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Application of Phosphonium Ionic Liquids as Ion Carriers in Polymer Inclusion Membranes (PIMs) for Separation of Cadmium(II) and Copper(II) from Aqueous Solutions.

Pospiech B - J Solution Chem (2015)

Bottom Line: It was found that the initial fluxes of Cd(II) and Cu(II) increase with increasing chloride ions concentration in the source phase.The selectivity coefficient for Cd(II) over Cu(II) decreases with increasing HCl concentration in the source phase.The results suggest that the separation system presented in this paper can be useful for the removal of Cd(II) from acidic chloride solutions in the presence of Cu(II).

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, Czestochowa University of Technology, Armii Krajowej 19, 42-200 Czestochowa, Poland.

ABSTRACT

Facilitated transport through polymer inclusion membranes (PIMs) is a promising method for simultaneous separation and removal of valuable and toxic metal ions from aqueous solutions. Recently, ionic liquids (ILs) have been used as extracting agents for metal ions due to their unique physicochemical properties. This paper presents research on the facilitated transport of cadmium(II) and copper(II) ions from aqueous chloride solutions through PIMs with phosphonium ILs as new selective ion carriers. Cellulose triacetate membranes containing o-nitrophenyl octyl ether (ONPOE) as a plasticizer and Cyphos IL 101 [trihexyl(tetradecyl)phosphonium chloride] or Cyphos IL 104 [trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl)phosphinate] as the ion carriers have been prepared and applied for investigations. Cd(II) ions were transported preferably from hydrochloric acid solutions containing Cu(II) ions through the PIMs. Higher selectivity coefficient of Cd(II) over Cu(II) (S Cd/Cu) from 0.1 mol·dm(-3) hydrochloric acid was obtained for PIM with Cyphos IL 104 as the ion carrier. The influence of HCl and NaCl concentrations in the source phase on metal ion transport across PIM doped with Cyphos 104 was studied. It was found that the initial fluxes of Cd(II) and Cu(II) increase with increasing chloride ions concentration in the source phase. The selectivity coefficient for Cd(II) over Cu(II) decreases with increasing HCl concentration in the source phase. The results suggest that the separation system presented in this paper can be useful for the removal of Cd(II) from acidic chloride solutions in the presence of Cu(II).

No MeSH data available.


Related in: MedlinePlus

Effect of HCl concentration in the source phase on the permeability coefficient (P) of Cd(II) and Cu(II) across PIM with Cyphos IL 104. PIM: 0.075 g CTA, 2.7 cm3 ONPOE/1 g CTA, 1.5 mol·dm−3 Cyphos IL 104; the source phase: 0.01 mol·dm−3 Cd(II), 0.01 mol·dm−3 Cu(II) in HCl; the receiving phase: mol·dm−3 H2SO4
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Fig4: Effect of HCl concentration in the source phase on the permeability coefficient (P) of Cd(II) and Cu(II) across PIM with Cyphos IL 104. PIM: 0.075 g CTA, 2.7 cm3 ONPOE/1 g CTA, 1.5 mol·dm−3 Cyphos IL 104; the source phase: 0.01 mol·dm−3 Cd(II), 0.01 mol·dm−3 Cu(II) in HCl; the receiving phase: mol·dm−3 H2SO4

Mentions: Cyphos IL 104 was chosen as the selective ion carrier on the basis of the solvent extraction results and the preliminary PIM experiments. The ion carrier was physically immobilized in the polymer matrix containing ONPOE, which was used as the plasticizer as well as solvent for carrier. Hydrochloric acid solutions were used to determine the effect of the acid concentration in the source phase on Cd(II) and Cu(II) transport within the PIMs system. In order to investigate the influence of hydrochloric acid concentration in the source phase on the transport of metal ions, the experiments were performed at HCl concentrations varying from 0.1 to 2.0 mol·dm−3. Separation of Cd(II) and Cu(I) was carried out from the source phase containing 0.01 mol·dm−3 of each metal ion; 1 mol·dm−3 H2SO4 was used as the receiving phase. Figure 4 shows the dependence of the permeability coefficient (P) of the cations transported on the HCl concentration. As can be seen from this figure, the permeability coefficient of Cd(II) increased with HCl concentration in the source phase from 1.88 μm·s−1 at 0.1 mol·dm−3 HCl to 2.53 μm·s−1 at 2 mol·dm−3 HCl. The dependence for the transport of Cu(II) is very similar but the increase of the permeability coefficient values is slightly lower. As can be seen from this figure, the permeability coefficient of Cu(II) increased with HCl concentration, increasing from 0.067 μm·s−1 at 0.1 mol·dm−3 HCl to 0.211 μm·s−1 at 2 mol·dm−3 HCl as the source phase. It appears that an increase in hydrochloric acid concentration is responsible for an increase in the permeability coefficient of Cd(II), likely due to the presence of anionic species, mainly in the source phase. The permeability coefficients calculated for Cd(II) and Cu(II) transport from the source phase of various concentrations of hydrochloric acid confirm that PIM transport depends strongly on the acid and chloride ion concentrations in the source phase.


Application of Phosphonium Ionic Liquids as Ion Carriers in Polymer Inclusion Membranes (PIMs) for Separation of Cadmium(II) and Copper(II) from Aqueous Solutions.

Pospiech B - J Solution Chem (2015)

Effect of HCl concentration in the source phase on the permeability coefficient (P) of Cd(II) and Cu(II) across PIM with Cyphos IL 104. PIM: 0.075 g CTA, 2.7 cm3 ONPOE/1 g CTA, 1.5 mol·dm−3 Cyphos IL 104; the source phase: 0.01 mol·dm−3 Cd(II), 0.01 mol·dm−3 Cu(II) in HCl; the receiving phase: mol·dm−3 H2SO4
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4666278&req=5

Fig4: Effect of HCl concentration in the source phase on the permeability coefficient (P) of Cd(II) and Cu(II) across PIM with Cyphos IL 104. PIM: 0.075 g CTA, 2.7 cm3 ONPOE/1 g CTA, 1.5 mol·dm−3 Cyphos IL 104; the source phase: 0.01 mol·dm−3 Cd(II), 0.01 mol·dm−3 Cu(II) in HCl; the receiving phase: mol·dm−3 H2SO4
Mentions: Cyphos IL 104 was chosen as the selective ion carrier on the basis of the solvent extraction results and the preliminary PIM experiments. The ion carrier was physically immobilized in the polymer matrix containing ONPOE, which was used as the plasticizer as well as solvent for carrier. Hydrochloric acid solutions were used to determine the effect of the acid concentration in the source phase on Cd(II) and Cu(II) transport within the PIMs system. In order to investigate the influence of hydrochloric acid concentration in the source phase on the transport of metal ions, the experiments were performed at HCl concentrations varying from 0.1 to 2.0 mol·dm−3. Separation of Cd(II) and Cu(I) was carried out from the source phase containing 0.01 mol·dm−3 of each metal ion; 1 mol·dm−3 H2SO4 was used as the receiving phase. Figure 4 shows the dependence of the permeability coefficient (P) of the cations transported on the HCl concentration. As can be seen from this figure, the permeability coefficient of Cd(II) increased with HCl concentration in the source phase from 1.88 μm·s−1 at 0.1 mol·dm−3 HCl to 2.53 μm·s−1 at 2 mol·dm−3 HCl. The dependence for the transport of Cu(II) is very similar but the increase of the permeability coefficient values is slightly lower. As can be seen from this figure, the permeability coefficient of Cu(II) increased with HCl concentration, increasing from 0.067 μm·s−1 at 0.1 mol·dm−3 HCl to 0.211 μm·s−1 at 2 mol·dm−3 HCl as the source phase. It appears that an increase in hydrochloric acid concentration is responsible for an increase in the permeability coefficient of Cd(II), likely due to the presence of anionic species, mainly in the source phase. The permeability coefficients calculated for Cd(II) and Cu(II) transport from the source phase of various concentrations of hydrochloric acid confirm that PIM transport depends strongly on the acid and chloride ion concentrations in the source phase.

Bottom Line: It was found that the initial fluxes of Cd(II) and Cu(II) increase with increasing chloride ions concentration in the source phase.The selectivity coefficient for Cd(II) over Cu(II) decreases with increasing HCl concentration in the source phase.The results suggest that the separation system presented in this paper can be useful for the removal of Cd(II) from acidic chloride solutions in the presence of Cu(II).

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, Czestochowa University of Technology, Armii Krajowej 19, 42-200 Czestochowa, Poland.

ABSTRACT

Facilitated transport through polymer inclusion membranes (PIMs) is a promising method for simultaneous separation and removal of valuable and toxic metal ions from aqueous solutions. Recently, ionic liquids (ILs) have been used as extracting agents for metal ions due to their unique physicochemical properties. This paper presents research on the facilitated transport of cadmium(II) and copper(II) ions from aqueous chloride solutions through PIMs with phosphonium ILs as new selective ion carriers. Cellulose triacetate membranes containing o-nitrophenyl octyl ether (ONPOE) as a plasticizer and Cyphos IL 101 [trihexyl(tetradecyl)phosphonium chloride] or Cyphos IL 104 [trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl)phosphinate] as the ion carriers have been prepared and applied for investigations. Cd(II) ions were transported preferably from hydrochloric acid solutions containing Cu(II) ions through the PIMs. Higher selectivity coefficient of Cd(II) over Cu(II) (S Cd/Cu) from 0.1 mol·dm(-3) hydrochloric acid was obtained for PIM with Cyphos IL 104 as the ion carrier. The influence of HCl and NaCl concentrations in the source phase on metal ion transport across PIM doped with Cyphos 104 was studied. It was found that the initial fluxes of Cd(II) and Cu(II) increase with increasing chloride ions concentration in the source phase. The selectivity coefficient for Cd(II) over Cu(II) decreases with increasing HCl concentration in the source phase. The results suggest that the separation system presented in this paper can be useful for the removal of Cd(II) from acidic chloride solutions in the presence of Cu(II).

No MeSH data available.


Related in: MedlinePlus