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Instruments / Technical Area	Publication Details	Published	Actions
I18-Microfocus Spectroscopy	Bacterially Produced Calcium Phosphate Nano-Biominerals: Sorption Capacity, Site Preferences and Stability of Captured Radionuclides Stephanie Handley-sidhu , Joe Hriljac , Mark Olaf Cuthbert , Joanna Renshaw , Richard Pattrick , John Charnock , Bjorn Stolpe , Jamie Lead , Stephen Baker , Lynne E. Macaskie Environmental Science & Technology 48 (12) DOI: 10.1021/es500734n Diamond Proposal Number(s): [6647] Open Access Show Abstract ▼ Abstract: A Serratia sp. bacterium manufactures amorphous calcium phosphate nanominerals (BHAP); this material has shown increased sorption capacity for divalent radionuclide capture. When heat-treated (≥450 °C) the cell biomass is removed and the biominerals are transformed to hydroxyapatite (HAP). Using a multimethod approach, we have elucidated both the site preferences and stability of analogue radionuclide incorporation for Sr, Co, Eu, and U. Strontium incorporates within the bulk amorphous inorganic phase of BHAP; however, once temperature modified to crystalline HAP, bonding was consistent with Sr substitution at the Ca(1) and/or Ca(2) sites. Cobalt incorporation occurs within the bulk inorganic amorphous phase of BHAP and within the amorphous grain boundaries of HAP. Europium (an analogue for trivalent actinides) substituted at the Ca(2) and/or the Ca(3) position of tricalcium phosphate, a known component of HAP grain boundaries. Uranium was surface complexed with no secondary minerals detected. With multiple sites for targeted radionuclide incorporation, high loadings, and good stability against remobilization, BHAP is shown to be a potential material for the remediation of aqueous radionuclide in groundwater.	May 2014

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I18-Microfocus Spectroscopy

Bacterially Produced Calcium Phosphate Nano-Biominerals: Sorption Capacity, Site Preferences and Stability of Captured Radionuclides

Stephanie Handley-sidhu , Joe Hriljac , Mark Olaf Cuthbert , Joanna Renshaw , Richard Pattrick , John Charnock , Bjorn Stolpe , Jamie Lead , Stephen Baker , Lynne E. Macaskie

Environmental Science & Technology 48 (12)

DOI: 10.1021/es500734n

Diamond Proposal Number(s): [6647]