Coordination Cages Selectively Transport Molecular Cargoes Across Liquid Membranes

Chemical purifications are critical processes across many industries, requiring 10 - 15% of humanity’s global energy budget1,2. Coordination cages are able to catch and release guest molecules based upon their size and shape3,4, providing a new technological basis for achieving chemical separation. Here we show that aqueous solutions of FeII4L6 and CoII4L4 cages can be used as liquid membranes. Selective transport of complex hydrocarbons across these membranes enabled the separation of target compounds from mixtures under ambient conditions. The kinetics of cage-mediated cargo transport are governed by guest binding affinity. Using sequential transport across two consecutive membranes, target compounds were isolated from a mixture in a size-selective fashion. The selectivities of both cages thus enabled a two-stage separation process to isolate a single compound from a mixture of physicochemically similar molecules.

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Coordination Cages Transport Molecular Cargoes Across Liquid Membranes

10.26434/chemrxiv.14208248 ◽

2021 ◽

Author(s):

Bao-Nguyen Nguyen ◽

John D. Thoburn ◽

Angela Grommet ◽

Duncan Howe ◽

Tanya K. Ronson ◽

...

Keyword(s):

Chemical Separation ◽

Liquid Membranes ◽

Ambient Conditions ◽

Guest Molecules ◽

Technological Basis ◽

Catch And Release ◽

Stage Separation ◽

Guest Binding ◽

Coordination Cages ◽

Single Compound

Chemical purifications are critical processes across many industries, requiring 10 - 15% of humanity’s global energy budget1,2. Coordination cages are able to catch and release guest molecules based upon their size and shape3,4, providing a new technological basis for achieving chemical separation. Here we show that aqueous solutions of FeII4L6 and CoII4L4 cages can be used as liquid membranes. Selective transport of complex hydrocarbons across these membranes enabled the separation of target compounds from mixtures under ambient conditions. The kinetics of cage-mediated cargo transport are governed by guest binding affinity. Using sequential transport across two consecutive membranes, target compounds were isolated from a mixture in a size-selective fashion. The selectivities of both cages thus enabled a two-stage separation process to isolate a single compound from a mixture of physicochemically similar molecules.

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Use of D2EHPA-mediated liquid membranes for heavy metal ions separation: A review

Revue Roumaine de Chimie ◽

10.33224/rrch/2019.64.2.01 ◽

2019 ◽

Vol 64 (2) ◽

pp. 113-124

Author(s):

Zaher ALBARAKA ◽

Keyword(s):

Heavy Metal ◽

Metal Ions ◽

Heavy Metal Ions ◽

Liquid Membranes

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Synthesis of Calcium Carbonate Micro Particles using Emulsion Membrane Process Applied for Drug Release Studies

Revista de Chimie ◽

10.37358/rc.17.10.5877 ◽

2017 ◽

Vol 68 (10) ◽

pp. 2320-2324

Author(s):

Mariana Mateescu ◽

Sanda Maria Doncea ◽

Irina Chican ◽

Cristina Lavinia Nistor ◽

Ioneta Codrina Bujanca

Keyword(s):

Light Scattering ◽

Calcium Carbonate ◽

Dynamic Light Scattering ◽

Liquid Membranes ◽

Membrane Process ◽

Emulsion Method ◽

Micro Particles ◽

Release Studies ◽

Emulsion Liquid Membranes ◽

Span 80

The aim of this work is the synthesis of calcium carbonate (CaCO3) nano and microparticles and their application as biomaterials (vehicles) for the sustained release of doxycycline. CaCO3 micro particles were synthesized by water-in oil (W/O) emulsion method using emulsion liquid membranes with bis (2-ethylhexyl) phosphate (D2EHPA) as carrier, Span 80 as surfactant, and toluene and kerosene as organic solvents. The aqueous phases contained 1 M CaCl2, and 1 M Na2CO3, respectively. The Dynamic Light Scattering (DLS) data showed CaCO3 particles with sizes ranging from around 100 nm to 3500 nm. The CaCO3 particles with the average diameters around 600 nm attained an adsorbtion of doxycycline of maximum 97.9%, and a slow and steady release with a cumulative value of approximative 50% after ten days.

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Selective permeation of 90Y from a mixture of 90Y/90Sr through diglycolamide impregnated supported liquid membranes

Applied Radiation and Isotopes ◽

10.1016/j.apradiso.2021.109604 ◽

2021 ◽

Vol 170 ◽

pp. 109604

Author(s):

Rohit Kumar ◽

S.A. Ansari ◽

Pankaj Kandwal ◽

P.K. Mohapatra

Keyword(s):

Liquid Membranes ◽

Supported Liquid Membranes

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Investigating the Proton and Ion Transfer Properties of Supported Ionic Liquid Membranes Prepared for Bioelectrochemical Applications Using Hydrophobic Imidazolium-Type Ionic Liquids

Membranes ◽

10.3390/membranes11050359 ◽

2021 ◽

Vol 11 (5) ◽

pp. 359

Author(s):

László Koók ◽

Piroska Lajtai-Szabó ◽

Péter Bakonyi ◽

Katalin Bélafi-Bakó ◽

Nándor Nemestóthy

Keyword(s):

Mass Transfer ◽

Ionic Liquid ◽

Ionic Liquids ◽

Microbial Fuel Cells ◽

Transport Numbers ◽

Liquid Membranes ◽

Ion Transfer ◽

Supported Ionic Liquid ◽

Supported Ionic Liquid Membranes ◽

Transfer Properties

Hydrophobic ionic liquids (IL) may offer a special electrolyte in the form of supported ionic liquid membranes (SILM) for microbial fuel cells (MFC) due to their advantageous mass transfer characteristics. In this work, the proton and ion transfer properties of SILMs made with IL containing imidazolium cation and [PF6]− and [NTf2]− anions were studied and compared to Nafion. It resulted that both ILs show better proton mass transfer and diffusion coefficient than Nafion. The data implied the presence of water microclusters permeating through [hmim][PF6]-SILM to assist the proton transfer. This mechanism could not be assumed in the case of [NTf2]− containing IL. Ion transport numbers of K+, Na+, and H+ showed that the IL with [PF6]− anion could be beneficial in terms of reducing ion transfer losses in MFCs. Moreover, the conductivity of [bmim][PF6]-SILM at low electrolyte concentration (such as in MFCs) was comparable to Nafion.

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