Synthesis and characterization of arsenate/phosphate hydroxyapatite solid solution

Zhu, Yinian; Zhang, Xuehong; Long, Fei; Liu, Huili; Qian, Meifang; He, Na

doi:10.1016/j.matlet.2009.02.036

Cited by 19 publications

(16 citation statements)

References 11 publications

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“…Crystal volumes also increase with increasing amount of As in synthesized phases. Calculated values are within the error similar to these reported by Zhu et al (2009). In contrary to their results, a linear increase of unit cell parameters with As content is observed.…”

supporting

confidence: 87%

“…Hydroxylapatite -Ca 5 (PO 4 ) 3 OH (HAP) and johnbaumite -Ca 5 (AsO 4 ) 3 OH (AsHAP) are isostructural apatite minerals naturally occurring in the oxidation zones.The main objective of this research is identification of systematic relation between structural and spectral properties and As content in the Ca 5 (PO 4 ) 3 OH, Ca 5 (PO 4 ) 2 (AsO 4 ) OH, Ca 5 (PO 4 ) 1,5 (AsO 4 ) 1,5 OH, Ca 5 (PO 4 )(AsO 4 ) 2 OH, Ca 5 (AsO 4 ) 3 OH. Recent studies of this isomorphic series provide inconsistent results (Lee et al 2009, Zhu et al 2009) indicating controversies and the need for further studies.…”

mentioning

confidence: 99%

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Arsenate substitution in synthetic hydroxylapatite – structural characterization of the Ca5(PO4)x(AsO4)3-xOH solid solution

Chlebowska¹,

Młynarska²,

Manecki³

et al. 2015

geol

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CC-BY 4.0 License requiring that the original work has been properly cited.Occurences of dissolved As in surface and ground waters and observed adverse health effects have emphasized the need for better understanding of reactions that govern As mobility. Precipitation of Ca apatites is quite often used for immobilization of toxic forms P and As in the environment. Hydroxylapatite -Ca 5 (PO 4 ) 3 OH (HAP) and johnbaumite -Ca 5 (AsO 4 ) 3 OH (AsHAP) are isostructural apatite minerals naturally occurring in the oxidation zones.The main objective of this research is identification of systematic relation between structural and spectral properties and As content in the Ca 5 (PO 4 ) 3 3 OH synthesized phases were characterized using scanning electron microscopy with energy dispersive spectroscopy (SEM/EDS), powder X-Ray diffraction (XRD), Infrared absorption spectroscopy (FTIR) and Raman spectroscopy.SEM-EDS analysis confirms that the products of the synthesis are homogeneous. The crystals size varies between 0.1-1.0 μm and increases with the increase of Ascontent. Semi-quantitative elemental analysis by EDS indicates that Ca, O, P and Asare the only elements detected and that the molar proportions correspond to theoretical composition of HAP, Ca 5 (PO 4 ) 2 (AsO 4 )OH, Ca 5 (PO 4 ) 1,5 (AsO 4 ) 1,5 OH, Ca 5 (PO 4 )(AsO 4 ) 2 OH and finally AsHAP.Systematic shift of peaks is apparent on the diffraction patterns. Hexagonal system and P63/m group of symmetry were used for unite cell parameters calculation. The results show systematic increase in the unit cell parameters with substitution of As for P in the series: parameter a from 9.41 to 9.43 and parameter c from 6.85 to 6.87. Crystal volumes also increase with increasing amount of As in synthesized phases. Calculated values are within the error similar to these reported by Zhu et al. (2009). In contrary to their results, a linear increase of unit cell parameters with As content is observed. This is in accordance with Lee et al. (2009).The intensity and the position of PO 4 and AsO 4 absorption bands varies systematically in the FTIR spectra being shifted towards higher wavenumber with increasing As content. The bands originating from CaO and OH (3400 cm -1 ) are practically not affected in all five spectra.

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confidence: 87%

mentioning

confidence: 99%

Arsenate substitution in synthetic hydroxylapatite – structural characterization of the Ca5(PO4)x(AsO4)3-xOH solid solution

Chlebowska¹,

Młynarska²,

Manecki³

et al. 2015

geol

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“…The incorporation of arsenic in the apatite lattice causes a shift in the 'd' spacing. [20] All the compounds have indicated the formation of an apatite phase differing only in reflection location, reflection width and absolute intensity of the diffraction patterns. They show that the obtained crystals consist only of the solid solution phase, which belongs to the apatite type structure.…”

Section: Solid Characterisationsmentioning

confidence: 99%

“…The atomic Ca/(AsþP) ratio was 1.67, which corresponds to a stoichiometric ratio of apatite. [20] XRD, FT-IR and SEM analyses were performed on the solids before and after the dissolution experiments (Figs 1-3). As illustrated in the figures, the results of the analyses on materials before the dissolution were almost indistinguishable from the following reaction.…”

Section: Solid Characterisationsmentioning

confidence: 99%

“…[15] Some synthesis experiments at ambient temperatures were conducted to evaluate the conditions of formation and solubilities of different calcium arsenates. [11,16,17] Hydroxylapatite (HAP) is one of the most stable forms of calcium phosphate and exhibits a low solubility (K sp ¼ 10 À53.02 -10 À53.51 ); however, the solubility of AsHAP [Ca 5 (AsO 4 ) 3 (OH)] is significantly greater than that of HAP, [11,[18][19][20][21][22] which suggested that phosphate substitution in the arsenate compound could significantly reduce their solubilities. [21][22][23][24] The thermodynamic properties of solid solutions have a vital influence on the transport and fate of toxic metals in the environment.…”

Section: Introductionmentioning

confidence: 99%

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Dissolution and solubility of the arsenate - phosphate hydroxylapatite solid solution [Ca5(PxAs1 - xO4)3(OH)] at 25°C

et al. 2011

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Environmental context. Apatites form a large family of minerals and compounds that can incorporate a variety of ions, including arsenate that can substitute for phosphate. Apatites may therefore control the concentration of arsenic in some aqueous environments. This manuscript describes the synthesis and characterisation of the arsenate-phosphate hydroxylapatite solid solution and the solid solution-aqueous solution interaction.Abstract. Nine different members of the arsenate-phosphate hydroxylapatite solid solution [Ca 5 (P x As 1Àx O 4 ) 3 (OH)] were prepared and characterised by various techniques, and then dissolution of the synthetic solids was studied at 258C and pH 2 in a series of batch experiments. The concentrations of aqueous arsenate species increased rapidly at the beginning of the dissolution and reached a steady-state after 480 h. The concentrations of aqueous phosphate species increased very fast initially and reached a peak value within the first hour of dissolution and then declined slowly with time and remained constant after 240-360 h. The solubility of the Ca 5 (P x As 1Àx O 4 ) 3 (OH) solid solution increased and its stability decreased with an increase in the mole fraction of Ca 5 (AsO 4 ) 3 (OH). The dissolution followed or slightly overshot the Lippmann solutus curve, then approached the solutus curve. The Ca 5 (AsO 4 ) 3 (OH)-poor solid solution was in equilibrium with the arsenate-rich aqueous solution.

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Structure and Surface Study of Hydroxyapatite‐Based Materials

Costentin

Drouet

Salles

et al. 2022

Design and Applications of Hydroxyapatite‐Based Catalysts

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In addition to designing catalytic materials ever more active and selective, the emergence of new classes of greener catalysts remains very challenging. The apatite family system with hydroxyapatite (HA) structure appears as a good candidate for catalysis due to its ecocompatibility properties, its sorption ability toward organic molecules, and its tunable composition resulting into modulation of its surface properties. Depending on their mode of preparation, these inexpensive and environment-friendly apatitic calcium phosphates exhibit properties of relevance to catalysis, such as large surface area and various morphologies.However, most studies focused so far on the catalytic performance of these compounds, while the study of structure-reactivity relationships required for rationalized optimization remains rather limited. This chapter aims at providing tools to help understand the catalytic behavior of apatite compounds, giving details about their structure, surface properties, and reactivity; this will include both stoichiometric and nonstoichiometric compounds, sometimes biomimetic and potentially substituted. A special attention is dedicated to recent advances in the characterization of their structural properties (bulk and surface/interphase) that have a strong impact on their reactivity, through both experimental and computational approaches to study the mechanisms occurring in the structure or at the crystals surface, as well as thermodynamic and dynamical properties. Remaining characterization challenges for apatite-based catalysts will also be discussed. 1.an influence on the charges carried by the cation and on the related strength of the Ca-O interaction [127], which results in different adsorption properties with guest molecules. To go further, quantum calculations coupled with NMR (Nuclear Magnetic Resonance) resultsshowed the impact of the presence of OHions on the migration of Ca 2+ as well as the rotation of PO4 3groups [128]. In the hydroxyapatite structure, phosphate ions PO4 3are the largest components of the structure. As such, they provide a primary backbone via 3D compact-like piling, generating interstitial sites for the other ions of the structure. Metal cations such as Ca 2+ occupy two types of crystallographic sites, denoted Ca1 (4 sites per unit formula) and Ca2 (6 sites per unit formula), see Figure 2. Ca1 sites are localized along the trigonal axis with the coordinates (1/4, 3/4, 1/2) and (3/4, 1/4, 1/2), forming linear columns along the c-axis. Ca2 sites in contrast form equilateral triangles at z = 1/4 and z = 3/4 on the sixfold screw (senary) 63 axes. Adjacent Ca1 and Ca2 sites are linked through shared oxygen atoms from PO4 tetrahedra. Ca1 sites generate (distorted) polyhedra where the metal ion is in ninefold coordination, while in Ca2 sites it is in sevenfold coordination.The Ca2 triangles contribute to delimit so-called "apatitic channels" where ions such as OHare axially located (Figure 3) [116,120]. In calcium hydroxyapatite, the Ca2 triangular sites correspond to the narrow...

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Synthesis and characterization of arsenate/phosphate hydroxyapatite solid solution

Cited by 19 publications

References 11 publications

Arsenate substitution in synthetic hydroxylapatite – structural characterization of the Ca5(PO4)x(AsO4)3-xOH solid solution

Arsenate substitution in synthetic hydroxylapatite – structural characterization of the Ca5(PO4)x(AsO4)3-xOH solid solution

Dissolution and solubility of the arsenate - phosphate hydroxylapatite solid solution [Ca5(PxAs1 - xO4)3(OH)] at 25°C

Structure and Surface Study of Hydroxyapatite‐Based Materials

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