Nano-crystalline hydroxyapatite bio-mineral for the treatment of strontium from aqueous solutions |
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| Authors: | Stephanie Handley-Sidhu Joanna C Renshaw Ping Yong Robert Kerley Lynne E Macaskie |
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| Institution: | (1) School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK;(2) School of Biosciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK; |
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| Abstract: | Hydroxyapatites were analysed using electron microscopy, X-ray diffraction (XRD) and X-ray fluorescence (XRF) analysis. Examination
of a bacterially produced hydroxyapatite (Bio-HA) by scanning electron microscopy showed agglomerated nano-sized particles;
XRD analysis confirmed that the Bio-HA was hydroxyapatite, with an organic matter content of 7.6%; XRF analysis gave a Ca/P
ratio of 1.55, also indicative of HA. The size of the Bio-HA crystals was calculated as ~25 nm from XRD data using the Scherrer
equation, whereas Comm-HA powder size was measured as ≤50 μm. The nano-crystalline Bio-HA was ~7 times more efficient in removing
Sr2+ from synthetic groundwater than Comm-HA. Dissolution of HA as indicated by the release of phosphate into the solution phase
was higher in the Comm-HA than the Bio-HA, indicating a more stable biomaterial which has a potential for the remediation
of contaminated sites. |
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