Research Trends on Separation and Extraction of Rare Alkali Metal from Salt Lake Brine: Rubidium and Cesium

Gao, Li; Ma, Guihua; Zheng, Youxiong; Tang, Yan; Xie, Guanshun; Liu, Bingxin; Duan, Ji’an

doi:10.1080/07366299.2020.1802820

Cited by 31 publications

(10 citation statements)

References 61 publications

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“…In comparison, the determined Cs + /Li + and Cs + /K + selectivity for MIL-53-NH 2 membranes were up to 315 and 143, respectively. These selectivity ratios exceeded those of traditional separation processes by more than 10 fold . Interestingly, the selectivity achieved by MIL-53-Cl was 73 for Cs + /Li + and 39 for Cs + /K + , almost 5 folds lower than MIL-53-NH 2 , even though the MIL-53-Cl pore is just 0.4 Å larger.…”

Section: Resultsmentioning

confidence: 85%

“…These selectivity ratios exceeded those of traditional separation processes by more than 10 fold. 45 Interestingly, the selectivity achieved by MIL-53-Cl was 73 for Cs + /Li + and 39 for Cs + /K + , almost 5 folds lower than MIL-53-NH 2 , even though the MIL-53-Cl pore is just 0.4 Å larger. To understand the manifest difference between the selectivity of these pores, we constructed a MOF composite membrane from the pristine MIL-53 and evaluated the pore structure as well as the selectivity (Figures S8 and S9).…”

Section: ■ Results and Discussionmentioning

confidence: 96%

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Ionic Sieving at Sub-Angstrom Precision Enabled by Metal Organic Frameworks

Zeng,

Yang,

et al. 2023

ACS Appl. Mater. Interfaces

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The demand for cesium is expanding rapidly in light of its necessity in high-tech industries. Thus, technologies that can efficiently extract cesium from the sources are critically needed. Here, the metal−organic framework (MOF) membranes created from −Cl and −NH 2 functionalized MIL-53 enabled highly selective transport of cesium ions. The angstrom-scale pore windows in these MOFs conduct Cs + ions at high throughput, 2 orders of magnitude faster than other marginally larger ions. Ascribed to size sieving effects, MIL-53-NH 2 containing 6.6 Å size channels realized an exceedingly high Cs + /Li + selectivity up to ∼315. The rapid transport of Cs + ions relative to other ions is greatly dependent on the precision of the angstrom-scale pores. Our work highlights the enormous potential of realizing high ion selectivity with MOFs and drives the further development of these materials in a variety of advanced separations.

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Section: Resultsmentioning

confidence: 85%

Section: ■ Results and Discussionmentioning

confidence: 96%

Ionic Sieving at Sub-Angstrom Precision Enabled by Metal Organic Frameworks

Zeng,

Yang,

et al. 2023

ACS Appl. Mater. Interfaces

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“…A hundred molecules consisting of one Cs + ion, 184 ammonia, and 815 water were put inside a simulation box with a side length of 31.79 Å, corresponding to the density of 18.6% ammonia in water at 298.15 K, that is, 0.927 g/cm 3 . The Berendsen weak-coupling algorithm with a relaxation time of 0.1 ps was applied to preserve temperature at 298.15 K [38].…”

Section: Methodsmentioning

confidence: 99%

A hybrid forces Quantum Mechanical Charge Field Molecular Dynamics of Cs⁺ ion in aqueous ammonia: A solvation lability, “structure breaking” phenomenon and hydrogen bond properties

Hidayat,

Prasetyo,

Pranowo

2023

Int J of Quantum Chemistry

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The dynamics and structure of Cs+ solvation in an aqueous ammonia solution have been investigated using the Quantum Mechanical Charge Field Molecular Dynamics (QMCF‐MD) simulation method. The system contained 18.6% ammonia in aqueous solution at 298.15 K. The QM region was set to a radius of 7.0 Å to include the first and second solvation shells. The Hartree‐Fock (HF) level was applied to calculate the ion‐ligand and ligand–ligand interactions in the QM region using the LANL2DZ‐ECP basis set for the ion and DZP‐Dunning for the ligands. The radial distribution revealed only one solvation shell, indicating a labile solvation structure. The various coordination number of ligands suggests an instant exchange between them. The mean residence times of 1.29 and 0.9 ps were less than in the pure water and liquid ammonia system, indicating higher mobility ligands of the aqueous ammonia system. The preferential factor 0.55 supports the hypothesis that the Cs+ ion prefers to be dissolved in water. As the ligands moves further away from the ion, the observed number of hydrogen bonds increases, revealing the “structure‐breaking” property of the Cs+ ion. The minimum angle ligand‐ion‐ligand tends to be higher near the ion, confirming this phenomenon.

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“…Consequently, we considered that the extraction of Rb + with DCH18C6 in [C 2 mim + ][NTf 2 -] involves a cation-exchange mode. So the expression for the Rb + participation into the organic phase can be presented as: (5) According to Eq (5), the extraction equilibrium constant (K e ) can be expressed as: (6) The distribution ratio of rubidium (D Rb ) is equal to the ratio of the total concentration of rubidium ion in the organic phase to its total concentration in the aqueous phase. Therefore, K e can be simplifi ed to: (7) The logarithm of the two sides of the Eq (7) can be obtained: (8) where the value of K e is only related to the temperature for an extraction reaction.…”

Section: Extraction Mechanismmentioning

confidence: 99%

Extraction of rubidium ion from brine solutions by dicyclohexano-18-crown-6 / ionic liquid system

Huang

Ma²,

et al. 2023

Polish Journal of Chemical Technology

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Separation among rubidium and potassium ions from salt lake brines remains challenging. In this work, a typical room temperature ionic liquid 1-ethyl-3-metyhlimidazaolium bis(trifluoromethylsulfonyl)imide ([C2mim+][NTf2 –]) was used as diluent and synergistic extractant, dicyclohexano-18-crown-6 (DCH18C6) was used as extractant to extract rubidium ions from brine solutions which contain high concentrations of potassium ions was investigated. Under the optimal conditions, the single extraction efficiency of rubidium ions was up 93.63%. The thermodynamic parameters of the rubidium ion extraction were obtained. Based on the slope analysis method, the extracted species in the organic phase were ascertained as 1:1 complex. UV-visible has been performed to investigate the ion concentration of ionic liquid before and after the interaction of metal ions and ligands. Rubidium ions in [Rb · DCH18C6]+ complex were stripped by 2.5 mol · L–1 NH4NO3. The extraction system offers high efficiency, simplicity and environmentally friendly application prospect to separate rubidium from brine solutions.

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Research Trends on Separation and Extraction of Rare Alkali Metal from Salt Lake Brine: Rubidium and Cesium

Cited by 31 publications

References 61 publications

Ionic Sieving at Sub-Angstrom Precision Enabled by Metal Organic Frameworks

Ionic Sieving at Sub-Angstrom Precision Enabled by Metal Organic Frameworks

A hybrid forces Quantum Mechanical Charge Field Molecular Dynamics of Cs⁺ ion in aqueous ammonia: A solvation lability, “structure breaking” phenomenon and hydrogen bond properties

Extraction of rubidium ion from brine solutions by dicyclohexano-18-crown-6 / ionic liquid system

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Research Trends on Separation and Extraction of Rare Alkali Metal from Salt Lake Brine: Rubidium and Cesium

Cited by 31 publications

References 61 publications

Ionic Sieving at Sub-Angstrom Precision Enabled by Metal Organic Frameworks

Ionic Sieving at Sub-Angstrom Precision Enabled by Metal Organic Frameworks

A hybrid forces Quantum Mechanical Charge Field Molecular Dynamics of Cs+ ion in aqueous ammonia: A solvation lability, “structure breaking” phenomenon and hydrogen bond properties

Extraction of rubidium ion from brine solutions by dicyclohexano-18-crown-6 / ionic liquid system

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Product

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A hybrid forces Quantum Mechanical Charge Field Molecular Dynamics of Cs⁺ ion in aqueous ammonia: A solvation lability, “structure breaking” phenomenon and hydrogen bond properties