Interaction between low molecular weight organic acids and hydroxyapatite with different degrees of crystallinity

Wei, Wei; Zhang, Xiao; Cui, Jing; Wei, Zhao

doi:10.1016/j.colsurfa.2011.09.034

Cited by 57 publications

(38 citation statements)

References 54 publications

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“…The decrease of the adsorption ability was attributed to the increase of the particle size and crystallinity of HAP after calcining at high temperatures. It was generally accepted that the adsorption ability of HAP was controlled by the surface area, which showed a direct dependence on the particle size and crystallinity of HAP [44]. Meanwhile, we had revealed previously the crystallinitydependent defluoridation properties of nanosized HAP, that the poorly crystalline apatite materials derived from lower calcining temperature exhibited higher adsorption capacity for fluoride than those from higher calcining temperature [40].…”

Section: Characterization Of Hapmentioning

confidence: 95%

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Poorly crystalline hydroxyapatite: A novel adsorbent for enhanced fulvic acid removal from aqueous solution

Wei

Yang

Zhong

et al. 2015

Applied Surface Science

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Section: Characterization Of Hapmentioning

confidence: 95%

“…The nanosized HAP adsorbent was prepared by a chemical precipitation method as described in our previous paper [44]. However, a brief description is given below.…”

Section: Preparation and Characterization Of Adsorbentmentioning

confidence: 99%

Poorly crystalline hydroxyapatite: A novel adsorbent for enhanced fulvic acid removal from aqueous solution

Wei

Yang

Zhong

et al. 2015

Applied Surface Science

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“…The results of investigations on C 2 O 4 2-ions adsorption at the hydroxyapatite/NaCl interface are as follows: hydroxyapatite was prepared by the hydrothermal method using CaHPO 4 and Ca(OH) 2 . The surfaces of the obtained hydroxyapatite were characterized using the following methods: XRD, AFM, SEM, nitrogen adsorption/desorption.…”

Section: Discussionmentioning

confidence: 99%

“…The results showed that crystallinity had an enormous effect on adsorption and dissolution of hydroxyapatite. Poorly crystallized (degree of crystallinity X c = 0.23) hydroxyapatite has adsorbed The present article is based on the lecture presented at ICVMTT 34 conference in Kyiv-Ukraine on 20-21 May, 2014. larger amounts of oxalic acids than well-crystallized one (X c = 0.86) [4].…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of hydroxyapatite with adsorbed oxalic acid

Skwarek

2015

J Therm Anal Calorim

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The specific adsorption of oxalic acid ions at the hydroxyapatite interface was investigated by means of the radioisotope method ( 14 C) as a function of oxalic acid ions concentration, NaCl concentration and pH. Application of hydroxyapatite has become extensive in the biomaterial field due to its biocompatibility with human hard tissue. Hydroxyapatite was synthesized using wet methods. Physical properties of the resulting powder were characterized by DTA/TG, XRD, AFM and SEM microscopy. Physicochemical properties characterizing the electrical double layer of the hydroxyapatite/NaCl solution interface were determined. The zeta potential and the adsorption of oxalic acid molecules were studied as a function of pH. The point of zero charge and the isoelectric point of samples were determined: its values are as follows: pH PZC = 7 and pH IEP = 4. Temperature has insignificant influence on pure substance and with oxalic acid adsorbed, as thermal analysis has shown, and characterization of hydroxyapatite structure can be carried out by this thermal analysis. Two phenomena are responsible for oxalic acid adsorption: phosphate group replacement at the hydroxyapatite surface by oxalic ions simultaneous to intraspherical complexes formation.

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“…The sol-gel process is attractive because it uses mild conditions and easily available precursors. Countless literature works have reported the use of this route to prepare calcium-based compounds with applications in biomaterials (Radev et al 2012, Wei et al 2011, Heinemann et al 2011, Jadalannagari et al 2011, Bandeira et al 2011, Chatzistavrou et al 2011, Arcos and Vallet-Regí 2010.…”

Section: Introductionmentioning

confidence: 99%

Sol-gel as methodology to obtain bioactive materials

Ribeiro

Lima

Faria

et al. 2014

An. Acad. Bras. Ciênc.

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We employed the sol-gel methodology to obtain a silica matrix modified with calcium and phosphate ions. We prepared the matrix by hydrolysis and condensation of the precursors triethyl phosphate, calcium nitrate, and tetraethylorthosilicate, which were the sources of phosphate, calcium, and silicon, respectively. We dried and heat-treated the samples at 110 or 900°C and placed them in simulated body fluid (SBF) for three days. We conducted scanning electron microscopy, x-ray diffraction, and infrared spectroscopy analyses, which evidenced that the sample treated at 110°C contained calcium phosphate silicate and hydroxyapatite before and after contact with SBF, respectively. The sample treated at 900°C exhibited a hydroxyapatite phase before and after contact with SBF, but the crystalline phase was more evident after the contact. In conclusion, the sol-gel methodology provided bioactive samples for bone regeneration.

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Interaction between low molecular weight organic acids and hydroxyapatite with different degrees of crystallinity

Cited by 57 publications

References 54 publications

Poorly crystalline hydroxyapatite: A novel adsorbent for enhanced fulvic acid removal from aqueous solution

Poorly crystalline hydroxyapatite: A novel adsorbent for enhanced fulvic acid removal from aqueous solution

Thermal analysis of hydroxyapatite with adsorbed oxalic acid

Sol-gel as methodology to obtain bioactive materials

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