title: Paramagnetic iron-doped hydroxyapatite nanoparticles with improved metal sorption properties. A bioorganic substrates-mediated synthesis.
abstract: This paper describes the synthesis of paramegnetic iron-containing hydroxyapatite nanoparticles and their increased Cu(2+) sorbent capacity when using Ca(2+) complexes of soluble bioorganic substrates from urban wastes as synthesis precursors. A thorough characterization of the particles by TEM, XRD, FTIR spectroscopy, specific surface area, TGA, XPS, and DLS indicates that loss of crystallinity, a higher specific area, an increased surface oxygen content, and formation of surface iron phases strongly enhance Cu(2+) adsorption capacity of hydroxyapatite-based materials. However, the major effect of the surface and morphologycal modifications is the size diminution of the aggregates formed in aqueous solutions leading to an increased effective surface available for Cu(2+) adsorption. Maximum sorption values of 550-850 mg Cu(2+) per gram of particles suspended in an aqueous solution at pH 7 were determined, almost 10 times the maximum values observed for hydroxyapatite nanoparticles suspensions under the same conditions.
authors.affiliation: Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), CCT-La Plata-CONICET, Universidad Nacional de La Plata , La Plata, Buenos Aires 1900, Argentina.
authors.forename: D Fabio
authors.initials: DF
authors.lastname: Mercado
authors.forename: Giuliana
authors.initials: G
authors.lastname: Magnacca
authors.forename: Mery
authors.initials: M
authors.lastname: Malandrino
authors.forename: Aldo
authors.initials: A
authors.lastname: Rubert
authors.forename: Enzo
authors.initials: E
authors.lastname: Montoneri
authors.forename: Luisella
authors.initials: L
authors.lastname: Celi
authors.forename: Alessandra
authors.initials: A
authors.lastname: Bianco Prevot
authors.forename: Mónica C
authors.initials: MC
authors.lastname: Gonzalez
mesh_terms: D000327:Adsorption; D003300:Copper / Q000737:chemistry*; D017886:Durapatite / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D008280:Magnetics; D053758:Nanoparticles / Q000737:chemistry*; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000295:instrumentation* / Q000379:methods
chemical_list: D011108:Polymers; D014874:Water Pollutants, Chemical; D003300:Copper; D017886:Durapatite; D007501:Iron