Eu 3+ Sequestration by Biogenic Nano-Hydroxyapatite Synthesized at Neutral and Alkaline pH

Rajkumar Gangappa, Adam Farrier, Lynne E. Macaskie

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Biogenic hydroxyapatite (bio-HA) has the potential for radionuclide capture and remediation of metal-contaminated environments. Biosynthesis of bio-HA was achieved via the phosphatase activity of a Serratia sp. supplemented with various concentrations of CaCl2 and glycerol 2-phosphate (G2P) provided at pH 7.0 or 8.6. Presence of hydroxyapatite (HA) was confirmed in the samples by X-ray powder diffraction analysis. When provided with limiting (1 mM) G2P and excess (5 mM) Ca2+ at pH 8.6, monohydrocalcite was found. This, and bio-HA with less (1 mM) Ca2+ accumulated Eu(III) to ∼31% and 20% of the biomineral mass, respectively, as compared to 50% of the mineral mass accumulated by commercial HA. Optimally, with bio-HA made at initial pH 7.0 from 2 mM Ca2+ and 5 mM G2P, Eu(III) accumulated to ∼74% of the weight of bio-HA, which was equal to the mass of the HA mineral component of the biomaterial. The implications with respect to potential bio-HA-barrier development in situ or as a remediation strategy are discussed.
Original languageEnglish
Pages (from-to)753-759
Number of pages7
JournalGeomicrobiology Journal
Issue number9
Early online date19 Jan 2017
Publication statusPublished - 2017


  • Biomineralization
  • bioremediation
  • europium
  • hydroxyapatite,
  • monohydrocalcite
  • Serratia


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