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Membranes
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Advances in MOF-Based Membranes
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Advances in MOF-Based Membranes

A special issue of Membranes (ISSN 2077-0375). This special issue belongs to the section "Inorganic Membranes".

Deadline for manuscript submissions: closed (31 January 2022) | Viewed by 15364

Special Issue Editors

Dr. Sameh Elsaidi

E-Mail Website
Guest Editor
1. DOE National Energy and Technology Laboratory (NETL), Pittsburgh, PA 15236, USA
2. Oak Ridge Institute for Science and Education, Pittsburgh, PA 15236, USA
Interests: inorganic membranes; mixed-matrix membranes; hollow fiber membranes; porous materials; metal-organic frameworks; composites; gas separations; gas storage; carbon capture; nuclear waste management; energy storage, heterogeneous catalysis; radiation-resistant materials; structure-property relationship and materials design
Dr. Mustapha Soukri

E-Mail Website
Co-Guest Editor
Materials Chemistry & Water Technology, Technology Advancement & Commercialization (TAC), RTI International, Research Triangle Park, NC 27709-2194, USA
Interests: porous materials; membranes; MOF-based mixed matrix membranes, gas separations; solid sorbent; catalysis; wastewater treatment; desalination & FO/RO membranes
Dr. Mona H. Mohamed

E-Mail Website
Co-Guest Editor
1. Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA
2 Chemistry Department, Faculty of Science, Alexandria University, P.O. Box 426, Ibrahimia, Alexandria 21321, Egypt
Interests: gas separation; carbon capture technologies; inorganic membranes; mixed-matrix membranes; hollow fiber membranes; porous materials; metal-organic frameworks; composites; gas separations and catalysis

Special Issue Information

Dear Colleagues,

Metal organic frameworks (MOFs) have emerged as a fascinating class of porous crystalline materials assembled by connecting the metal or metal cluster to the organic linker. The high modularity and fine-tunability of these materials in terms pore size, functionality and geometry make them highly versatile and devisable. The ultrahigh surface area and the tunable nanospace of MOFs provide highly suitable accommodation for various guest species. As a result, the idea of processing MOFs in the form of membranes such as inorganic membranes and mixed-matrix membranes is proposed. Several recent experimental and theoretical studies have shown that pure MOF membranes and MOF/polymer composite membranes can outperform well-known organic and inorganic membranes in various applications including: gas separation, pervaporation, nanofiltration, ionic sieving, and catalysis.

This special issue on “Advances in MOF-based membranes” of the journal Membranes seeks contributions to advance the field of pure MOF films and MOF composite membranes through experimental and computational studies. Topics include, but are not limited to, new strategies and techniques for the design, synthesis and processing of MOF-based membranes, fine-tuning of the MOF-polymer interface interactions, techniques for improving MOF adhesion to porous supports, overcoming the selectivity and permeability trade-off, improving the membrane mechanical strength, remarkable membrane performance, novel applications and paving the industrial exploitation of MOF-membranes. Authors are invited to submit their new findings; all research papers and reviews are welcome.

Guest Editor
Dr. Sameh Elsaidi

Co-Guest Editors
Dr. Mustapha Soukri
Dr. Mona H Mohamed

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Membranes is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Inorganic membrane
  • Metal-organic framework films
  • Mixed-matrix membrane
  • Composite membrane
  • Membrane reactors
  • Membrane-based separation
  • Ion transport membrane
  • MOF-polymer interface
  • Membrane-substrate bonding
  • Membrane defects
  • Gas separation
  • Gas sensing
  • Liquid separation
  • Heterogeneous catalysis
  • Water treatment
  • Reverse osmosis
  • Pervaporation
  • Nanofiltration
  • Ion sieving
  • Gas transport mechanism
  • Permeability-selectivity trade-off
  • Aging and plasticization

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Published Papers (3 papers)

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Research

20 pages, 8532 KiB  
Article
Synthesis of ZIF-11 Membranes: The Influence of Preparation Technique and Support Type
by Benjamin Reif, Jan Somboonvong, Martin Hartmann, Malte Kaspereit and Wilhelm Schwieger
Membranes 2021, 11(7), 523; https://doi.org/10.3390/membranes11070523 - 12 Jul 2021
Cited by 3 | Viewed by 4087
Abstract
Due to its structural features, ZIF-11 is one of the most interesting materials for gas separation applications. Herein, we report a systematic study on the synthesis of ZIF-11 as a supported membrane. For this, we adapted optimized conditions for the ZIF-11 powder synthesis, [...] Read more.
Due to its structural features, ZIF-11 is one of the most interesting materials for gas separation applications. Herein, we report a systematic study on the synthesis of ZIF-11 as a supported membrane. For this, we adapted optimized conditions for the ZIF-11 powder synthesis, identified in our previous works, to form ZIF layers on symmetric and asymmetric stainless-steel and asymmetric α-Al2O3 supports. Different techniques were investigated for the challenging layer formation, namely, in situ crystallization (ISC), multiple in situ crystallization (MISC), and the seeding and secondary growth (SSG) method. It was possible to deposit ZIF-11 on different supports by ISC and MISC, although it was difficult to obtain complete layers. SSG, in turn, was more effective in forming dense and well-intergrown ZIF-11 layers. This agrees well with the generally accepted fact that seeding considerably facilitates layer formation. Systematic studies of both individual steps of SSG (seeding and secondary growth) led to a basic understanding of layer formation of ZIF-11 on the different supports. The best membranes prepared by rub seeding and secondary growth achieved Knudsen selectivity. Improved gas separation performance is expected if the formation of defects can be avoided. Full article
(This article belongs to the Special Issue Advances in MOF-Based Membranes)
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13 pages, 3390 KiB  
Article
Carbon Dioxide Enrichment PEBAX/MOF Composite Membrane for CO2 Separation
by Po-Hsiang Tang, Pamela Berilyn So, Wa-Hua Li, Zi-You Hui, Chien-Chieh Hu and Chia-Her Lin
Membranes 2021, 11(6), 404; https://doi.org/10.3390/membranes11060404 - 28 May 2021
Cited by 30 | Viewed by 5582
Abstract
Zeolitic imidazole framework (ZIF-8) was incorporated into poly(ether-block-amide) (Pebax-1657) in differing ratios to prepare mixed matrix membranes (MMMs) for gas separation. As ZIF-8 loading is increased, gas separation selectivity also gradually increases. For economic considerations, the proportion of the increase in selectivity to [...] Read more.
Zeolitic imidazole framework (ZIF-8) was incorporated into poly(ether-block-amide) (Pebax-1657) in differing ratios to prepare mixed matrix membranes (MMMs) for gas separation. As ZIF-8 loading is increased, gas separation selectivity also gradually increases. For economic considerations, the proportion of the increase in selectivity to the amount of MOF loaded per unit was calculated. The results show that mixing 5% MOF gives the best unit performance. With this, a variety of MOFs (UiO-66, UiO-66-NH2, A520, MIL-68(Al) and MIL-100(Fe)) were mixed with PEBAX at 5 loading to prepare MMMs. In this work, metal-organic frameworks (MOFs) were processed using the dry-free method, where in the synthesized MOF was not dried prior to incorporation. The gas separation performance test carried out shows the highest separation performance was exhibited by P-UiO-66, wherein the CO2/N2 gas selectivity was 85.94, and the permeability was 189.77 (Barrer), which was higher than Robeson’s Upper bound in 2008, and obtained a high permeability and selectivity among mixed matrix membranes. In the preparation of high quality MMMs for gas separation, details regarding the interface phenomenon were assessed. Full article
(This article belongs to the Special Issue Advances in MOF-Based Membranes)
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15 pages, 4213 KiB  
Article
Continuous MOF Membrane-Based Sensors via Functionalization of Interdigitated Electrodes
by Susan E. Henkelis, Stephen J. Percival, Leo J. Small, David X. Rademacher and Tina M. Nenoff
Membranes 2021, 11(3), 176; https://doi.org/10.3390/membranes11030176 - 28 Feb 2021
Cited by 21 | Viewed by 4085
Abstract
Three M-MOF-74 (M = Co, Mg, Ni) metal-organic framework (MOF) thin film membranes have been synthesized through a sensor functionalization method for the direct electrical detection of NO2. The two-step surface functionalization procedure on the glass/Pt interdigitated electrodes resulted in a [...] Read more.
Three M-MOF-74 (M = Co, Mg, Ni) metal-organic framework (MOF) thin film membranes have been synthesized through a sensor functionalization method for the direct electrical detection of NO2. The two-step surface functionalization procedure on the glass/Pt interdigitated electrodes resulted in a terminal carboxylate group, with both steps confirmed through infrared spectroscopic analysis. This surface functionalization allowed the MOF materials to grow largely in a uniform manner over the surface of the electrode forming a thin film membrane over the Pt sensing electrodes. The growth of each membrane was confirmed through scanning electron microscopy (SEM) and X-ray diffraction analysis. The Ni and Mg MOFs grew as a continuous but non-defect free membrane with overlapping polycrystallites across the glass surface, whereas the Co-MOF-74 grew discontinuously. To demonstrate the use of these MOF membranes as an NO2 gas sensor, Ni-MOF-74 was chosen as it was consistently fabricated as the best thin and homogenous membrane, as confirmed by SEM. The membrane was exposed to 5 ppm NO2 and the impedance magnitude was observed to decrease 123× in 4 h, with a larger change in impedance and a faster response than the bulk material. Importantly, the use of these membranes as a sensor for NO2 does not require them to be defect-free, but solely continuous and overlapping growth. Full article
(This article belongs to the Special Issue Advances in MOF-Based Membranes)
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