Adsorption of aluminum and lead from wastewater by chitosan-tannic acid modified biopolymers: Isotherms, kinetics, thermodynamics and process mechanism

[Display omitted] •Tannic acid-chitosan modified polymers efficiently adsorb Pb and Al ions.•Increasing the metal concentration increases the adsorption efficiency.•The adsorption process follows second-order-kinetic model.•The adsorption process follows the intraparticle diffusion model.•Adsorption...

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Bibliographic Details
Published in:International journal of biological macromolecules 2017-06, Vol.99, p.465-476
Main Authors: Badawi, M.A., Negm, N.A., Abou Kana, M.T.H., Hefni, H.H., Abdel Moneem, M.M.
Format: Article
Language:English
Subjects:
Adsorption
Adsorption isotherm
Aluminum - chemistry
Aluminum - isolation & purification
Chitosan
Chitosan - chemistry
Diffusion
Hydrogen-Ion Concentration
Kinetic models
Kinetics
Lead - chemistry
Lead - isolation & purification
Metal removal
Tannic acid
Tannins - chemistry
Thermodynamics
Waste Water - chemistry
Water Pollutants, Chemical - chemistry
Water Pollutants, Chemical - isolation & purification
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Summary:[Display omitted] •Tannic acid-chitosan modified polymers efficiently adsorb Pb and Al ions.•Increasing the metal concentration increases the adsorption efficiency.•The adsorption process follows second-order-kinetic model.•The adsorption process follows the intraparticle diffusion model.•Adsorption of the metal ions obeys Freundlich adsorption isotherm. Chitosan was reacted by tannic acid to obtain three modified chitosan biopolymer. Their chemical structures were characterized by FTIR and elemental analysis. The prepared biopolymers were used to adsorb Al(III) and Pb(II) metal ions from industrial wastewater. The factors affecting the adsorption process were biosorbent amount, initial concentration of metal ion and pH of the medium. The adsorption efficiency increased considerably with the increase of the biosorbent amount and pH of the medium. The adsorption process of biosorbent on different metal ions was fitted by Freundlich adsorption model. The adsorption kinetics was followed Pseudo-second-order kinetic model. The adsorption process occurred according to diffusion mechanism which was confirmed by the interparticle diffusion model. The modified biopolymers were efficient biosorbents for removal of Pb(II) and Al(III) metal ions from the medium.
ISSN:0141-8130
1879-0003
DOI:10.1016/j.ijbiomac.2017.03.003