Incorporation of Iron Into Nano Hydroxyapatite Particles Synthesized by the Microwave Process

Abstract

This research focuses on understanding the nature of the Fe ions substituted in hydroxyapatite ((HAP) Ca 10-x Fe x( PO 4)6( OH )2-xÿx: x = 0, 0.2 and 0.4) powder synthesized at temperatures between 500°C and 1000°C and their crystallization. The DSC scan indicates a solid state phase transition at about 757°C for the as-prepared powder HAP. The transformation of HAP to β-tricalcium phosphate (β- TCP , β- Ca 3( PO 4)2) is seen when the powder were heated to 750°C. The sizes of the crystallites were determined to be about 46–51 nm, 33–40 nm and 33–59 nm for Fe content of 0, 0.2 and 0.4 mol%, respectively. The ESR parameters for the Fe 3+ ions, g = 4.23 and 8.93 indicated that the ions were subjected to a rhombic ion crystal field within the HAP structures. The g values of ~2.01 indicated that the particles were super-paramagnetic and ferromagnetic iron nanoparticles, having an average size about 0.2–0.5 μm in length.

Ag-doped hydroxyapatite as efficient adsorbent for removal of Congo red dye from aqueous solution: Synthesis, kinetic and equilibrium adsorption isotherm analysis

“…Hence, the present study was intended to remove CR dye from aqueous solutions using modified hydroxyapatite as a novel and efficient adsorbent at ambient temperature without adjusting pH of treatment solutions. Several methods have been reported for the synthesis of ion incorporated CaHAp, such as solÀgel [21], aqueous precipitation [22], hydrothermal [23], microwave [24] methods. Among all these methods, aqueous precipitation method is facile, economical, energy saving and less time consuming method.…”

Magnetic properties of Co-ferrite-doped hydroxyapatite nanoparticles having a core/shell structure

“…There have been many studies on the fabrication of HAP [13][14][15]. Several studies have looked at insertion of ferrites into the HAP [16,17]. Two of the present authors (WP and IMT) found that the insertion of the spinel ferrite MnFe 2 O 4 through a wet chemistry process resulted in nanoparticles having a core-shell structure (in which the core was made up of the ferrite and the shell of HAP [17]).…”

Microwave Assisted Reactions in Organic Chemistry: A Review of Recent Advances

“…(Mingos et al, 1997). The research areas that rely on the development of large libraries of compounds, such as combinatorial chemistry (Pon-On et al, 2007;Pande et al, 2009;Nuchter et al, 2001) and drug discovery (Sekhon et al, 2010;Santagada et al, 2009) have been motivated due to the ability of microwave heating process in reducing the reaction time.…”