Double-Layered Pebax® 3533/ZIF-8 Membranes with Single-Walled Carbon Nanotube Buckypapers as Support for Gas Separation

Berned‐Samatán, Víctor; Téllez, Carlos; Coronas, Joaquı́n

doi:10.3390/membranes13010071

Cited by 9 publications

(3 citation statements)

References 43 publications

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“…All these specifics make ZIFs special MOFs [ 5 ]. They are being intensively investigated in applications such as energy storage [ 6 ], electrocatalysis [ 7 ], heterogeneous catalysis [ 8 ], drug delivery [ 9 ], enzyme support [ 10 ], environmental remediation [ 11 ] or gas separation [ 12 ], among others. Nevertheless, another key factor of such widespread use of ZIFs is their synthesis under benign conditions, at room temperature and with water as the solvent.…”

Section: Introductionmentioning

confidence: 99%

Sustainable Synthesis of Zeolitic Imidazolate Frameworks at Room Temperature in Water with Exact Zn/Linker Stoichiometry

Molina,

Rodríguez-Campa,

Flores-Borrell

et al. 2024

Nanomaterials

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Zeolitic imidazolate frameworks (ZIFs) are widely used MOFs because of certain characteristics, but also because they can be prepared at room temperature using water as the unique solvent. However, these a priori sustainable conditions inevitably entail a huge and somehow unusable excess of linker. Here, we present the formation of ZIFs at room temperature in water, starting from mixtures with a linker/metal ratio of two, that is, coinciding with the stoichiometry found in the final MOFs, in the presence of amines. ZIF-8 can be prepared with triethylamine (TEA), giving a yield of Zn of 96.6%. Other bases, like NaOH, tetraethylammonium hydroxide or ammonium hydroxide, do not lead to ZIF-8 under the same conditions. The so-obtained ZIF-8 contains TEA inside its cavities, making it less porous than its conventionally prepared counterparts. Amine can be removed by mild thermal treatments (200–250 °C). Such thermal treatments induce the generation of g-C3N4-like species which could give added value to these materials as potential photocatalysts, increasing their affinity to CO2, as proved in this work. This methodology can be successfully extended to other amines, like N,N-dicyclohexylmethylamine, as well as to other prepared ZIFs, like Co-based ZIF-67, isostructural to ZIF-8.

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Section: Introductionmentioning

confidence: 99%

Sustainable Synthesis of Zeolitic Imidazolate Frameworks at Room Temperature in Water with Exact Zn/Linker Stoichiometry

Molina,

Rodríguez-Campa,

Flores-Borrell

et al. 2024

Nanomaterials

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“…Membranes made of polymeric materials are the most common diffusion membranes for gas separation [22][23][24][25][26][27]. Modification of industrial polymers with various inorganic [28,29], organic [30], and metal-organic frameworks [31,32], as well as polymeric fillers [33,34], represents one of the common approaches to design membranes with improved properties and great prospects. Poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) is a commercially available polymer that is used in gas separation processes and generally demonstrates good permeability but low selectivity, the latter limiting its use [35].…”

Section: Introductionmentioning

confidence: 99%

Copolyimide Brushes as a Component of a Hybrid Poly(phenylene Oxide) Membrane for Controlling Gas Separation: Effect of Water, Methanol, and Hexane Vapors

Tian,

Pulyalina,

Faykov

et al. 2023

Membranes

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The effect of water, methanol, and hexane vapors on gas permeability was studied in a hybrid membrane containing 5 wt% copolyimide brushes with poly(methyl methacrylate) side chains (PI-g-PMMA) in a poly(phenylene oxide) (PPO) matrix, and in a pristine PPO membrane. These membranes in the form of dense nonporous films were further examined by atomic force microscopy (AFM) and scanning electron microscopy (SEM), as well as by measuring their mechanical and gas transport properties. A gas separation study of the membranes in a dry state and the membranes saturated with water, methanol, and hexane vapors was performed to estimate the effect of each vapor on the H2, CO2, N2 permeability and selectivity in the separation of H2/N2 and CO2/N2 pairs. In general, saturation with water, methanol, and hexane vapors caused a decrease in the gas permeability of both membranes. The hybrid membrane containing copolyimide brushes demonstrated enhanced selectivity in the separation of H2/N2 and CO2/N2 pairs. It was found that a special effect of the vapors used for membrane saturation is associated with their molar volume. The solubility and diffusion coefficients of N2 and CO2 were obtained by Grand Canonical Monte Carlo (GCMC) and molecular dynamics (MD) simulations.

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“…These polymers have a number of properties, such as flexibility, chemical resistance and strength, that make them promising for use in membrane technologies [ 54 , 55 , 56 ]. Recently, a number of studies have been carried out on the use of mixed matrix membranes based on PEBA not only for the separation of gases [ 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 ] but also for the extraction of various biofuel components [ 67 , 68 ], alcohols [ 69 , 70 ], desulphurization [ 71 ], alcohol dehydration [ 72 ], esterification [ 73 ] and pervaporation [ 74 , 75 ]. The high degree of combinatoriality in the preparation of block copolymers makes it possible to obtain a large number of commercially available polymers with different compositions and properties [ 76 ].…”

Section: Introductionmentioning

confidence: 99%

Holmium-Containing Metal-Organic Frameworks as Modifiers for PEBA-Based Membranes

Kuzminova,

Dmitrenko,

Salomatin

et al. 2023

Polymers

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Recently, there has been an active search for new modifiers to create hybrid polymeric materials for various applications, in particular, membrane technology. One of the topical modifiers is metal-organic frameworks (MOFs), which can significantly alter the characteristics of obtained mixed matrix membranes (MMMs). In this work, new holmium-based MOFs (Ho-MOFs) were synthesized for polyether block amide (PEBA) modification to develop novel MMMs with improved properties. The study of Ho-MOFs, polymers and membranes was carried out by methods of X-ray phase analysis, scanning electron and atomic force microscopies, Fourier transform infrared spectroscopy, low-temperature nitrogen adsorption, dynamic and kinematic viscosity, static and dynamic light scattering, gel permeation chromatography, thermogravimetric analysis and contact angle measurements. Synthesized Ho-MOFs had different X-ray structures, particle forms and sizes depending on the ligand used. To study the effect of Ho-MOF modifier on membrane transport properties, PEBA/Ho-MOFs membrane retention capacity was evaluated in vacuum fourth-stage filtration for dye removal (Congo Red, Fuchsin, Glycine thymol blue, Methylene blue, Eriochrome Black T). Modified membranes demonstrated improved flux and rejection coefficients for dyes containing amino groups: Congo Red, Fuchsin (PEBA/Ho-1,3,5-H3btc membrane possessed optimal properties: 81% and 68% rejection coefficients for Congo Red and Fuchsin filtration, respectively, and 0.7 L/(m2s) flux).

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Double-Layered Pebax® 3533/ZIF-8 Membranes with Single-Walled Carbon Nanotube Buckypapers as Support for Gas Separation

Cited by 9 publications

References 43 publications

Sustainable Synthesis of Zeolitic Imidazolate Frameworks at Room Temperature in Water with Exact Zn/Linker Stoichiometry

Sustainable Synthesis of Zeolitic Imidazolate Frameworks at Room Temperature in Water with Exact Zn/Linker Stoichiometry

Copolyimide Brushes as a Component of a Hybrid Poly(phenylene Oxide) Membrane for Controlling Gas Separation: Effect of Water, Methanol, and Hexane Vapors

Holmium-Containing Metal-Organic Frameworks as Modifiers for PEBA-Based Membranes

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