Hydroxyapatite/NiFe2O4 superparamagnetic composite: Facile synthesis and adsorption of rare elements

Attia, Mohamed A.; Moussa, Saber I.; Sheha, Reda R.; Someda, H. H.; Saad, E. A.

doi:10.1016/j.apradiso.2018.12.003

Cited by 26 publications

(8 citation statements)

References 38 publications

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“…Hydroxyapatite (HAp) is part of the mineral sorbents that were tested for metal sorption [39,[49][50][51][52][53][54]. Porous hydroxyapatite binds up to 0.47 mmol U g − 1 [49].…”

Section: Characterization Of Materialsmentioning

confidence: 99%

“…For Nd(III) and Sm(III), sorption capacities as high as 2.24 mmol Nd g − 1 and 2.46 mmol Sm g − 1 were reported for nano-hydroxyapatite (n-HAp) [52]. Managing nanoparticles for the treatment of large water streams require complex solid/liquid separation; therefore, n-HAp is frequently associated to supports that improve the reactivity and the readily solid/liquid separation (surface deposition [55]; incorporation of magnetic particles [51,52], functionalization [56] etc. ).…”

Section: Characterization Of Materialsmentioning

confidence: 99%

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Synthesis of polyamide 6/nano-hydroxyapatite hybrid (PA6/n-HAp) for the sorption of rare earth elements and uranium

Hassanein

Masoud

Mohamed

et al. 2021

Journal of Environmental Chemical Engineering

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Polyamide (PA6) and hydroxyapatite (n-HAp) have intrinsic sorption properties for metal ions. Their association by melt compounding allows manufacturing a composite material (PA6/n-HAp) efficient for the binding of uranyl and rare earth metal ions (REEs) in acidic solution (in the pH range 2-2.5). The composite shows enhanced sorption capacities (5-7 times) compared with single PA6 material. The structuration of the material slightly improves textural properties but contributes to improve the accessibility and availability of reactive groups (including by size distribution). Metal sorption proceeds mainly through complexation of amide reactive groups as shown by FTIR characterization (modification of the environment of C --O and NH groups) rather than ionexchange/electrostatic attraction. Maximum sorption capacities approach 0.34 mmol U g − 1 , 0.49 mmol Er g − 1 and 0.70 mmol Nd g − 1 : the preference may be correlated to the covalent rather than ionic character of these metal ions. Uptake kinetics are relatively slow (requiring up to 6− 8 h, under selected experimental conditions): the textural properties of the composite (pore size: 2.6 nm) limit the mass transfer properties (though slightly enhanced compared with PA6 precursor). The resistance to intraparticle diffusion constitutes the major con-trolling step for uptake kinetics. Nitric acid is the most efficient eluent for the desorption of loaded metals (ef-ficiency exceeds 94 %); noticeably U(VI) elution is optimal at 1 M HNO 3 concentration, contrary to REEs that require lower concentration (i.e., 0.1 M). Preliminary tests on sulfuric acid leachates of Egyptian ores demon-strate that the sorbent maintains good sorption properties for REEs and U despite the complexity of the solution. The sorbent has a marked preference for REEs, U and Th against base and alkali metals.

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“…Hydroxyapatite (HAp) is part of the mineral sorbents that were tested for metal sorption [39,[49][50][51][52][53][54]. Porous hydroxyapatite binds up to 0.47 mmol U g − 1 [49].…”

Section: Characterization Of Materialsmentioning

confidence: 99%

Section: Characterization Of Materialsmentioning

confidence: 99%

Synthesis of polyamide 6/nano-hydroxyapatite hybrid (PA6/n-HAp) for the sorption of rare earth elements and uranium

Hassanein

Masoud

Mohamed

et al. 2021

Journal of Environmental Chemical Engineering

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“…This behavior could be referred to the fact that EDTA formed a complex with Eu(III) with a stability constant higher than that of its complex with Ce(III). [ 6 ] The stability constant of the EDTA–Eu complex has the value 17.35 while that of the EDTA–Ce complex is 15.98. Furthermore, Ce(III) ions were easily eluted from loaded samples compared with Eu(III) ions using 0.01 m AlCl 3 .…”

Section: Resultsmentioning

confidence: 99%

“…Various methods such as selective precipitation, ion exchange, [ 6 ] solvent extraction, [ 7 ] membrane filtration, [ 8 ] and sorption [ 9 ] are employed in separation of different lanthanide elements from aqueous solutions. Among them, the sorption approach is widely used in treatment of REEs‐bearing solutions due to its multiple superiorities of easy operation, low cost, high availability, and favorable removal performance.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Sorptive Ability of Synthesized Graphene Oxide‐Metal Oxide Composite to Remove Certain Lanthanides

Sheha

Mekawy

Someda

et al. 2020

CLEAN Soil Air Water

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A metal oxide decorated graphene oxide composite (GO-MO) is prepared via fixation of manganese dioxide (MnO 2) on the surface of graphene oxide (GO). The composite is used as a sorbent for the separation of europium and cerium ions from aqueous solutions. The synthesized materials are characterized using scanning electron microscopy, thermogravimetric analysis, X-ray diffraction, Raman spectroscopy, and Fourier transform infrared spectroscopy. The role of different variables on the sorptive ability of these materials is studied. Two simplified kinetic models, pseudo-first order and pseudo-second order, are applied to describe the kinetics of the sorption process. It is found that sorption of Eu(III) and Ce(III) ions on the synthesized sorbents could be described more favorably by the pseudo-second-order kinetic model. Sorption data are analyzed with Freundlich and Langmuir isotherm models. Desorption of europium and cerium ions from loaded sorbents is carried out using different eluents. Eu(III) ions are easily desorbed from loaded samples using 0.01 m EDTA while Ce(III) ions are easily eluted using 0.01 m AlCl 3. The obtained data clarify that the synthesized composite could be considered as a promising candidate for preconcentration and separation of some lanthanide elements from aqueous solutions.

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“…In the case of terbium, some adsorbents associated to its recovery from solutions included: 1-(2pyridylazo)-2-naphthol (PAN) doped hybrid silica [3], nanoporous calcium alginate/carboxymethyl chitosan microbiocomposite powder containing Ni0.2Zn0.2Fe2.6O4 magnetic nanoparticles [4,5], magnetic CMC bionanocomposite containing a novel biodegradable nanoporous polyamide [6], lignocellulosic biomass [7], calcium alginate/poly(pyrimidine-thiophene-amide) [8], graphite nanoplatelets/magnetite [9], hydroxyapatite/NiFe2O4 composite [10], torrefied poplar-biomass [11], nZVI-montmorillonite [12].…”

Section: Introductionmentioning

confidence: 99%

Application of a Low-Cost Cellulose-Based Bioadsorbent for the Effective Recovery of Terbium Ions from Aqueous Solutions

Alcaraz¹,

Saquinga²,

López³

et al. 2020

Preprint

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Preparation of a low-cost cellulose-based bioadsorbent from the cellulosic material extracted from the rose stems (CRS) was carried out; rose stems were considered agricultural wastes. After the required pretreatment of this waste, and its further treatment with an acidic mixture of acetic and nitric acids, the CRS product was yielded. The resulting bioadsorbent was characterized by several techniques, such as X-ray diffraction, which revealed diffraction maxima related to cellulose structure, whose calculated crystallinity index (CrI) was 75 %. In addition, Fourier Transform Infrared spectroscopy (FTIR), 13C Nuclear Magnetic Resonance (NMR), and X-ray Photoelectron Spectroscopy (XPS) showed signs of acetylation of the sample, also, the thermal properties of the solid was evaluated through Thermogravimetric Analysis (TGA). Scanning Electron Microscopy (SEM) showed cellulose fibers before and after the adsorption process, some particles with not regular shapes were also observed. The CRS bioadsorbent was used in the effective adsorption of valuable Tb(III) from aqueous solution. The adsorption data resulted in a better fit to the Freundlich isotherm, and pseudo-second-order kinetic models; however, chemisorption had not been ruled out. Finally, desorption experiments revealed a recovery of terbium ions with an efficiency of 97 % from terbium-loaded bioadsorbent.

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Hydroxyapatite/NiFe2O4 superparamagnetic composite: Facile synthesis and adsorption of rare elements

Cited by 26 publications

References 38 publications

Synthesis of polyamide 6/nano-hydroxyapatite hybrid (PA6/n-HAp) for the sorption of rare earth elements and uranium

Synthesis of polyamide 6/nano-hydroxyapatite hybrid (PA6/n-HAp) for the sorption of rare earth elements and uranium

Assessing the Sorptive Ability of Synthesized Graphene Oxide‐Metal Oxide Composite to Remove Certain Lanthanides

Application of a Low-Cost Cellulose-Based Bioadsorbent for the Effective Recovery of Terbium Ions from Aqueous Solutions

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