Chemically oxidized pineapple fruit peel for the biosorption of heavy metals from aqueous solutions

Chemically oxidized pineapple fruit peel biomass has been used as a biosorbent for Cd(II) and Pb(II) removal from aqueous solutions. Fourier transform infrared spectroscopy and scanning electron microscopy techniques were used to characterize the treated pineapple fruit peel. The biosorption efficie...

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Bibliographic Details
Published in:Desalination and water treatment 2016-03, Vol.57 (14), p.6432-6442
Main Authors: Ahmad, Akil, Khatoon, Asma, Mohd-Setapar, Siti-Hamidah, Kumar, Rajeev, Rafatullah, Mohd
Format: Article
Language:English
Subjects:
Aqueous solutions
Biomass
Biosorption
Cadmium
Chemical modification
Fourier transforms
Fruits
Heavy metals
Hydroxyl groups
Infrared spectroscopy
Isotherm
Isotherms
Kinetics
Langmuir-Blodgett films
Lead
Mathematical models
Pineapples
Thermodynamics
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Summary:Chemically oxidized pineapple fruit peel biomass has been used as a biosorbent for Cd(II) and Pb(II) removal from aqueous solutions. Fourier transform infrared spectroscopy and scanning electron microscopy techniques were used to characterize the treated pineapple fruit peel. The biosorption efficiency of pineapple fruit peel for Cd(II) and Pb(II) was greatly enhanced after chemical oxidation probably due to introduction of carboxylic and hydroxyl groups onto the biosorbent surface. Biosorption kinetics for both metals was well described by pseudo-second-order kinetic equation and intraparticle film diffusion. Langmuir, Freundlich, and Temkin isotherm models were applied to the biosorption equilibrium data and best results were obtained with Langmuir isotherm model. Maximum monolayer biosorption capacity was found to be 42.10 and 28.55 mg g−1 for Cd(II) and Pb(II), respectively. Thermodynamic study indicates that the biosorption was exothermic and the spontaneity of the process decreases with the increase in solution temperature.
ISSN:1944-3986
1944-3994
1944-3986
DOI:10.1080/19443994.2015.1005150