Gracilaria corticata for zinc ions is 18.51 mg/g . The theoretical optimum values are evaluated using Response Surface Methodology (RSM). The quadratic model for Central Composite Design (CCD) has fitted well to the experimental data. The experimental data are well described by Freundlich, Langmuir and Redlich-Peterson isotherm models. The biosorption data follows first order kinetics with a rate constant of 2.643 g/mg-min. The biosorption is endothermic, irreversible and spontaneous.
Keywords:Zinc, Biosorption, Response Surface Methodology (RSM), Isotherms, Kinetics, Thermodynamics
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