Nano-crystalline hydroxyapatite bio-mineral for the treatment of strontium from aqueous solutions

Stephanie Handley-Sidhu, Joanna C. Renshaw, Ping Yong, Robert Kerley, Lynne E. Macaskie

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


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 Sr 2+ 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. 

Original languageEnglish
Pages (from-to)79-87
Number of pages9
JournalBiotechnology Letters
Issue number1
Publication statusPublished - 1 Jan 2011


  • biomineralisation
  • bioremediation
  • hydroxyapatite
  • nanoparticles
  • strontium removal
  • aqueous solutions
  • biomineral
  • nano-crystalline hydroxyapatite


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