Microwave-assisted synthesis of hydroxyapatite for the removal of lead(II) from aqueous solutions

Hasret, Erdem; Ipekoglu, Mehmet; Altıntaş, Sabri; Ipekoglu, Nursen A

doi:10.1007/s11356-012-0776-5

Cited by 13 publications

(4 citation statements)

References 54 publications

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“…Hydroxyapatite (HAP) has a chemical composition similar to bones and teeth. 1 , 2 Methods to prepare it include reacting calcium nitrate with phosphoric acid, 3 disodium creatine phosphate, 4 ammonium hydrogen phosphate, 5 and phosphorus pentoxide, 6 as well as combining calcium hydroxide with phosphoric acid. 7 Temperature and pH may be adjusted to control physical properties, including mechanical strength, particle size, and pore size.…”

Section: Introductionmentioning

confidence: 99%

“…Hydroxyapatite (HAP) has a chemical composition similar to bones and teeth. , Methods to prepare it include reacting calcium nitrate with phosphoric acid, disodium creatine phosphate, ammonium hydrogen phosphate, and phosphorus pentoxide, as well as combining calcium hydroxide with phosphoric acid . Temperature and pH may be adjusted to control physical properties, including mechanical strength, particle size, and pore size. − During synthesis and drying, the calcium phosphate goes through intermediate amorphous stages until the thermodynamically stable phase is formed with a Ca/P ratio of 1.67. − The Ca/P ratio can vary between 1.5–1.67 and is affected by reaction time and reactant concentration. − Drying temperature and duration influence the final structure and degree of crystallinity.…”

Section: Introductionmentioning

confidence: 99%

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Modification of Hydroxyapatite with Ion-Selective Complexants: 1-Hydroxyethane-1,1-diphosphonic Acid

Daniels

Lyczko

Nzihou

et al. 2015

Ind. Eng. Chem. Res.

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Hydroxyapatite (HAP) was modified with 1-hydroxyethane-1,1-diphosphonic acid (HEDP), and its effect on divalent metal ion binding was determined. HAP was synthesized from calcium hydroxide and phosphoric acid. After calcination, it was modified with HEDP, and the influence of time and temperature on the modification was investigated. HEDP incorporation increased as its initial solution concentration increased from 0.01 to 0.50 M. Unmodified and modified HAP were characterized using Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, and specific surface area analysis. Ca/P ratios, acid capacities, and phosphorus elemental analyses gave the effect of modification on composition and surface characteristics. A high reaction temperature produced new phosphonate bands at 993, 1082, and 1144 cm–1 that indicated the presence of HEDP. HAP modification at a high temperature–long reaction time had the highest HEDP loading and gave the sharpest XRD peaks. The emergence of new HAP–HEDP strands was observed in SEM images for treated samples while EDS showed high phosphorus contents in these strands. Modified HAP had a high acid capacity from the additional P–OH groups in HEDP. The P(O)OH groups maintain their ability to bind metal ions within the HAP matrix: contacting the modified HAP with 10–4 N nitrate solutions of five transition metal ions gives an affinity sequence of Pb(II) > Cd(II) > Zn(II) > Ni(II) > Cu(II). This result is comparable to that of commercially available di(2-ethylhexyl)phosphoric acid, a common solvent extractant, and the trend is consistent with the Misono softness parameter of metal ion polarizabilities.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modification of Hydroxyapatite with Ion-Selective Complexants: 1-Hydroxyethane-1,1-diphosphonic Acid

Daniels

Lyczko

Nzihou

et al. 2015

Ind. Eng. Chem. Res.

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“…34 HA is the most basic calcium orthophosphate, 35 which is insoluble in neutral and basic medium. Reported data [36][37][38] indicate that nHA could adsorb divalent metals. 39 The mechanisms of the cation retention include: ion exchange, 40,41 absorption, 42 precipitation, 43 and surface complexation.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of NiW–nHA composite catalyst for hydrocracking

et al. 2012

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The synthesis, characterization and catalytic capability of the NiW-nano-hydroxyapatite (NiW-nHA) composite were investigated in this paper. The NiW-nHA catalyst was prepared by a co-precipitation method. Then Fourier transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM), X-ray diffraction (XRD) and energy dispersive spectroscopy (EDX) were used to analyze this material. In addition, the catalytic capacity of the NiW-nHA composite was also examined by FT-IR and gas chromatography (GC). The results of FT-IR analysis indicated that Ni, W and nHA combined closely. TEM observation revealed that this catalyst was needle shaped and the crystal retained a nanometer size. XRD data also suggested that a new phase of CaWO(4) appeared and the lattice parameters of nHA changed in this system. nHA was the carrier of metals. The rates of Ni/W-loading were 73.24% and 65.99% according to the EDX data, respectively. Furthermore, the conversion of 91.88% Jatropha oil was achieved at 360 °C and 3 MPa h(-1) over NiW-nHA catalyst. The straight chain alkanes ranging from C(15) to C(18) were the main components in the production. The yield of C(15)-C(18) alkanes was up to 83.56 wt%. The reaction pathway involved hydrocracking of the C═C bonds of these triglycerides from Jatropha oil. This paper developed a novel non-sulfided catalyst to obtain a "green biofuel" from vegetable oil.

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“…It can also be chemically synthesized and synthetic HAP is used for bone tissue engineering 39 . Like bones in humans, HAP has a strong tendency to absorb Pb [40][41][42][43][44][45] (exchanging Ca 2+ for Pb 2+ ) and transforms to hydroxylpyromorphite (Pb-HAP) 46 . The latter has a miniscule solubility product of 10 −77 over the pH range of 3-10 and is, hence, a very stable form of insoluble Pb under a variety of environmental conditions 47 .…”

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confidence: 99%

Spherical hydroxyapatite nanoparticle scaffolds for reduced lead release from damaged perovskite solar cells

et al. 2022

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Perovskite solar cells continue to attract interest due to their facile preparation and high power conversion efficiencies. However, the highest efficiency perovskite solar cells inevitably contain lead, which raises concerns over contamination of drinking water when a solar module is broken and then flooded. We previously showed that conventional synthetic hydroxyapatite (HAP) nanoparticles could capture some of the lead from broken solar cells, but the amount of lead released was well above the safe drinking water level. Here, we modify the HAP synthesis to prepare new spherical-HAP (s-HAP) nanoparticles with a 60% increase in the Pb absorption capacity. We blend s-HAPs with TiO2 nanoparticles to construct mixed scaffolds and investigate their effect on (FAPbI3)0.97(MAPbBr3)0.03 solar cell performance and lead capture. Replacement of 80% of the TiO2 nanoparticles with s-HAP causes the power conversion efficiency to increase from 18.61% to 20.32% as a result of decreased charge carrier recombination. Lead contamination of water from devices subjected to simulated hail damage followed by flooding is shown to decrease exponentially with increasing s-HAP content. The lead concentration in water after 24 h is below the US safe water drinking limit.

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Microwave-assisted synthesis of hydroxyapatite for the removal of lead(II) from aqueous solutions

Abstract: This study indicates that easily and rapidly synthesized HA by microwave-assisted precipitation method could be used as an efficient adsorbent for removal of lead(II) from aqueous solutions.

Cited by 13 publications

References 54 publications

Modification of Hydroxyapatite with Ion-Selective Complexants: 1-Hydroxyethane-1,1-diphosphonic Acid

Modification of Hydroxyapatite with Ion-Selective Complexants: 1-Hydroxyethane-1,1-diphosphonic Acid

Preparation and characterization of NiW–nHA composite catalyst for hydrocracking

Spherical hydroxyapatite nanoparticle scaffolds for reduced lead release from damaged perovskite solar cells

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