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Issue 32, 2015
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Fabrication of hydroxyapatite/chitosan porous materials for Pb(II) removal from aqueous solution

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Abstract

Lead is one of the common heavy metal contaminants that pose a significant threat to human health. Herein, a freeze-drying method has been used to fabricate hydroxyapatite/chitosan (HAP/CS) porous materials for the removal of Pb(II) ions from aqueous solutions. The HAP/CS porous materials possessed interconnected three-dimensional macropores with pore sizes of 100–300 μm. Low-crystallinity HAP particles were dispersed uniformly among the porous materials. Adsorption experiments for Pb(II) ions were conducted under flow conditions. The adsorption capacity of the HAP/CS porous material was found to be 264.42 mg g−1, while that of the CS porous material was only 5.67 mg g−1. The better adsorption property of the HAP/CS porous material than the CS porous material was attributed to the presence of HAP particles in the composite material. During the adsorption process, the HAP particles were converted to rod-like lead hydroxyapatite (PbHAP, Pb10(PO4)6(OH)2) particles via a dissolution–precipitation reaction. Adsorption kinetic studies revealed that the adsorption of Pb(II) ions on the HAP/CS porous material exhibited a good fit to the pseudo-second-order kinetic model. Therefore, the HAP/CS porous materials possess a great potential for the removal of Pb(II) ions from aqueous solutions.

Graphical abstract: Fabrication of hydroxyapatite/chitosan porous materials for Pb(ii) removal from aqueous solution

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Publication details

The article was received on 27 Jan 2015, accepted on 04 Mar 2015 and first published on 04 Mar 2015


Article type: Paper
DOI: 10.1039/C5RA01628B
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Citation: RSC Adv., 2015,5, 25462-25470
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    Fabrication of hydroxyapatite/chitosan porous materials for Pb(II) removal from aqueous solution

    Y. Lei, J. Guan, W. Chen, Q. Ke, C. Zhang and Y. Guo, RSC Adv., 2015, 5, 25462
    DOI: 10.1039/C5RA01628B

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