Surface properties of Moroccan natural phosphate and its converted hydroxyapatite for adsorption of Cr3+/Cr2O72– ions: Kinetics and isotherms

Surface of the natural phosphate and its converted hydroxyapatite was evaluated to develop an effective adsorbent suitable for the removal of individual oxymetal of Cr6+ and Cr3+ ions using batch system at room temperature. The converted hydroxyapatite was prepared from natural phosphate and charact...

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Bibliographic Details
Published in:Desalination and water treatment 2017-12, Vol.100, p.145-150
Main Authors: Fanidi, Kenza, Bouiahya, Khadija, Gouza, Asmae, Saoiabi, Ahmed, Laghzizil, Abdelaziz
Format: Article
Language:English
Subjects:
Adsorption
Chromium
Converted hydroxyapatite
Phosphate rock
Surface property
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Summary:Surface of the natural phosphate and its converted hydroxyapatite was evaluated to develop an effective adsorbent suitable for the removal of individual oxymetal of Cr6+ and Cr3+ ions using batch system at room temperature. The converted hydroxyapatite was prepared from natural phosphate and characterized using various techniques. The experimental results suggest that several active sites exist on natural and synthetic apatite surfaces. They showed a high affinity of natural phosphate for the Cr2O72– ions than c-HAP contrary to that of Cr3+ ions related to the presence of silica in natural adsorbent while the converted apatite has a good affinity for Cr3+ ions. The difference in adsorptive capacities is also related to the oxidation state of chromium and surface charge, which are effective parameters for Cr uptake on the natural and synthetic apatite.
ISSN:1944-3986
DOI:10.5004/dwt.2017.21803