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The use of Neem biomass for the biosorption of zinc from aqueous solutions

Arshad, Mamoona; Zafar, MNadeem LU ; Younis, Sadaf and Nadeem, Raziya (2008) In Journal of Hazardous Materials 157(2-3). p.534-540
Abstract
An adsorbent was developed from mature leaves and stem bark of the Neem (Azadirachta indica) tree for removing zinc from water. Adsorption was carried out in a batch process with several different concentrations of zinc by varying pH. The uptake of metal was very fast initially, but gradually slowed down indicating penetration into the interior of the adsorbent particles. The data showed that optimum pH for efficient biosorption of zinc by Neem leaves and stem bark was 4 and 5, respectively. The maximum adsorption capacity showed that the Neem biomass had a mass capacity for zinc (147.08 mg Zn/g for Neem leaves and 137.67 mg Zn/g Neem bark). The experimental results were analyzed in terms of Langmuir and Freundlich isotherms. The... (More)
An adsorbent was developed from mature leaves and stem bark of the Neem (Azadirachta indica) tree for removing zinc from water. Adsorption was carried out in a batch process with several different concentrations of zinc by varying pH. The uptake of metal was very fast initially, but gradually slowed down indicating penetration into the interior of the adsorbent particles. The data showed that optimum pH for efficient biosorption of zinc by Neem leaves and stem bark was 4 and 5, respectively. The maximum adsorption capacity showed that the Neem biomass had a mass capacity for zinc (147.08 mg Zn/g for Neem leaves and 137.67 mg Zn/g Neem bark). The experimental results were analyzed in terms of Langmuir and Freundlich isotherms. The adsorption followed pseudo-second-order kinetic model. The thermodynamic assessment of the metal ion-Neem tree biomass system indicated the feasibility and spontaneous nature of the process and Delta G degrees values were evaluated as ranging from -26.84 to -32.75 (Neem leaves) kJ/mol and -26.04 to -29.50 (Neem bark) kJ/mol for zinc biosorption. Due to its outstanding zinc uptake capacity, the Neem tree was proved to be an excellent biomaterial for accumulating zinc from aqueous solutions. (C) 2008 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
waste water, zinc, biosorption, Neem, kinetics, Gibbs free energy
in
Journal of Hazardous Materials
volume
157
issue
2-3
pages
534 - 540
publisher
Elsevier
external identifiers
  • wos:000258425900041
  • scopus:46449084616
ISSN
1873-3336
DOI
10.1016/j.jhazmat.2008.01.017
language
English
LU publication?
yes
id
063db245-162d-48c0-86a8-dfebe4d48af6 (old id 1252795)
date added to LUP
2008-11-17 15:08:06
date last changed
2017-07-30 03:32:47
@article{063db245-162d-48c0-86a8-dfebe4d48af6,
  abstract     = {An adsorbent was developed from mature leaves and stem bark of the Neem (Azadirachta indica) tree for removing zinc from water. Adsorption was carried out in a batch process with several different concentrations of zinc by varying pH. The uptake of metal was very fast initially, but gradually slowed down indicating penetration into the interior of the adsorbent particles. The data showed that optimum pH for efficient biosorption of zinc by Neem leaves and stem bark was 4 and 5, respectively. The maximum adsorption capacity showed that the Neem biomass had a mass capacity for zinc (147.08 mg Zn/g for Neem leaves and 137.67 mg Zn/g Neem bark). The experimental results were analyzed in terms of Langmuir and Freundlich isotherms. The adsorption followed pseudo-second-order kinetic model. The thermodynamic assessment of the metal ion-Neem tree biomass system indicated the feasibility and spontaneous nature of the process and Delta G degrees values were evaluated as ranging from -26.84 to -32.75 (Neem leaves) kJ/mol and -26.04 to -29.50 (Neem bark) kJ/mol for zinc biosorption. Due to its outstanding zinc uptake capacity, the Neem tree was proved to be an excellent biomaterial for accumulating zinc from aqueous solutions. (C) 2008 Elsevier B.V. All rights reserved.},
  author       = {Arshad, Mamoona and Zafar, MNadeem and Younis, Sadaf and Nadeem, Raziya},
  issn         = {1873-3336},
  keyword      = {waste water,zinc,biosorption,Neem,kinetics,Gibbs free energy},
  language     = {eng},
  number       = {2-3},
  pages        = {534--540},
  publisher    = {Elsevier},
  series       = {Journal of Hazardous Materials},
  title        = {The use of Neem biomass for the biosorption of zinc from aqueous solutions},
  url          = {http://dx.doi.org/10.1016/j.jhazmat.2008.01.017},
  volume       = {157},
  year         = {2008},
}