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Simultaneous selective separation of silver (I) and lead (II) ions from a single dilute source solution through two supported liquid membranes composed of selective crown ethers in supra molecular solvent

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Abstract

In this study, an alternative application of supported liquid membranes (SLMs) containing specific ion carriers dissolved in supra molecular solvent (SUPRA) to the selective and simultaneous separation of Ag+ and Pb2+ ions from a dilute source solution is introduced. A two-membrane three-compartment cell was used. Two micro-porous polypropylene supported membranes loaded with dibenzyl-diaza-18-crown-6 (DBzDA18C6) and dicyclohexyl-18-crown-6 (DC18C6) dissolved in supra molecular solvent (SUPRA) were used for selective transport of silver (I) and lead (II) ions, respectively. At first, vesicles of decanoic acid (SUPRA), as green solvent, were synthesized. Then, each of two mentioned crown ethers was easily dissolved into the SUPRA phase and used as the selective membrane phase for facile and simultaneous transport of lead and silver ions through the designed cell. The DBzDA18C6-loaded membrane was placed between the first and the second compartments (MP1), whereas the DC18C6-loaded membrane was placed between the second and the third ones (MP2) of the transport cell. Using this cell assembly, simultaneous separation and transport of Ag+ and Pb2+ ions are possible from a 1.854 × 10–4 M picric acid source solution containing these two species and several other interfering ions into the two corresponding receiving compartments of the transport cell. The silver (I) and lead (II) ions quantitatively transport during 75 and 15 min of time into two individual receiving solutions, respectively. Sodium thiosulfate (0.6 M at pH 6.4) and sodium pyrophosphate (0.25 M at pH 7) were used as selective stripping agents for Ag+ and Pb2+ ions (RP1 and RP2), respectively.

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Fig. 1

source solution compartment, 500 ml of picrate solution mixture of Ag+ and Pb2+ ions, and other cations; MP: membrane phases, MP1: DBzDaza18C6 in SUPRA (for silver transport) and MP2: DC18C6 in SUPRA (for lead transport); RP: receiving solution compartments, RP1: 100 ml of S2O32− aqueous solution (for silver ions) and RP2: 100 ml of P2O74− aqueous solution (for lead ions); 1: source sampling port; 2 and 3: receiving sampling ports

Fig. 2
Fig. 3

source phase, 500 ml of 2 ppm Ag+ and Pb2+, 1.854 × 10−4 M picric acid at pH = 3.2; MP1, 0.008 M of DBzDA18C6 and MP2, 0.008 M of DC18C6 in SUPRA solvent; RP1, 100 ml of varying concentration of Na2S2O3, (1) 0.6 M, (2) 0.7 M, (3) 0.5 M, at pH = 6.4; RP2, 100 ml of 0.25 M Na4P2O7 at pH = 7. a %Transported into the receiving phase (RP1), b and c % Remaining in the source and membrane phases, respectively

Fig. 4

source phase, 500 ml of 2 ppm Ag+ and Pb2+, 1.854 × 10−4 M picric acid at pH = 3.2; MP1, 0.008 M of DBzDA18C6 and MP2, 0.008 M of DC18C6 in SUPRA solvent; RP1, 100 ml of 0.6 M Na2S2O3 at pH = 6.4; RP2, 100 ml of varying concentration of Na4P2O7, (1) 0.25 M, (2) 0.3 M, (3) 0.17 M, (4) 0.1 M, (5) 0.06 M at pH = 7. a %Transported into the receiving phase (RP2), b and c % Remaining in the source and membrane phases, respectively

Fig. 5

source phase, 500 ml of 2 ppm Ag+ and Pb2+, 1.854 × 10−4 M picric acid at pH = 3.2; MP1, 0.008 M of DBzDA18C6 and MP2, 0.008 M of DC18C6 in SUPRA solvent; RP1, 100 ml of 0.6 M Na2S2O3 at pH = 6.4; RP2, 100 ml of 0.25 M Na4P2O7 at varying pH, (1) 7, (2) 6, (3) 8, (4) 9. a % Transported into the receiving phase; b and c % remaining in the source and membrane phases, respectively

Fig. 6

source phase, 500 ml of 2 ppm Ag+ and Pb2+, varying concentration of picric acid, (1) 1.85 × 10−4 M at pH 3.2, (2) 3.85 × 10−4 M at pH 2.4, (3) 8.85 × 10−5 M at pH 4; MP1, 0.008 M DBzDA18C6 and MP2, 0.008 M DC18C6 in SUPRA solvent; RP1, 100 ml of 0.6 M Na2S2O3 at pH = 6.4; RP2, 100 ml of 0.25 M Na4P2O7 at pH 7. a % Transported into the receiving phase (RP1); b and c % remaining in the source and membrane phases, respectively

Fig. 7

source phase (SP) on Pb2+ transport into RP2 through the SLM. Conditions: source phase, 500 ml of 2 ppm Ag+ and Pb2+, varying concentration of picric acid, (1) 1.85 × 10−4 M at pH 3.2, (2) 3.85 × 10−4 M at pH 2.4, (3) 8.85 × 10−5 M at pH 4; MP1, 0.008 M DBzDA18C6 and MP2, 0.008 M DC18C6 in SUPRA solvent; RP1, 100 ml of 0.6 M Na2S2O3 at pH = 6.4; RP2, 100 ml of 0.25 M Na4P2O7 at pH 7. a % Transported into the receiving phase; b and c % remaining in the source and membrane phases, respectively

Fig. 8

source phase, 500 ml of 2 ppm Ag+ and Pb2+, 1.85 × 10−4 M picric acid at pH = 3.2; MP1, varying concentration of DBzDA18C6, (1) 0.008 M, (2) 0.013 M, (3) 0.005 M, and MP2, 0.008 M DC18C6 in SUPRA solvent; RP1, 100 ml of 0.6 M Na2S2O3 at pH = 6.4; RP2, 100 ml of 0.25 M Na4P2O7 at pH 7. a %Transported into the receiving phase (RP1), b and c %Remaining in the source and membrane phases, respectively

Fig. 9

source phase, 500 ml of 2 ppm Ag+ and Pb2+, 1.85 × 10−4 M picric acid at pH = 3.2; MP1, 0.008 M of DBzDA18C6 and MP2, varying concentration of DC18C6, (1) 0.008 M, (2) 0.013 M, (3) 0.005 M in SUPRA solvent; RP1, 100 ml of 0.6 M Na2S2O3 at pH = 6.4; RP2, 100 ml of 0.25 M Na4P2O7 at pH 7. a % transported into the receiving phase (RP2); b and c % remaining in the source and membrane phases, respectively

Fig. 10

source phase, 500 ml of 2 ppm Ag+ and Pb2+, 1.854 × 10−4 M picric acid at pH = 3.2; MP1, 0.008 M DBzDA18C6 and MP2, 0.008 M DC18C6 in SUPRA solvent; RP1, 100 ml of 0.6 M Na2S2O3 at pH = 6.4; RP2, 100 ml of 0.25 M Na4P2O7 at pH 7. 1 and 4, % transported of Pb2+ and Ag+ into RP2 and RP1, and, 3 and 6, % remaining of Pb2+ and Ag+ in MP2 and MP1, respectively. 2 and 5, % remaining of Pb2+ and Ag+ in SP, respectively

Fig. 11

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Acknowledgements

The support of this work Research Councils of Shahr-e-Qods Branch, Islamic Azad University, and Tehran University and Razi University is gratefully acknowledged. This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Correspondence to Foujan Falaki.

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Falaki, F., Shamsipur, M. & Shemirani, F. Simultaneous selective separation of silver (I) and lead (II) ions from a single dilute source solution through two supported liquid membranes composed of selective crown ethers in supra molecular solvent. Chem. Pap. 75, 5489–5502 (2021). https://doi.org/10.1007/s11696-021-01734-4

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