Study of Nano-Hydroxyapatite Adsorption in Heavy Metals

2013 ◽  
Vol 777 ◽  
pp. 15-18 ◽  
Author(s):  
Jiu Xu Liu ◽  
Feng Wang ◽  
Jian Xing Shen ◽  
Qi Hui Lai ◽  
Ying Gai
Keyword(s):  
Aqueous Solutions ◽  
Inductively Coupled Plasma ◽  
Raw Materials ◽  
Calcium Nitrate ◽  
Precipitation Method ◽  
Calcium Nitrate Tetrahydrate ◽  
X Ray Diffraction ◽  
Absorption Function ◽  
Inductively Coupled ◽  
Nitrate Tetrahydrate

nanohydroxyapatite (nanoHA) powders were prepared by liquid phase precipitation method, using diammonium hydrogen phosphate and calcium nitrate tetrahydrate as raw materials. It was studied that the prepared nanoHA powders not sintered and sintered at 800°C to adsorption of Cu2+ and Pb2+ in aqueous solutions, respectively. The structure and size of nanoHA powders was investigated by X-ray diffraction (XRD) and the concentrations of Cu2+and Pb2+ in aqueous solutions were tested by inductively coupled plasma emission spectrometer. The results revealed that the nanoHA powders have obvious absorption function for Cu2+ and Pb2+ in aqueous solutions. In addition, the absorption ratio was affected by the size of nanoHA.

A Novel Mixed Hydroxide Method for Hydroxyapatite Preparation

2010 ◽  
Vol 152-153 ◽  
pp. 1399-1403 ◽  
Author(s):  
Mei Mei Zhang ◽  
Hong Shi Zhao ◽  
Hong Liu ◽  
Jian An Liu ◽  
Xiu Xiu Han ◽  
...  
Keyword(s):  
Raw Materials ◽  
Calcium Nitrate ◽  
Nano Particles ◽  
Calcium Nitrate Tetrahydrate ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Nitrate Tetrahydrate ◽  
Pure Phase ◽  
Temperature Time ◽  
Nano Size

Hydroxyapatite(HAP) nanoparticles were synthesized by a mixed hydroxide method using calcium nitrate tetrahydrate[Ca(NO3)24H2O] and phosphoric pentoxide(P2O5) as raw materials. The synthesized nanoparticles were analyzed by x-ray diffraction (XRD), infrared spectroscopy (IR) and transmission electron microscopy (TEM) methods. The effects of reaction temperature, time and concentration of reactants on the microstructure of the nano-particles have been discussed. The results show that the hydroxyapatite particles synthesized have features of uniform morphology, pure phase and well crystallized nano size. The particle size is in the range of 30-200 nm.

Effect of Stirring and Aging Time on the Formation of β-Tricalcium Phosphate (β-TCP) Powder

2016 ◽  
Vol 840 ◽  
pp. 156-159
Author(s):  
Shah Rizal Kasim ◽  
Siti Noor Fazliah Mohd Noor ◽  
Zainal Arifin Ahmad
Keyword(s):  
Electron Microscopy ◽  
Aging Time ◽  
Tricalcium Phosphate ◽  
Calcium Nitrate ◽  
Xrd Analysis ◽  
Precipitation Method ◽  
Calcium Nitrate Tetrahydrate ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Nitrate Tetrahydrate

In this research, the effect of stirring and aging time on the formation of β-tricalcium phosphate (β-TCP) powder was studied. β-TCP powder was synthesized using calcium nitrate tetrahydrate (Ca(NO3)2.4H2O) (0.6M) and diammonium hydrogen phosphate (NH4)2HPO4) (0.4M) via wet precipitation method. The mixture was stirred with different duration (1, 3, 5 and 7 hours) then centrifuged before washed with distilled water (twice) and ethanol followed by drying in oven (80°C, 24 hours). The cake was ground to form powder. The as prepared powder was analyzed using thermo-gravimetric (TGA) to determine the suitable calcinations temperature. TGA results show that the proper calcinations temperature was 800°C. The formation of β-TCP was characterized using X-ray Diffraction (XRD) analysis. Sample with optimum formation of β-TCP phase will choose for further study on the effect of aging time (0.5, 1, 20 and 24 hours). XRD analysis confirmed that sample stirred for 7 hours and aging for 24 hours produced β-TCP as major phase. Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) proved that β-TCP powder form as agglomerated particles

Preparation and Characterization of Hydroxyapatite Whiskers

2013 ◽  
Vol 690-693 ◽  
pp. 404-408
Author(s):  
Ming Hua Huang ◽  
Qing Hua Chen ◽  
Yong Shun Cui ◽  
Wei Bo Zhu
Keyword(s):  
Raw Materials ◽  
Calcium Nitrate ◽  
Precipitation Method ◽  
Calcium Nitrate Tetrahydrate ◽  
Reaction Products ◽  
Ratio Distribution ◽  
Homogeneous Precipitation Method ◽  
Nitrate Tetrahydrate ◽  
Diammonium Hydrogen

The HAP whiskers were prepared by hydrothermal homogeneous precipitation method at the constant temperature. Diammonium hydrogen phosphate, calcium nitrate tetrahydrate, urea and nitric acid were used as the main raw materials. Sorbitol was selected as the template agent and the hydroxyapatite whiskers seeds were served as the inducers. SEM, TEM, XRD and EDS were applied in characterization. The results show that the reaction products are the HAP whiskers with high crystallinity, smooth appearance and no agglomeration; the obtained HAP whiskers are monocrystal and the length-diameter ratio distribution of the HAP whiskers is concentrated at about 30.

scholarly journals Preliminary Archaeopetrological Study of the Lithic Industry From the l’Hort de la Boquera Rock Shelter (Margalef de Montsant, Tarragona, Spain): Applying Mineralogical and Geochemical Techniques

2018 ◽  
Vol 56 ◽  
pp. 23-33
Author(s):  
Mar Rey-Solé ◽  
Maria Pilar García-Argüelles ◽  
Jordi Nadal ◽  
Xavier Mangado ◽  
Anders Scherstén ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Raw Materials ◽  
Raw Material ◽  
Stone Tool ◽  
Petrographic Analysis ◽  
X Ray Diffraction ◽  
Inductively Coupled ◽  
Study Results ◽  
Lithic Industry ◽  
Plasma Mass Spectrometry

The l’Hort de la Boquera site is located in the northeastern part of Iberia and its stone tool assemblage includes up to 25,000 flint artefacts. This is the first approach to the analysis of the raw material through an archaeopetrological study. Results were obtained by use of mineralogi¬cal techniques: macroscopic and petrographic analysis, Scanning Electronic Microscopy (SEM), Micro-Raman and X-Ray diffraction (XRD); additionally, Laser Ablation Inductively Coupled Plasma Mass Spectrometry was applied. It has been possible to discriminate at least four flint categories, the ‘Evaporitic flint type’ (with two local subvarieties – ‘Common evaporitic’ and ‘Garnet’ varieties) that comes from local outcrops of the Ulldemolins Complex, and two flint types that had their origin further afield: the ‘Charophyta flint type’ (coming from the Torrente de Cinca Unit) and the ‘Dark flint type’ (from the La Serra Llarga Formation).These results make this study the most comprehensive analysis of raw materials that has been carried out in the area so far

scholarly journals Crystal Chemistry and Luminescence Properties of Eu-Doped Polycrystalline Hydroxyapatite Synthesized by Chemical Precipitation at Room Temperature

Crystals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 250 ◽  
Author(s):  
Francesco Baldassarre ◽  
Angela Altomare ◽  
Nicola Corriero ◽  
Ernesto Mesto ◽  
Maria Lacalamita ◽  
...  
Keyword(s):  
Fourier Transform ◽  
High Temperature ◽  
Inductively Coupled Plasma ◽  
Room Temperature ◽  
Annealing Temperature ◽  
Chemical Precipitation ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Inductively Coupled

Europium-doped hydroxyapatite Ca10(PO4)6(OH)2 (3% mol) powders were synthesized by an optimized chemical precipitation method at 25 °C, followed by drying at 120 °C and calcination at 450 °C and 900 °C. The obtained nanosized crystallite samples were investigated by means of a combination of inductively coupled plasma (ICP) spectroscopy, powder X-ray diffraction (PXRD), Fourier Transform Infrared (FTIR), Raman and photoluminescence (PL) spectroscopies. The Rietveld refinement in the hexagonal P63/m space group showed europium ordered at the Ca2 site at high temperature (900 °C), and at the Ca1 site for lower temperatures (120 °C and 450 °C). FTIR and Raman spectra showed slight band shifts and minor modifications of the (PO4) bands with increasing annealing temperature. PL spectra and decay curves revealed significant luminescence emission for the phase obtained at 900 °C and highlighted the migration of Eu from the Ca1 to Ca2 site as a result of increasing calcinating temperature.

Thermodynamics of Lead(II) Halide Complex Formation in Calcium Nitrate Tetrahydrate -Acetamide Melts

2001 ◽  
Vol 56 (12) ◽  
pp. 832-836 ◽  
Author(s):  
S. B. Gadzuric ◽  
I. J. Zsigrai ◽  
R. M. Nikolic
Keyword(s):  
Complex Formation ◽  
Aqueous Solutions ◽  
Calcium Nitrate ◽  
Formation Constants ◽  
Calcium Nitrate Tetrahydrate ◽  
Salt Melts ◽  
Nitrate Tetrahydrate ◽  
Different Temperatures ◽  
Dilute Aqueous Solutions ◽  
Melt Composition

Abstract The complex formation between lead(II) ions and chloride and bromide ions in melts of C a(N 03) 2 • 4 H2O • αCH3CONH2 has been studied at different temperatures between 30 and 70 °C. The formation constants of the complexes PbX+ and PbX2 (X = Cl, Br) were determined from em f measurements by means of Ag/AgX electrodes. The dependence of the formation constants for PbCl+ on the solvent melt composition has been analysed. The thermodynamic parameters ΔH011 and ΔS011 for PbX+ complex formation have been estimated. The parameters are compared with the literature data for the same process in dilute aqueous solutions and in some hydrated and anhydrous salt melts.

Apatite Formation on PDMS-Modified SiO2-CaO-P2O5 Hybrids Prepared with Different P2O5 Content by Sol-Gel Method

2004 ◽  
Vol 449-452 ◽  
pp. 1121-1124 ◽  
Author(s):  
Do Won Seo ◽  
J.G. Kim ◽  
Yun Hae Kim ◽  
Chin Myung Whang
Keyword(s):  
Sol Gel ◽  
Calcium Nitrate ◽  
Apatite Formation ◽  
Calcium Nitrate Tetrahydrate ◽  
X Ray Diffraction ◽  
Phosphate Ions ◽  
P2o5 Content ◽  
Sol Gel Process ◽  
Nitrate Tetrahydrate

Bioactive ORMOSILS (organically modified silicate), PDMS-CaO-SiO2-P2O5 with five different P2O5 content (0, 0.01, 0.03, 0.06, 0.09 mol%) have successfully been synthesized by sol-gel process. The hybrids have been prepared with polydimethylsiloxane (PDMS), tetraethoxysilane (TEOS), calcium nitrate tetrahydrate [Ca(NO3)2 4H2O] and triethyl phosphate (TEP) as starting materials and subsequently soaked into the simulated body fluid (SBF) for different period of time and the bioactivity of hybrids was determined by examining the apatite formation on the surface of the specimen by FT-IR, Thin-Film X-ray Diffraction, and Scanning Electron Microscopy (SEM). All of the prepared samples with different P2O5 content showed in vitro bioactivity. It was observed that the increase in P2O5 content up to 0.03 mole % increases the apatite formation compared to P2O5- free hybrids. However, further increase in P2O5 concentration slows down the formation of the apatite layer most probably due to the decrease of pH of SBF by dissolution of a large amount of phosphate ions.

Synthesis of Nanoporous Carbonated Hydroxyapatite Using Non-Ionic Pluronics Surfactant

2013 ◽  
Vol 686 ◽  
pp. 33-43 ◽  
Author(s):  
Nur Farahiyah Mohammad ◽  
Fei Yee Yeoh ◽  
Radzali Othman
Keyword(s):  
Calcium Nitrate ◽  
Precipitation Method ◽  
Calcium Nitrate Tetrahydrate ◽  
Coating Materials ◽  
Carbonated Hydroxyapatite ◽  
Sem Image ◽  
Carbonate Ion ◽  
Nitrate Tetrahydrate ◽  
Bone Substitute Materials ◽  
Co Precipitation

Hydroxyapatite (HA) is a bioceramics that commonly used as bone substitute materials, coating materials and scaffolds in orthopedics. It is well known for its remarkable biocompatibility with natural human tissue. However, synthetic HA is different from biological apatite whereby apatites contain carbonate ion which is about 3-8wt% of the hard tissues of human body which described as carbonated hydroxyapatite (CHA). Hence, synthetic CHA may have a better bioactivity than HA and more widely used as biomaterials. This study described the synthesis and characterization of nanoporous carbonated hydroxyapatite (CHA) by co-precipitation method through self-organization mechanism with different type of non-ionic surfactants (P123 and F127). Diammonium hydrogen phosphate, (NH4)2HPO4 and calcium nitrate tetrahydrate, Ca (NO3)2.4H2O were used as starting materials for preparing the precursor for CHA powder. The ammonium carbonate, NH4HCO3 was used as the main source for carbonate ion. Synthesized powder was characterized using XRD, FESEM, EDS and FTIR. From the XRD result, pure HA phase was obtained for all samples. FTIR analysis results obviously showed the substitution of carbonate ion into the apatite and confirm the formation of CHA. The FTIR results also demonstrated that the surfactants had been removed completely through calcination process. SEM image revealed a sphere-like particle shape of CHA was produced after the calcinations. The mesoporous CHA with pore size 2-12 nm (F127) and 2-8 nm (P123) was synthesized.

scholarly journals Critical raw materials enrichment in bauxite laterite: a case study of diverse parent rock types

2021 ◽  
Vol 882 (1) ◽  
pp. 012024
Author(s):  
R D Nugraheni ◽  
C P Riyandhani ◽  
M Apriniyadi ◽  
D Sunjaya
Keyword(s):  
Inductively Coupled Plasma ◽  
Raw Materials ◽  
Global Market ◽  
X Ray Diffraction ◽  
Metal Compounds ◽  
X Ray ◽  
Inductively Coupled ◽  
Rock Types ◽  
Industrial Manufacture ◽  
Parent Rocks

Abstract High demand in utilizing the mineral and metal for industrial manufacture, which is unequal to the resources, has caused a vulnerable disruption. To compensate stocks in the global market, exploration of raw materials should be carried out for by-products. This study aims to elucidate the enrichment mechanism of Sc, Ga, and Nb elements from the bauxite weathering profile and sediment residue. An observation has been conducted using petrography, mineragraphy, x-ray fluorescence spectroscopy (XRF), x-Ray diffraction (XRD), inductively coupled plasma combined with mass spectrometry (ICP-MS), and scanning electron microscope - energy dispersive spectrometry (SEM-EDS). The results indicate that bauxite ores (gibbsite) hold the metal compounds of Ga, while some iron minerals of goethite and hematite are present as Sc-bearing minerals, and Nb is highly concentrated within saprolite of bauxite. The maximum enrichment of Ga and Sc is observed from the bauxite sample and sediment residue derived from microdiorite pyroxene, which makes up 24.2 - 42.1 ppm and 39.9 - 55.4 ppm, respectively. By contrast, Nb enriched about nine-fold higher in the saprolite zone relative to bauxite produced by weathering of granitic parent rocks. It suggests that metal concentration in the lateritic products depending immensely on the precursor rock types.

scholarly journals Thermal Behavior of Mg-Doped Calcium-Deficient Apatite and Stabilization of β Tricalcium Phosphate

2020 ◽  
Vol 10 (6) ◽  
pp. 6837-6845
Keyword(s):  
Tricalcium Phosphate ◽  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Inductively Coupled ◽  
Β Phase ◽  
Beta Tricalcium Phosphate ◽  
Lower Temperature ◽  
Mg Doped

β-tricalcium phosphate (β-TCP) is a bioceramic with unique osteoinductive and osteoconductive properties. It can be obtained by calcining calcium-deficient apatites (CDHA) at 750°C and above. The reduction of calcining temperature or the stabilization of the β phase, by doping, is therefore of particular interest. This paper investigates the preparation of CDHA with a theoretical 0.05 Mg/(Ca + Mg) ratio and (Ca+Mg)/P = 1.55 via precipitation method, and the resultant powder is calcined at a different temperature ranging from 80 to 715°C. The as-synthesized undoped powder was used as the reference in this study. The effect of calcination temperature and composition were investigated by the aid of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), inductively coupled plasma optical emission spectroscopy (ICP-OES) and scanning electron microscopy (SEM). The study indicated that the powder was pure Mg-doped beta-tricalcium phosphate. The incorporation of Mg within the calcium phosphate lattice promoted the formation and stabilization of the β -TCP phase at a lower temperature.

Sign in / Sign up

Export Citation Format

Share Document