Macrocycle-Facilitated Transport of Ions in Liquid Membrane Systems

Izatt, Reed M.; Clark, Glen A.; Bradshaw, Jerald S.; Lamb, John D.; Christensen, James J.

doi:10.1080/03602548608068424

Cited by 147 publications

(54 citation statements)

References 75 publications

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“…As expected, it was found that the nature and composition of the ligand used as scavenger for the transported metal ion in the receiving phase could have a significant effect on the efficiency and selectivity of transport. [10][11][12][13][14][15][16][17][18][19][20][28][29][30][31] In Table 2 are listed the percentages of silver ion transported in the presence of different stripping agents under similar experimental conditions. The use of S2O3 2-ion as stripping ligand in the receiving phase caused a large enhancement in the efficiency of Ag + transport, as compared with the case of other receiving agents such as thiourea, EDTA, KSCN and NaI.…”

Section: Resultsmentioning

confidence: 99%

“…However, despite the biological and industrial importance of silver ions, information about its transport across liquid membranes in comparison with other transition metal ions is sparse. [10][11][12][13][14][15][16][17][18][19][20] In this paper, we describe a new selective and efficient liquid membrane system containing potassium-decyl-18-crown-6 for the uphill transport of silver ion as AgBr2 -counter ion. The receiving phase contains the thiosulfate anion, which was found to play an important role in the transport process.…”

Section: Introductionmentioning

confidence: 99%

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Highly Selective and Efficient Membrane Transport of Silver as AgBr-2 Ion Using K+-decyl-18-crown-6 as Carrier

et al. 2003

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Potassium-decyl-18-crown-6 was used as a highly selective and efficient carrier for uphill transport of silver as AgBr2 -complex ion through a chloroform bulk liquid membrane. When thiosulfate anion was used as a metal ion acceptor in the receiving phase the amounts of silver transported across the liquid membrane after 120 and 180 min were 87.0 ± 1.8% and 96.0 ± 1.9%, respectively. The selectivity and efficiency of silver transport from aqueous solution containing Cu 2+ , Zn 2+ , Ni 2+ , Cd 2+ , Pb 2+ and Fe 3+ ions were investigated. In the presence of EDTA at pH = 4 as suitable masking agent in the source phase, the interfering effects of Pb 2+ and Fe 3+ ions were diminished drastically.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Highly Selective and Efficient Membrane Transport of Silver as AgBr-2 Ion Using K+-decyl-18-crown-6 as Carrier

et al. 2003

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“…[10][11][12][13][14][15][32][33][34] It has been shown that this problem can be overcome by appending long chain aliphatic groups to the carrier backbone to increase the lipophilicity of the system. 29,32,33 However, this synthetic procedure is often not straightforward. A simpler alternative is the addition of a long chain fatty acid to the organic phase to decrease the extent of carrier bleeding into the aqueous phases.…”

Section: Resultsmentioning

confidence: 99%

Highly Selective Transport of Ag⁺Ion through a Liquid Membrane Containing 2-Mercaptobenzothiazole as a Carrier

Akhond¹,

Tashkhourian²

2003

Bulletin of the Korean Chemical Society

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2-Mercaptobenzothiazole was used as a highly selective and efficient carrier for the uphill transport of silver ion through a chloroform bulk liquid membrane. In the presence of thiosulfate ion as a suitable metal ion acceptor in the receiving phase, the amount of silver transported across the liquid membrane after 180 min was 90 ± 3.0%. The selectivity and efficiency of silver ion transported from aqueous solutions containing equimolar mixtures of Zn

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“…Macrocycles have been employed for selective separation of metal ions from mixtures in bulk liquid membrane and/ or solvent extraction systems [116,123,124]. However, separation of metal ions using extraction or membrane systems is not considered as a costeffective option due to the gradual loss of the expensive macrocyclic compounds from the organic membrane or layer [125].…”

Section: Operating Route Of Macrocycles In Metal Separationmentioning

confidence: 99%

“…It also provides the advantage of designing a single macrocycle structure with a diverse selectivity option for target elements of distinctive ionic characters [120,121] or a multiple-site receptor for different target species [122] as shown in Fig. 3.Macrocycles have been employed for selective separation of metal ions from mixtures in bulk liquid membrane and/ or solvent extraction systems [116,123,124]. However, separation of metal ions using extraction or membrane systems is not considered as a costeffective option due to the gradual loss of the expensive macrocyclic compounds from the organic membrane or layer [125].…”

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confidence: 99%

Selective separation of elements from complex solution matrix with molecular recognition plus macrocycles attached to a solid-phase: A review

Rahman

Begum

Hasegawa

2013

Microchemical Journal

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Microchemical Journal, 110: 485-493, 2013 The original publication is available at: http://dx.doi. org/10.1016/j.microc.2013.06.006 Abstract Solid-phase extraction (SPE) approach was introduced approximately five decades ago, and until then development of SPE materials is seamlessly continued. Lately, the SPE-based research is increasingly focused in developing more explicit materials to achieve meticulous separation of elements from complex solution matrices with high concentrations of interfering ions. One group of SPE materials includes those with macrocyclic ligands immobilized on a solid-phase, which are capable of selective separation and preconcentration of elements, and such selectivity in metal retention is generally termed as molecular recognition. In the process, the designed 'host' material possesses a high degree of recognition to specific elements or groups of elements called 'guest', and the recognition capability remains effective at the very low concentrations of the 'guest' species or when those present in complex matrices. The routes to the development of element-selective SPEs, the operating principles, applications and limitations are discussed in this review. KeywordsSeparation; element-selectivity; Macrocycles; Solid-phase extraction; Molecular recognition 2 Microchemical Journal, 110: 485-493, 2013 The original publication is available at: http://dx.doi.org/10.1016/j.microc.2013.06.006 IntroductionAlthough metals and metalloids are ubiquitous in nature, the environmental concentrations of both toxic and essential elements have been largely increased mostly pursuant to anthropogenic activities related to the industrial development and improved living standards in modern societies. The growing extent of metal pollution also initiated a number of legislative measures, such as, RoHS or ELV directive has been imposed to specify the limit of trace elements in the industrial products, while the EU directive defined the acceptable concentrations of different elements in cultivable soils.Sensitive analytical techniques such as, flame atomic absorption spectrometry, electrothermal atomic absorption spectrometry, inductively coupled plasma mass spectrometry, inductively coupled plasma optical emission spectrometry, and so forth are available for precise analysis of trace elements in solution. An overall analytical process comprises a number of succeeding steps, including sampling, sample preparation, separation and quantification. Among the aforementioned steps, sample preparation is by far the most important error source in modern analytical method development due to the low species concentration or heterogeneous distribution of the analytes in the matrix as well as the complex nature of the sample matrices. Therefore, a clean-up/separation step is often recommended before the analytical determination of trace elements in effluent or industrial waste waters to avoid the interfering effect from the matrix ions or to facilitate preconcentration due to their low concentrations in samples. The t...

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Macrocycle-Facilitated Transport of Ions in Liquid Membrane Systems

Cited by 147 publications

References 75 publications

Highly Selective and Efficient Membrane Transport of Silver as AgBr-2 Ion Using K+-decyl-18-crown-6 as Carrier

Highly Selective and Efficient Membrane Transport of Silver as AgBr-2 Ion Using K+-decyl-18-crown-6 as Carrier

Highly Selective Transport of Ag⁺Ion through a Liquid Membrane Containing 2-Mercaptobenzothiazole as a Carrier

Selective separation of elements from complex solution matrix with molecular recognition plus macrocycles attached to a solid-phase: A review

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Macrocycle-Facilitated Transport of Ions in Liquid Membrane Systems

Cited by 147 publications

References 75 publications

Highly Selective and Efficient Membrane Transport of Silver as AgBr-2 Ion Using K+-decyl-18-crown-6 as Carrier

Highly Selective and Efficient Membrane Transport of Silver as AgBr-2 Ion Using K+-decyl-18-crown-6 as Carrier

Highly Selective Transport of Ag+Ion through a Liquid Membrane Containing 2-Mercaptobenzothiazole as a Carrier

Selective separation of elements from complex solution matrix with molecular recognition plus macrocycles attached to a solid-phase: A review

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Highly Selective Transport of Ag⁺Ion through a Liquid Membrane Containing 2-Mercaptobenzothiazole as a Carrier