The effects of salt concentration on cation complexation in triblock-polyether electrolyte

Silva, R. A.; Silva, G. Goulart; Moreira, R. L.; Pimenta, M. A.

doi:10.1039/b302013d

Cited by 14 publications

(11 citation statements)

References 25 publications

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“…The physics controlling the interactions between ions and flexible chain macromolecules is reflected in such diverse phenomena as the complexation of polymer and micelles, polymer−salt blends, phase separation in systems containing polymer, and the partitioning and extraction of charge species (proteins, cations, anions) in aqueous two-phase systems (ATPS). − In the last several years there has been a considerable effort toward improving the understanding of ion partitioning behavior in these biphasic systems …”

Section: Introductionmentioning

confidence: 99%

Nitroprusside−PEO Enthalpic Interaction as a Driving Force for Partitioning of the [Fe(CN)₅NO]^2- Anion in Aqueous Two-Phase Systems Formed by Poly(ethylene oxide) and Sulfate Salts

Silva

Aquino

et al. 2006

J. Phys. Chem. B

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Ions are known to concentrate in the salt-enriched phase of aqueous two-phase systems, with the only known exception being the pertechnetate anion, TcO(4)(-). We have discovered a second ion, nitroprusside anion (NP), which is markedly transferred from the salt phase to the polymer phase. The partitioning behavior of [Fe(CN)(5)NO](2-) anion was investigated in ATPS formed by poly(ethylene oxide) of molar mass 3350 and 35000 g mol(-1), and different sulfate salts (Na(2)SO(4), Li(2)SO(4), and MgSO(4)). On the basis of a model, the nitroprusside high affinity for the macromolecular phase was attributed to an enthalpic specific interaction between the anion and ethylene oxide unit. Partition coefficients increased exponentially with tie-line length increase, reaching values as high as 1000 and showing a relationship very dependent on the salt nature, but independent of the polymer molar mass.

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Section: Introductionmentioning

confidence: 99%

Nitroprusside−PEO Enthalpic Interaction as a Driving Force for Partitioning of the [Fe(CN)₅NO]^2- Anion in Aqueous Two-Phase Systems Formed by Poly(ethylene oxide) and Sulfate Salts

Silva

Aquino

et al. 2006

J. Phys. Chem. B

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“…The use of ionic liquids (ILs) in various areas of chemistry has increased tremendously over the past few years, for example, in catalysis, separation science, and in electrochemical applications, among others. [1][2][3][4][5][6][7][8][9][10][11] Their advantageous properties often include negligible vapor pressure and variation in liquid characteristics from hydrophilic to hydrophobic salts. These tunable properties make them suitable for many applications, yet despite their increasing popularity, ILs have only recently begun to see use in the area of structural materials science.…”

Section: Introductionmentioning

confidence: 99%

Ionic liquids as solvent and solvent additives for the synthesis of sol–gel materials

et al. 2005

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“…However, increasing the salt concentration in the aqueous layer crushed the PEG molecules’ hydrated layer. The water molecules were transferred from the PEG middle layer to the salt bottom layer by lowering PEG hydrophilicity [ 68 ]. Thus, this influenced the extraction of hydrophilic RE-DTPA complexes.…”

Section: Resultsmentioning

confidence: 99%

Rare Earth Group Separation after Extraction Using Sodium Diethyldithiocarbamate/Polyvinyl Chloride from Lamprophyre Dykes Leachate

et al. 2022

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This study presents the first application of sodium diethyldithiocarbamate/polyvinyl chloride (DdTC/PVC) as a novel adsorbent for rare earth element (REE) sorption from leach liquors. DdTC/PVC has higher adsorption properties than other sorbents, the synthesis of DdTC/PVC is more accessible than other resins, and it is considered a more affordable sorbent. The three-liquid-phase extraction technique (TLPE) was applied to separate REEs into light, middle, and heavy rare earth elements as groups. The TLPE is an excellent achievable technique in the separation of REEs. DdTC/PVC was prepared as a sorbent to sorb rare-earth ions in chloride solution. It was described by XRD, SEM, TGA, and FTIR. The factors pH, initial rare-earth ion concentration, contact time, and DdTC/PVC dose were also analyzed. The ideal pH was 5.5, and the ideal equilibration time was found to be 45 min. The rare-earth ion uptake on DdTC/PVC was 156.2 mg/g. The rare-earth ion sorption on DdTC/PVC was fitted to Langmuir and pseudo-2nd-order models. The rare-earth ions’ thermodynamic adsorption was spontaneous and exothermic. In addition, rare-earth ion desorption from the loaded DdTC/PVC was scrutinized using 1 M HCl, 45 min time of contact, and a 1:60 S:L phase ratio. The obtained rare earth oxalate concentrate was utilized after dissolving it in HCl to extract and separate the RE ions into three groups—light (La, Ce, Nd, and Sm), middle (Gd, Ho, and Er), and heavy (Yb, Lu, and Y)—via three-liquid-phase extraction (TLPE). This technique is simple and suitable for extracting REEs.

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The effects of salt concentration on cation complexation in triblock-polyether electrolyte

Cited by 14 publications

References 25 publications

Nitroprusside−PEO Enthalpic Interaction as a Driving Force for Partitioning of the [Fe(CN)₅NO]^2- Anion in Aqueous Two-Phase Systems Formed by Poly(ethylene oxide) and Sulfate Salts

Nitroprusside−PEO Enthalpic Interaction as a Driving Force for Partitioning of the [Fe(CN)₅NO]^2- Anion in Aqueous Two-Phase Systems Formed by Poly(ethylene oxide) and Sulfate Salts

Ionic liquids as solvent and solvent additives for the synthesis of sol–gel materials

Rare Earth Group Separation after Extraction Using Sodium Diethyldithiocarbamate/Polyvinyl Chloride from Lamprophyre Dykes Leachate

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The effects of salt concentration on cation complexation in triblock-polyether electrolyte

Cited by 14 publications

References 25 publications

Nitroprusside−PEO Enthalpic Interaction as a Driving Force for Partitioning of the [Fe(CN)5NO]2- Anion in Aqueous Two-Phase Systems Formed by Poly(ethylene oxide) and Sulfate Salts

Nitroprusside−PEO Enthalpic Interaction as a Driving Force for Partitioning of the [Fe(CN)5NO]2- Anion in Aqueous Two-Phase Systems Formed by Poly(ethylene oxide) and Sulfate Salts

Ionic liquids as solvent and solvent additives for the synthesis of sol–gel materials

Rare Earth Group Separation after Extraction Using Sodium Diethyldithiocarbamate/Polyvinyl Chloride from Lamprophyre Dykes Leachate

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Product

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Nitroprusside−PEO Enthalpic Interaction as a Driving Force for Partitioning of the [Fe(CN)₅NO]^2- Anion in Aqueous Two-Phase Systems Formed by Poly(ethylene oxide) and Sulfate Salts

Nitroprusside−PEO Enthalpic Interaction as a Driving Force for Partitioning of the [Fe(CN)₅NO]^2- Anion in Aqueous Two-Phase Systems Formed by Poly(ethylene oxide) and Sulfate Salts