title: Uptake of Sr2+ and Co2+ into biogenic hydroxyapatite: implications for biomineral ion exchange synthesis.
abstract: Biomineral hydroxyapatite (Bio-HAp) produced by Serratia sp. has the potential to be a suitable material for the remediation of metal contaminated waters and as a radionuclide waste storage material. Varying the Bio-HAp manufacturing method was found to influence hydroxyapatite (HAp) properties and consequently the uptake of Sr(2+) and Co(2+). All the Bio-HAp tested in this study were more efficient than the commercially available hydroxyapatite (Com-HAp) for Sr(2+) and Co(2+) uptake. For Bio-HAp the uptake for Sr(2+) and Co(2+) ranged from 24 to 39 and 29 to 78 mmol per 100 g, respectively. Whereas, the uptake of Sr(2+) and Co(2+) by Com-HAp ranged from 3 to 11 and 4 to 18 mmol per 100 g, respectively. Properties that increased metal uptake were smaller crystallite size (<40 nm) and higher surface area (>70 m(2) g(-1)). Organic content which influences the structure (e.g., crystallite arrangement, size and surface area) and composition of Bio-HAp was also found to be important in Sr(2+) and Co(2+) uptake. Overall, Bio-HAp shows promise for the remediation of aqueous metal waste especially since Bio-HAp can be synthesized for optimal metal uptake properties.
authors.affiliation: School of Geography Earth and Environmental Sciences, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK. s.handley-sidhu@bham.ac.uk
authors.forename: S
authors.initials: S
authors.lastname: Handley-Sidhu
authors.forename: J C
authors.initials: JC
authors.lastname: Renshaw
authors.forename: S
authors.initials: S
authors.lastname: Moriyama
authors.forename: B
authors.initials: B
authors.lastname: Stolpe
authors.forename: C
authors.initials: C
authors.lastname: Mennan
authors.forename: S
authors.initials: S
authors.lastname: Bagheriasl
authors.forename: P
authors.initials: P
authors.lastname: Yong
authors.forename: A
authors.initials: A
authors.lastname: Stamboulis
authors.forename: M
authors.initials: M
authors.lastname: Paterson-Beedle
authors.forename: K
authors.initials: K
authors.lastname: Sasaki
authors.forename: R A D
authors.initials: RA
authors.lastname: Pattrick
authors.forename: J R
authors.initials: JR
authors.lastname: Lead
authors.forename: L E
authors.initials: LE
authors.lastname: Macaskie
mesh_terms: D001673:Biodegradation, Environmental; D003035:Cobalt / Q000378:metabolism*; D003460:Crystallization; D017886:Durapatite / Q000378:metabolism*; D007474:Ion Exchange; D007477:Ions; D008855:Microscopy, Electron, Scanning; D012705:Serratia / Q000378:metabolism*; D013324:Strontium / Q000378:metabolism*; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: D007477:Ions; D014867:Water; D003035:Cobalt; D017886:Durapatite; D013324:Strontium