Macrocycle carriers for separation of metal ions in liquid membrane processes—a review

Walkowiak, W.; Kozłowski, Cezary A.

doi:10.1016/j.desal.2007.12.041

Cited by 71 publications

(27 citation statements)

References 56 publications

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“…The number of donor atoms in the crown ether unit determines the stability of the macrocycle-metal complex while the types of donor atoms decide the ion selectivity of the crown ethers [116]. The metal ion binding strength and selectivity can be strengthened by the introduction of one or more side arms into the crown ether unit, and the derivative is known as lariat ether [113,117,118].…”

Section: Operating Route Of Macrocycles In Metal Separationmentioning

confidence: 99%

“…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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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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Section: Operating Route Of Macrocycles In Metal Separationmentioning

confidence: 99%

Section: Operating Route Of Macrocycles In Metal Separationmentioning

confidence: 99%

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confidence: 99%

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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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“…cyclodextrins), and macromolecular compounds, i.e. acyclic polyethers, have been widely used as ion carriers in transport across various supported liquid membranes technologies for metal ions selective removal from different aqueous solutions [124] . The transport selective orders for the PIMs with calyx [4] resorcinarenes derivatives was found to be Pb(II)>Cd(II)>Zn(II) [125] .…”

Section: Some Applicationsmentioning

confidence: 99%

Supported liquid membranes technologies in metals removal from liquid effluents

Agreda¹,

García‐Díaz²,

López³

et al. 2011

REVMETAL

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The generation of liquid effluents containing organic and inorganic residues from industries present a potential hazardousness for environment and human health, being mandatory the elimination of these pollutants from the respective solutions containing them. In order to achieve this goal, several techniques are being used and among them, supported liquid membranes technologies are showing their potential for their application in the removal of metals contained in liquid effluents. Supported liquid membranes are a combination between conventional polymeric membranes and solvent extraction. Several configurations are used: flat-sheet supported liquid membranes, spiral wounds and hollow fiber modules. In order to improve their effectiveness, smart operations have been developed: non-dispersive solvent extraction, non-dispersive solvent extraction with strip phase dispersion and hollow fiber renewal liquid membrane. This paper overviewed some of these supported liquid membranes technologies and their applications to the treatment of metal-bearing liquid effluents. KeywordsSupported liquid membranes; Metals; Extractants; Ionic liquids; liquid effluents; Environment. Tecnologías de membranas líquidas soportadas en la eliminación de metales de efluentes líquidos ResumenLa generación, por parte de las industrias, de efluentes líquidos conteniendo sustancias orgánicas e inorgánicas, es un peligro potencial tanto para los humanos como para el medio ambiente, siendo necesaria la eliminación de estos elementos tóxicos de las disoluciones que los contienen. Para conseguir este fin, se están aplicando diversas técni-cas y entre ellas las tecnologías de membranas líquidas soportadas, están demostrando sus aptitudes para la eliminación de metales contenidos en efluentes líquidos. Las membranas líquidas soportadas, resultan de la unión de las membranas poliméricas y de la tecnología de extracción líquido-líquido. Este tipo de membranas se pueden utilizar en diversas configuraciones: plana, módulo en fibra hueca y módulo en espiral y para aumentar su efectividad se están desarrollando las llamadas operaciones avanzadas: extracción no dispersiva, extracción no dispersiva con dispersión de la fase de reextracción y empleo del módulo de fibra hueca, con renovación de la membrana líquida. En este trabajo se revisan estas operaciones de membranas líquidas soportadas y algunas de las aplicaciones de las mismas, en el tratamiento de efluentes líquidos conteniendo metales. Palabras claveMembranas líquidas soportadas; Metales; Agentes de extracción; Líquidos iónicos; Efluentes líquidos; Medio ambiente.

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“…The selectivity behavior of the macrocycle can be modified by varying any of those factors (Tsukube 1993, Mahoney et al 2001, Nabeshima et al 2005. Macrocycles have been employed for the selective separation of metal ions from mixtures in bulk liquid membrane and/or solvent extraction systems (Izatt et al 1986, Walkowiak et al 2002, Walkowiak & Kozlowski 2009). However, separation of metal ions using extraction or membrane systems is not considered as a costWater, Air, & Soil Pollution, 224(5): 1526.…”

Section: Introductionmentioning

confidence: 99%

Selective Separation of Tri- and Pentavalent Arsenic in Aqueous Matrix with a Macrocycle-Immobilized Solid-Phase Extraction System

Rahman

Begum

Furusho³

et al. 2013

Water Air Soil Pollut

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Macrocycle carriers for separation of metal ions in liquid membrane processes—a review

Cited by 71 publications

References 56 publications

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

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

Supported liquid membranes technologies in metals removal from liquid effluents

Selective Separation of Tri- and Pentavalent Arsenic in Aqueous Matrix with a Macrocycle-Immobilized Solid-Phase Extraction System

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