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Interaction between low molecular weight organic acids and hydroxyapatite with different degrees of crystallinity
Citation
Wei, W and Zhang, X and Cui, J and Wei, Z, Interaction between low molecular weight organic acids and hydroxyapatite with different degrees of crystallinity, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 392, (1) pp. 67-75. ISSN 0927-7757 (2011) [Refereed Article]
Copyright Statement
Copyright 2011 Elsevier B.V.
DOI: doi:10.1016/j.colsurfa.2011.09.034
Abstract
In this study, two types of hydroxyapatite (HAP) with different degrees of crystallinity were prepared by
a sol–gel method and a chemical precipitation method. Influences of crystallinity on the adsorption and
dissolution properties of HAP, and the release of phosphorus (total phosphorus) during the adsorption
of organic acid were investigated. Results showed that crystallinity had a great effect on the adsorption
capacity and dissolution properties of HAP, as well as the adsorption mechanisms of organic acids on HAP
surfaces. The poorly crystallized (the degree of crystallinity Xc = 0.23) HAP adsorbed greater amounts of
oxalic, citric, or malic acid than the well crystallized (Xc = 0.86) HAP, and the former could release more
phosphorus in the presence of organic acids. The adsorption capacity of oxalic acid was much higher
than citric and malic acids on both the well and the poorly crystallized HAP, which was due to the strong
coordination of oxalic acid with calcium on HAP surface, and that physical adsorption was more inclined
to dominate the adsorption of malic or citric acid on the well crystallized HAP. These findings might be
of importance in understanding the effects of crystallinity and organic acid binding on the dissolution of
calcium phosphates and the adsorption characteristics of HAP.
Item Details
Item Type: | Refereed Article |
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Keywords: | adsorption, dissolution, crystallinity, interaction mechanism |
Research Division: | Chemical Sciences |
Research Group: | Analytical chemistry |
Research Field: | Separation science |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the chemical sciences |
UTAS Author: | Wei, Z (Professor Zhenggui Wei) |
ID Code: | 91135 |
Year Published: | 2011 |
Web of Science® Times Cited: | 51 |
Deposited By: | Austn Centre for Research in Separation Science |
Deposited On: | 2014-05-09 |
Last Modified: | 2014-06-12 |
Downloads: | 0 |
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