Self-separation of the adsorbent after recovery of rare-earth metals: Designing a novel non-wettable polymer

Mir, Noshin; Castano, Carlos E.; Rojas, Jessika V.; Norouzi, Nazgol; Esmaeili, Atefeh; Mohammadi, Reza

doi:10.1016/j.seppur.2020.118152

Cited by 10 publications

(7 citation statements)

References 80 publications

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“…An important advantage of PPy-CO 2 as a sorbent is the wide range of 2+ and 3+ metal cations that can be preconcentrated and determined by ICP-MS. The versatility of the carboxylic acid group within the polymer to interact with metals classified as hard as well as some borderline soft metals is supported by literature reports describing ligands that contain hard oxygen donor atoms. ,,− …”

Section: Resultsmentioning

confidence: 89%

Synthesis and Characterization of Poly(pyrrole-1-carboxylic acid) for Preconcentration and Determination of Rare Earth Elements and Heavy Metals in Water Matrices

Sunder

Rohanifar

Alipourasiabi

et al. 2021

ACS Appl. Mater. Interfaces

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Pyrrole was N-functionalized with solid carbon dioxide followed by chemical polymerization to create a new airstable, granular, and water-insoluble sorbent, poly(pyrrole-1carboxylic acid) (PPy-CO 2 ). PPy-CO 2 exhibited enhanced affinity for the sorption of metal ions compared to unfunctionalized PPy due to the incorporation of carboxylate functional groups directly onto the polymer backbone. As a freestanding sorbent material, immobilization to an additional solid support is not needed. Sorption, and therefore preconcentration, occurs simultaneously to achieve efficient removal and recovery of metal ions by a pHdependent sorption−desorption mechanism. PPy-CO 2 was evaluated on the analytical scale for the solid-phase extraction of a range of metal ions and found to efficiently preconcentrate rare earth elements (REEs), Th, and heavy metals (Cr, Fe, Cd, and Pb), which allowed quantitation by inductively coupled plasma mass spectrometry (ICP-MS). The impact of sorption parameters, such as solution pH, amount of sorbent, and sorption time, and the effect of desorption flow rate for recovery were investigated and optimized using ultrasound-assisted dispersive solid-phase extraction (UAD-SPE) with ICP-MS analysis. Maximum efficiency for sorption and recovery of most metal ions was achieved at a solution pH of 6.0, 10 mg of sorbent, a sorption time of 5 min, and desorption conditions of 1 mL of 2 M nitric acid applied at a flow rate of 0.25 mL min −1 . Detection limits for REEs and Th ranged from 0.2−3.4 ng L −1 for REEs and Th and 0.9−5.7 ng L −1 for heavy metals. Linear ranges from 0.1−1000 μg L −1 for REEs and 0.1− 500 μg L −1 for heavy metals and Th were also observed. PPy-CO 2 successfully preconcentrated and facilitated the determination of the targeted metal ions in water matrices of varying complexity, including tap water, well water, river water, and produced water samples. These results indicate the potential application of PPy-CO 2 for larger-scale recovery and removal of valuable or hazardous metal ions.

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Section: Resultsmentioning

confidence: 89%

Synthesis and Characterization of Poly(pyrrole-1-carboxylic acid) for Preconcentration and Determination of Rare Earth Elements and Heavy Metals in Water Matrices

Sunder

Rohanifar

Alipourasiabi

et al. 2021

ACS Appl. Mater. Interfaces

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“…To ensure that the surface chemistry of the substrates does not change due to the droplet impact, a freshly produced superhydrophobic sample was used in each experiment. More details regarding surface characterization of the samples used in the current work, including the surface free energy, roughness, and morphology, can be found in our recent comprehensive studies on non-wettable AKD coatings. ,, According to roughness characterization of the fabricated samples, the root mean square (RMS) value of the substrates is approximately 2.92 μm …”

Section: Methodsmentioning

confidence: 99%

“…More details regarding surface characterization of the samples used in the current work, including the surface free energy, roughness, and morphology, can be found in our recent comprehensive studies on non-wettable AKD coatings. 25,34,35 According to roughness characterization of the fabricated samples, the root mean square (RMS) value of the substrates is approximately 2.92 μm. 25 To study the influence of concentration, molecular weight, and ionic nature of surfactants on the impact dynamics and freezing behavior of the solutions, three well-known surfactants, sodium dodecyl sulfate (SDS, anionic), hexadecyltrimethylammonium bromide (CTAB, cationic), and n-decanoyl-n-methylglucamine (MEGA-10, nonionic) were used (Sigma-Aldrich, USA).…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Impact Dynamics and Freezing Behavior of Surfactant-Laden Droplets on Non-Wettable Coatings at Subzero Temperatures

2021

Self Cite

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The present study investigates the impact and freezing behavior of the droplets of surfactant solutions on non-wettable coatings at very low temperatures of −10 to −30 °C. Our goal is to elucidate the critical role of concentration, molecular weight, and ionic nature of surfactants on these phenomena. To achieve this goal, we used sodium dodecyl sulfate (anionic), hexadecyltrimethylammonium bromide (cationic), and n-decanoyl-n-methylglucamine (nonionic) at four concentrations ranging from 0 to 2 × CMC (critical micelle concentration). We captured the impact-freezing of the droplets on superhydrophobic alkyl ketene dimer coatings using a high-speed camera at 5000 frames per second. The results show that the ability of the droplets to spread and retract on the coatings is a function of concentration, ionic nature, and molecular weight of the surfactants, as well as the temperature-dependent viscosity of the solutions. Additionally, surfactant-laden droplets generally demonstrated an accelerated freezing compared to pure water. This might be due to the fact that the presence of surfactants can promote both heterogeneous ice nucleation from within the liquid and a larger solid–liquid interfacial area by filling the air pockets of the surface, leading to enhanced heat transfer. The behavior of the cationic surfactant at certain concentrations was, however, an exception leading to a freezing delay, for which a mechanism will be proposed.

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“…Aqueous solutions of EuCl 2 (1.5 mM, 5.00 mL, pH 5.5) were added to Poly-Prep chromatography columns containing cryptand-modified resin (16 mg, 0.0025 mmol), and the resulting mixtures were agitated in a glovebox. Aliquots (50 μL) were removed at different times (3,5,8,12,15,20,25,30,40,50, and 60 min), and the metal content of the aliquots was measured using ICP−MS.…”

Section: Adsorption Kineticmentioning

confidence: 99%

“…Different solid-phase extractants have been studied with respect to their selectivity for rare-earth elements. − Modifications to the solid supports studied for the isolation of rare-earth elements include changing the size of the pores, degree of crosslinking, and degree of functionalization as well as selection of different ligands or functional groups to include on solid supports. ,,, Modification of solid supports with ligands is an important technique to separate rare-earth elements based on coordinating angle (bite angle), donor atoms, functional groups, cavity size, range of p K a , or denticity. ,,, With increasing specificity of the supported ligand, increased separation efficiencies become possible. Therefore, we hypothesized that 2.2.2-cryptand covalently linked to a solid support would enable the separation of lanthanides from each other as a function of size and charge because 2.2.2-cryptand preferentially binds divalent lanthanides relative to trivalent lanthanides .…”

Section: Introductionmentioning

confidence: 99%

Cryptands on a Solid Support for the Separation of Europium from Gadolinium

Kulasekara,

Kajjam,

Praneeth

et al. 2023

ACS Appl. Mater. Interfaces

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With the great demand for europium in green-energy technologies comes the need for innovative methods to isolate the elements. We introduce a solid−liquid extraction method using a 2.2.2-cryptand-modified solid support to separate europium from gadolinium using their differences in electrochemical potential. The method overcomes challenges associated with the separation of those two ions that have similar coordination chemistry in the +3 oxidation state. A competitive adsorption study in the cryptand system between Eu II /Eu III and Gd III shows greater affinity for Eu II relative to Gd III . After separation from Gd III , Eu was released by oxidizing Eu II to Eu III with 99.3% purity. The purity of separated Eu is unaffected by pH between pH 3.0 and 5.5. Overall, we demonstrate that by modifying a solid support with 2.2.2-cryptand, divalent europium can be separated from trivalent gadolinium based on the differences of affinities of 2.2.2cryptand for the two ions.

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Self-separation of the adsorbent after recovery of rare-earth metals: Designing a novel non-wettable polymer

Cited by 10 publications

References 80 publications

Synthesis and Characterization of Poly(pyrrole-1-carboxylic acid) for Preconcentration and Determination of Rare Earth Elements and Heavy Metals in Water Matrices

Synthesis and Characterization of Poly(pyrrole-1-carboxylic acid) for Preconcentration and Determination of Rare Earth Elements and Heavy Metals in Water Matrices

Impact Dynamics and Freezing Behavior of Surfactant-Laden Droplets on Non-Wettable Coatings at Subzero Temperatures

Cryptands on a Solid Support for the Separation of Europium from Gadolinium

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