1
|
Tejedor I, Andrés MA, Carné-Sánchez A, Arjona M, Pérez-Miana M, Sánchez-Laínez J, Coronas J, Fontaine P, Goldmann M, Roubeau O, Maspoch D, Gascón I. Influence of the Surface Chemistry of Metal-Organic Polyhedra in Their Assembly into Ultrathin Films for Gas Separation. ACS APPLIED MATERIALS & INTERFACES 2022; 14:27495-27506. [PMID: 35657142 PMCID: PMC9204701 DOI: 10.1021/acsami.2c06123] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Accepted: 05/24/2022] [Indexed: 06/15/2023]
Abstract
The formation of ultrathin films of Rh-based porous metal-organic polyhedra (Rh-MOPs) by the Langmuir-Blodgett method has been explored. Homogeneous and dense monolayer films were formed at the air-water interface either using two different coordinatively alkyl-functionalized Rh-MOPs (HRhMOP(diz)12 and HRhMOP(oiz)12) or by in situ incorporation of aliphatic chains to the axial sites of dirhodium paddlewheels of another Rh-MOP (OHRhMOP) at the air-liquid interface. All these Rh-MOP monolayers were successively deposited onto different substrates in order to obtain multilayer films with controllable thicknesses. Aliphatic chains were partially removed from HRhMOP(diz)12 films post-synthetically by a simple acid treatment, resulting in a relevant modification of the film hydrophobicity. Moreover, the CO2/N2 separation performance of Rh-MOP-supported membranes was also evaluated, proving that they can be used as selective layers for efficient CO2 separation.
Collapse
Affiliation(s)
- Inés Tejedor
- Instituto
de Nanociencia y Materiales de Aragón (INMA), CSIC and Universidad de Zaragoza, Zaragoza 50009, Spain
- Departamento
de Química Física, Universidad
de Zaragoza, Zaragoza 50009, Spain
| | - Miguel A. Andrés
- Instituto
de Nanociencia y Materiales de Aragón (INMA), CSIC and Universidad de Zaragoza, Zaragoza 50009, Spain
- Departamento
de Química Física, Universidad
de Zaragoza, Zaragoza 50009, Spain
| | - Arnau Carné-Sánchez
- Catalan
Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, Barcelona 08193, Spain
| | - Mónica Arjona
- Departamento
de Química Física, Universidad
de Zaragoza, Zaragoza 50009, Spain
| | - Marta Pérez-Miana
- Instituto
de Nanociencia y Materiales de Aragón (INMA), CSIC and Universidad de Zaragoza, Zaragoza 50009, Spain
- Chemical
and Environmental Engineering Department, Universidad de Zaragoza, Zaragoza 50018, Spain
| | - Javier Sánchez-Laínez
- Instituto
de Nanociencia y Materiales de Aragón (INMA), CSIC and Universidad de Zaragoza, Zaragoza 50009, Spain
- Chemical
and Environmental Engineering Department, Universidad de Zaragoza, Zaragoza 50018, Spain
| | - Joaquín Coronas
- Instituto
de Nanociencia y Materiales de Aragón (INMA), CSIC and Universidad de Zaragoza, Zaragoza 50009, Spain
- Chemical
and Environmental Engineering Department, Universidad de Zaragoza, Zaragoza 50018, Spain
| | - Philippe Fontaine
- Synchrotron
SOLEIL, L’Orme des Merisiers, Saint-Aubin, BP 48, Gif-sur-Yvette 91192, France
| | - Michel Goldmann
- Synchrotron
SOLEIL, L’Orme des Merisiers, Saint-Aubin, BP 48, Gif-sur-Yvette 91192, France
- Institut
des NanoSciences de Paris, UMR 7588 CNRS, Sorbonne Université, 4 Place Jussieu, Paris Cedex 05 75252, France
| | - Olivier Roubeau
- Instituto
de Nanociencia y Materiales de Aragón (INMA), CSIC and Universidad de Zaragoza, Zaragoza 50009, Spain
| | - Daniel Maspoch
- Catalan
Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, Barcelona 08193, Spain
| | - Ignacio Gascón
- Instituto
de Nanociencia y Materiales de Aragón (INMA), CSIC and Universidad de Zaragoza, Zaragoza 50009, Spain
- Departamento
de Química Física, Universidad
de Zaragoza, Zaragoza 50009, Spain
| |
Collapse
|
2
|
Wang Y, Ghanem BS, Han Y, Pinnau I. State-of-the-art polymers of intrinsic microporosity for high-performance gas separation membranes. Curr Opin Chem Eng 2022. [DOI: 10.1016/j.coche.2021.100755] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
3
|
Lee J, Park CY, Kong CI, Lee JH, Moon SY. Ultrathin Water-Cast Polymer Membranes for Hydrogen Purification. ACS APPLIED MATERIALS & INTERFACES 2022; 14:7292-7300. [PMID: 35084818 DOI: 10.1021/acsami.1c21780] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Among various H2 purification technologies, the use of membrane technology has been considered an ecofriendly approach for addressing the increasing hydrogen demand. Although many H2-selective membrane materials have been reported, processing them into hollow fibers or thin-film composites (TFCs) via traditional methods either affects the performance of the materials or renders their further processing into applicable membrane forms infeasible. Herein, we propose a water-casting method for fabricating TFC membranes for hydrogen purification with high permselectivity. The film integrity and thickness were manipulated by controlling the spreadability of the casting solution, and the resultant water-cast TFC membrane that comprised an ∼30 nm selective layer demonstrated high H2 permeance and H2/CH4 selectivity of approximately 190 GPU and 100, respectively, under optimized conditions. We performed a mixed-gas permeation test using a simulated off-gas of steam-methane reforming from natural gas in a single-stage system and obtained hydrogen gas of >99 mol % purity. This indicates not only the suitability of the water-cast membranes for satisfying the demand for pure hydrogen as a fuel and chemical reagent but also the great potential of the water-casting method for high-performance membranes in various industrial and environmental applications.
Collapse
Affiliation(s)
- Jongmyeong Lee
- C1 Gas & Carbon Convergent Research Center, Korea Research Institute of Chemical Technology, Daejeon 34114, Korea
| | - Chae-Young Park
- R&D Center for Advanced Pharmaceuticals & Evaluation, Korea Institute of Toxicology, Daejeon 34114, Korea
| | - Chang-In Kong
- C1 Gas & Carbon Convergent Research Center, Korea Research Institute of Chemical Technology, Daejeon 34114, Korea
| | - Jae-Hyeok Lee
- R&D Center for Advanced Pharmaceuticals & Evaluation, Korea Institute of Toxicology, Daejeon 34114, Korea
| | - Su-Young Moon
- C1 Gas & Carbon Convergent Research Center, Korea Research Institute of Chemical Technology, Daejeon 34114, Korea
| |
Collapse
|
4
|
Stanovský P, Benkocká M, Kolská Z, Šimčík M, Slepička P, Švorčík V, Friess K, Ruzicka MC, Izak P. Permeability enhancement of chemically modified and grafted polyamide layer of thin-film composite membranes for biogas upgrading. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2021.119890] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
5
|
Wong KC, Goh PS, Suzaimi ND, Ng ZC, Ismail AF, Jiang X, Hu X, Taniguchi T. Tailoring the CO 2-selectivity of interfacial polymerized thin film nanocomposite membrane via the barrier effect of functionalized boron nitride. J Colloid Interface Sci 2021; 603:810-821. [PMID: 34237599 DOI: 10.1016/j.jcis.2021.06.156] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 06/22/2021] [Accepted: 06/27/2021] [Indexed: 11/18/2022]
Abstract
Membrane-based separation is an appealing solution to mitigate CO2 emission sustainably due to its energy efficiency and environmental friendliness. Attributed to its excellent separation endowed by nanomaterial incorporation, nanocomposite membrane is rigorously developed. This study explored the feasibility of boron nitride (BN) embedment and changes to formation mechanism of ultrathin selective layer of thin film nanocomposite (TFN) are investigated. The effects of amine-functionalization on nanosheet-polymer interaction and CO2 separation performance are also identified. Participation of nanosheets during interfacial polymerization reduced the crosslinking of selective layer, hence, improved TFN permeance while the formation of contorted diffusion paths by the nanosheets favors transport of small gases. Amine-functionalization enhanced the nanosheet-polymer interaction and elevated the membrane affinity towards CO2 which led to enhanced CO2 selectivity. The best TFN prepared in this study exhibited 37% and 20% increment in permeability and selectivity, respectively with respect to neat thin film composite (TFC). It is found that the CO2 separation performance of BN incorporated TFN is on par with many non-porous nanosheet-incorporated TFNs reported in literatures. The transport and barrier effects of BN and functionalized BN are discussed in detail to provide further insights into the development of commercially attractive CO2 selective TFN membranes.
Collapse
Affiliation(s)
- Kar Chun Wong
- Advanced Membrane Technology Research Centre (AMTEC), School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Johor, Malaysia
| | - Pei Sean Goh
- Advanced Membrane Technology Research Centre (AMTEC), School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Johor, Malaysia.
| | - Nur Diyana Suzaimi
- Advanced Membrane Technology Research Centre (AMTEC), School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Johor, Malaysia
| | - Zhi Chien Ng
- Advanced Membrane Technology Research Centre (AMTEC), School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Johor, Malaysia
| | - Ahmad Fauzi Ismail
- Advanced Membrane Technology Research Centre (AMTEC), School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Johor, Malaysia
| | - Xiaoxia Jiang
- School of Mechanical Engineering, Ningxia University, 750021 Ningxia, Yinchuan, China; State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China
| | - Xiude Hu
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China
| | - Takaaki Taniguchi
- World Premier International Center of Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| |
Collapse
|
6
|
Upgrading of raw biogas using membranes based on the ultrapermeable polymer of intrinsic microporosity PIM-TMN-Trip. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2020.118694] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
7
|
Stanovsky P, Zitkova A, Karaszova M, Šyc M, Jansen JC, Comesaña Gándara B, McKeown N, Izak P. Flue gas purification with membranes based on the polymer of intrinsic microporosity PIM-TMN-Trip. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.116814] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
8
|
Castro-Muñoz R, Agrawal KV, Coronas J. Ultrathin permselective membranes: the latent way for efficient gas separation. RSC Adv 2020; 10:12653-12670. [PMID: 35497580 PMCID: PMC9051376 DOI: 10.1039/d0ra02254c] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Accepted: 03/11/2020] [Indexed: 12/18/2022] Open
Abstract
Membrane gas separation has attracted the attention of chemical engineers for the selective separation of gases. Among the different types of membranes used, ultrathin membranes are recognized to break the trade-off between selectivity and permeance to provide ultimate separation. Such success has been associated with the ultrathin nature of the selective layer as well as their defect-free structure. These membrane features can be obtained from specific membrane preparation procedures used, in which the intrinsic properties of different nanostructured materials (e.g., polymers, zeolites, covalent-organic frameworks, metal-organic frameworks, and graphene and its derivatives) also play a crucial role. It is likely that such a concept of membranes will be explored in the coming years. Therefore, the goal of this review study is to give the latest insights into the use of ultrathin selective barriers, highlighting and describing the primary membrane preparation protocols applied, such as atomic layer deposition, in situ crystal formation, interfacial polymerization, Langmuir-Blodgett technique, facile filtration process, and gutter layer formation, to mention just a few. For this, the most recent approaches are addressed, with particular emphasis on the most relevant results in separating gas molecules. A brief overview of the fundamentals for the application of the techniques is given. Finally, by reviewing the ongoing development works, the concluding remarks and future trends are also provided.
Collapse
Affiliation(s)
- Roberto Castro-Muñoz
- Tecnologico de Monterrey, Campus Toluca Avenida Eduardo Monroy Cárdenas 2000 San Antonio Buenavista 50110 Toluca de Lerdo Mexico
| | - Kumar Varoon Agrawal
- Institute of Chemical Sciences and Engineering (ISIC), École Polytechnique Fédérale de Lausanne Sion Switzerland
| | - Joaquín Coronas
- Chemical and Environmental Engineering Department, Instituto de Nanociencia de Aragón (INA), Instituto de Ciencia de Materiales de Aragón (ICMA), Universidad de Zaragoza-CSIC 50018 Zaragoza Spain
| |
Collapse
|
9
|
Andrés MA, Carné-Sánchez A, Sánchez-Laínez J, Roubeau O, Coronas J, Maspoch D, Gascón I. Ultrathin Films of Porous Metal-Organic Polyhedra for Gas Separation. Chemistry 2020; 26:143-147. [PMID: 31692089 DOI: 10.1002/chem.201904141] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Indexed: 12/21/2022]
Abstract
Ultrathin films of a robust RhII -based porous metal-organic polyhedra (MOP) have been obtained. Homogeneous and compact monolayer films (ca. 2.5 nm thick) were first formed at the air-water interface, deposited onto different substrates and characterized using spectroscopic methods, scanning transmission electron microscopy and atomic force microscopy. As a proof of concept, the gas separation performance of MOP-supported membranes has also been evaluated. Selective MOP ultrathin films (thickness ca. 60 nm) exhibit remarkable CO2 permeance and CO2 /N2 selectivity, demonstrating the great combined potential of MOP and Langmuir-based techniques in separation technologies.
Collapse
Affiliation(s)
- Miguel A Andrés
- Departamento de Química Física and Instituto de Nanociencia de, Aragón (INA), Universidad de Zaragoza, 50009, Zaragoza, Spain.,Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC, Universidad de Zaragoza, 50009, Zaragoza, Spain
| | - Arnau Carné-Sánchez
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC, The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193, Barcelona, Spain
| | - Javier Sánchez-Laínez
- Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC, Universidad de Zaragoza, 50009, Zaragoza, Spain.,Chemical and Environmental Engineering Department and Instituto de, Nanociencia de Aragón (INA), Universidad de Zaragoza, 50018, Zaragoza, Spain
| | - Olivier Roubeau
- Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC, Universidad de Zaragoza, 50009, Zaragoza, Spain
| | - Joaquín Coronas
- Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC, Universidad de Zaragoza, 50009, Zaragoza, Spain.,Chemical and Environmental Engineering Department and Instituto de, Nanociencia de Aragón (INA), Universidad de Zaragoza, 50018, Zaragoza, Spain
| | - Daniel Maspoch
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC, The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193, Barcelona, Spain.,ICREA, Pg. Lluís Companys 23, 08010, Barcelona, Spain
| | - Ignacio Gascón
- Departamento de Química Física and Instituto de Nanociencia de, Aragón (INA), Universidad de Zaragoza, 50009, Zaragoza, Spain.,Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC, Universidad de Zaragoza, 50009, Zaragoza, Spain
| |
Collapse
|
10
|
Chimisso V, Maffeis V, Hürlimann D, Palivan CG, Meier W. Self-Assembled Polymeric Membranes and Nanoassemblies on Surfaces: Preparation, Characterization, and Current Applications. Macromol Biosci 2019; 20:e1900257. [PMID: 31549783 DOI: 10.1002/mabi.201900257] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 08/30/2019] [Indexed: 01/11/2023]
Abstract
Biomembranes play a crucial role in a multitude of biological processes, where high selectivity and efficiency are key points in the reaction course. The outstanding performance of biological membranes is based on the coupling between the membrane and biomolecules, such as membrane proteins. Polymer-based membranes and assemblies represent a great alternative to lipid ones, as their presence not only dramatically increases the mechanical stability of such systems, but also opens the scope to a broad range of chemical functionalities, which can be fine-tuned to selectively combine with a specific biomolecule. Tethering the membranes or nanoassemblies on a solid support opens the way to a class of functional surfaces finding application as sensors, biocomputing systems, molecular recognition, and filtration membranes. Herein, the design, physical assembly, and biomolecule attachment/insertion on/within solid-supported polymeric membranes and nanoassemblies are presented in detail with relevant examples. Furthermore, the models and applications for these materials are highlighted with the recent advances in each field.
Collapse
Affiliation(s)
- Vittoria Chimisso
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4056, Basel, Switzerland
| | - Viviana Maffeis
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4056, Basel, Switzerland
| | - Dimitri Hürlimann
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4056, Basel, Switzerland
| | - Cornelia G Palivan
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4056, Basel, Switzerland
| | - Wolfgang Meier
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4056, Basel, Switzerland
| |
Collapse
|
11
|
Liu Y, Sakurai K. Thickness Changes in Temperature-Responsive Poly( N-isopropylacrylamide) Ultrathin Films under Ambient Conditions. ACS OMEGA 2019; 4:12194-12203. [PMID: 31460334 PMCID: PMC6681975 DOI: 10.1021/acsomega.9b01350] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Accepted: 07/01/2019] [Indexed: 06/10/2023]
Abstract
In this paper, we report detailed experimental observations of unusual changes in the thickness of solid poly(N-isopropylacrylamide) (PNIPAM) ultrathin films, which are well known to have temperature-responsive hydrophilic-hydrophobic switching properties. To date, a number of studies have been carried out on the bulk and the brush forms of PNIPAM in contact with liquid water, as well as in highly humid environments, and, recently, these ultrathin films have been preliminarily shown to exhibit temperature responses even under low-humidity, ambient conditions. In this work, the thicknesses of ultrathin PNIPAM films in a temperature/moisture-controlled sample stage were monitored continuously using multichannel X-ray reflectometry. At room temperature, the sample thickness showed an unexpected increase after thermal treatment at 70 °C for 3 h. In the temperature cycle between 15 and 60 °C, heating and cooling resulted in some clear differences. During cooling, initially, the thickness was almost constant but began to increase when the temperature exceeded 33 °C, which corresponds to the lower critical solution temperature (LCST). This observation indicates that the PNIPAM ultrathin film is sensitive to the small amounts of water contained in the air, even under ambient, low-humidity conditions. On the other hand, during heating run from 15 to 60 °C, the humidity dependence was monotonic, and no specific changes in the PNIPAM films were observed at around the LCST. By studying the humidity dependence, we found that the hydrophilic and hydrophobic states of the PNIPAM ultrathin film exhibit different temperature dependence behaviors. In addition, we found that swelling takes place even under low-moisture conditions. To understand the difference in the thickness changes observed on cooling and heating further, some models considering the effect of the boundary conditions in the polymer ultrathin film system were considered. In the case of the ultrathin film, the hydrophilic/hydrophobic switching property occurred only in the surface layer, which dominated the absorption of water molecules from air. In contrast, the interface layer was time-stable and provided an escape route for water molecules during heating.
Collapse
Affiliation(s)
- Yuwei Liu
- University
of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-0006, Japan
- National
Institute for Materials Science, 1-2-1, Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Kenji Sakurai
- University
of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-0006, Japan
- National
Institute for Materials Science, 1-2-1, Sengen, Tsukuba, Ibaraki 305-0047, Japan
| |
Collapse
|
12
|
Esposito E, Mazzei I, Monteleone M, Fuoco A, Carta M, McKeown NB, Malpass-Evans R, Jansen JC. Highly Permeable Matrimid ®/PIM-EA(H₂)-TB Blend Membrane for Gas Separation. Polymers (Basel) 2018; 11:E46. [PMID: 30960029 PMCID: PMC6401697 DOI: 10.3390/polym11010046] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 12/21/2018] [Accepted: 12/25/2018] [Indexed: 11/17/2022] Open
Abstract
The effect on the gas transport properties of Matrimid®5218 of blending with the polymer of intrinsic microporosity PIM-EA(H₂)-TB was studied by pure and mixed gas permeation measurements. Membranes of the two neat polymers and their 50/50 wt % blend were prepared by solution casting from a dilute solution in dichloromethane. The pure gas permeability and diffusion coefficients of H₂, He, O₂, N₂, CO₂ and CH₄ were determined by the time lag method in a traditional fixed volume gas permeation setup. Mixed gas permeability measurements with a 35/65 vol % CO₂/CH₄ mixture and a 15/85 vol % CO₂/N₂ mixture were performed on a novel variable volume setup with on-line mass spectrometric analysis of the permeate composition, with the unique feature that it is also able to determine the mixed gas diffusion coefficients. It was found that the permeability of Matrimid increased approximately 20-fold with the addition of 50 wt % PIM-EA(H₂)-TB. Mixed gas permeation measurements showed a slightly stronger pressure dependence for selectivity of separation of the CO₂/CH₄ mixture as compared to the CO₂/N₂ mixture, particularly for both the blended membrane and the pure PIM. The mixed gas selectivity was slightly higher than for pure gases, and although N₂ and CH₄ diffusion coefficients strongly increase in the presence of CO₂, their solubility is dramatically reduced as a result of competitive sorption. A full analysis is provided of the difference between the pure and mixed gas transport parameters of PIM-EA(H₂)-TB, Matrimid®5218 and their 50:50 wt % blend, including unique mixed gas diffusion coefficients.
Collapse
Affiliation(s)
- Elisa Esposito
- Institute on Membrane Technology, ITM-CNR, Via P. Bucci 17/C, 87036 Rende (CS), Italy.
| | - Irene Mazzei
- Department of Chemistry, Durham University, Stockton Road, Durham DH1 3LE, UK.
| | - Marcello Monteleone
- Institute on Membrane Technology, ITM-CNR, Via P. Bucci 17/C, 87036 Rende (CS), Italy.
| | - Alessio Fuoco
- Institute on Membrane Technology, ITM-CNR, Via P. Bucci 17/C, 87036 Rende (CS), Italy.
| | - Mariolino Carta
- Department of Chemistry, College of Science, Swansea University, Grove Building, Singleton Park, Swansea SA2 8PP, UK.
| | - Neil B McKeown
- EastChem, School of Chemistry, University of Edinburgh, David Brewster Road, Edinburgh EH9 3FJ, UK.
| | - Richard Malpass-Evans
- EastChem, School of Chemistry, University of Edinburgh, David Brewster Road, Edinburgh EH9 3FJ, UK.
| | - Johannes C Jansen
- Institute on Membrane Technology, ITM-CNR, Via P. Bucci 17/C, 87036 Rende (CS), Italy.
| |
Collapse
|