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Kinetic and adsorption behaviour of aqueous Fe2+, Cu2+ and Zn2+ using a 30 nm hydroxyapatite based powder synthesized via a combined ultrasound and microwave based technique
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Kinetic and adsorption behaviour of aqueous Fe2+, Cu2+ and Zn2+ using a 30 nm hydroxyapatite based powder synthesized via a combined ultrasound and microwave based technique

S. Brundavanam, G.E.J. Poinern and D. Fawcett
American Journal of Materials Science, Vol.5(2), pp.31-40
2015
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Abstract

The present study reports the kinetic and absorption performance of novel nanometre scale hydroxyapatite (HAP) absorber synthesised from a combined ultrasound and microwave based technique for the removal of metal ions (Fe2+, Cu2+ and Zn2+) from aqueous solutions. After powder characterisation was carried out using XRD, SEM, EDS and FT-IR, batch adsorption studies were carried out. Kinetic studies established that Fe2+and Cu2+ ion adsorption tended to follow a pseudo-second order model, while Zn2+ ion adsorption tended to follow an intra-particle diffusion pattern. All three metal ion adsorption studies indicated an ion-exchange mechanism (metal ion → Ca2+) was a primary participant in the sorption process and was influenced by intra-particle diffusion. The Isotherm studies indicated the Langmuir isotherm modelled Fe2+ and Cu2+ ion adsorption, while the Freundlich isotherm was the better model for Zn2+ ion adsorption data. Maximum adsorption capacity of HAP determined via Langmuir isotherm was found to be 61.35 mg/g for Cu2+ ions, 55.25 mg/g for Fe2+ ions and 48.54 mg/g for Zn2+ ions. The study established HAP as an effective absorbent material for the removal of Fe2+, Cu2+ and Zn2+ loaded aqueous solutions.

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