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

作者：Handley Sidhu Stephanie; Renshaw Joanna C; Yong Ping; Kerley Robert; Macaskie Lynne E^*

来源：Biotechnology Letters, 2011, 33(1): 79-87.

DOI：10.1007/s10529-010-0391-9

• Biomineralisation
• Hydroxyapatite
• Nanoparticles
• Strontium removal
• Bioremediation

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 similar to 25 nm from XRD data using the Scherrer equation, whereas Comm-HA powder size was measured as <= 50 mu m. The nano-crystalline Bio-HA was similar to 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.

• 出版日期2011-1