Nafion/PEG hybrid membrane for CO2 separation: Effect of PEG on membrane micro-structure and performance

Dai, Zhongde; Aboukeila, Hesham; Deng, Jing; Ansaloni, Luca; Baschetti, Marco Giacinti; Deng, Liyuan

doi:10.1016/j.seppur.2018.03.062

Cited by 59 publications

(18 citation statements)

References 63 publications

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“…The gas permeation performance of MMMs was conducted using a mixed-gas permeation setup reported in our previous work. , The feed gas was the CO 2 /N 2 (10/90 vol %) gas mixture, whereas pure CH 4 was used as the sweep gas. The water vapor was introduced by humidified feed and sweep gas, and the humid gases were mixed with dry gases with an accurate flow ratio to achieve the desired relative humidity (RH, %).…”

Section: Methodsmentioning

confidence: 99%

Morphologically Tunable MOF Nanosheets in Mixed Matrix Membranes for CO₂ Separation

et al. 2020

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This study first develops a facile method to synthesize zeolitic imidazolate framework cuboid (ZIF-C) nanosheets with tunable thickness from 70 to 170 nm from aqueous polymer solutions. The obtained ZIF-C nanosheets were characterized by various techniques, including X-ray diffractometry (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), N2 adsorption and thermogravimetric analysis (TGA), to understand their compositional and structural properties. The synthesized ZIF-Cs nanosheets with different thicknesses were further applied as nanofillers to prepare Pebax-based mixed matrix membranes (MMMs) to study the effect of the morphology on membrane properties and CO2/N2 separation performances under different relative humidity (RH) conditions. Results reveal that the incorporation of these ZIF-Cs simultaneously enhances CO2 permeability and CO2/N2 selectivity in the mixed matrix membranes. In addition, MMMs with the thickest ZIF-C nanosheet present better performance. A CO2 permeability of 387.2 Barrer accompanied with a CO2/N2 selectivity of 47.1 has been documented, nearly doubled in CO2 permeability with slightly increased selectivity compared with membranes containing thinner nanosheets.

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Section: Methodsmentioning

confidence: 99%

Morphologically Tunable MOF Nanosheets in Mixed Matrix Membranes for CO₂ Separation

et al. 2020

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“…• The use of plasticizers into dope solutions, such as RDP Fyrolflex, dibutyl phthalate, polyethylene glycol (PEG), and 4-hydroxy benzophenone, contributes to the decrease in the main polymer glass transition temperature and therefore in the maintenance of the chain mobility and flexibility over the membrane preparation. The PEG acts as an artificial plasticizer and free volume regulator, which can also be beneficial to the diffusivity and solubility of CO 2 into polymeric hybrid membranes (Loloei et al, 2015;Dai et al, 2019). • During the casting step, the polymer dope solution can be deposited onto a dense liquid surface with high surface tension to skip any possible membrane adhesion on the casting surface.…”

Section: Protocols For Mitigating Non-desired Interfacial Defectsmentioning

confidence: 99%

Tuning of Nano-Based Materials for Embedding Into Low-Permeability Polyimides for a Featured Gas Separation

2020

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Several concepts of membranes have emerged, aiming at the enhancement of separation performance, as well as some other physicochemical properties, of the existing membrane materials. One of these concepts is the well-known mixed matrix membranes (MMMs), which combine the features of inorganic (e.g., zeolites, metal-organic frameworks, graphene, and carbon-based materials) and polymeric (e.g., polyimides, polymers of intrinsic microporosity, polysulfone, and cellulose acetate) materials. To date, it is likely that such a concept has been widely explored and developed toward low-permeability polyimides for gas separation, such as oxydianiline (ODA), tetracarboxylic dianhydride-diaminophenylindane (BTDA-DAPI), m-phenylenediamine (m-PDA), and hydroxybenzoic acid (HBA). When dealing with the gas separation performance of polyimide-based MMMs, these membranes tend to display some deficiency according to the poor polyimide-filler compatibility, which has promoted the tuning of chemical properties of those filling materials. This approach has indeed enhanced the polymer-filler interfaces, providing synergic MMMs with superior gas separation performance. Herein, the goal of this review paper is to give a critical overview of the current insights in fabricating MMMs based on chemically modified filling nanomaterials and low-permeability polyimides for selective gas separation. Special interest has been paid to the chemical modification protocols of the fillers (including good filler dispersion) and thus the relevant experimental results provoked by such approaches. Moreover, some principles, as well as the main drawbacks, occurring during the MMM preparation are also given.

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“…Gas-separation performance was measured in a humid mixed-gas permeation setup with adjustable RH, as schematically depicted in Figure 3 . More details about the testing procedure can be found in our previous reports [ 35 , 36 ]. The RH value is controlled by using four mass flow controllers (El-Flow series, Bronkhorst, Veenendaal, Netherland).…”

Section: Methodsmentioning

confidence: 99%

Poly(1-trimethylsilyl-1-propyne)-Based Hybrid Membranes: Effects of Various Nanofillers and Feed Gas Humidity on CO2 Permeation

et al. 2018

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Poly(1-trimethylsilyl-1-propyne) (PTMSP) is a high free volume polymer with exceptionally high gas permeation rate but the serious aging problem and low selectivity have limited its application as CO2 separation membrane material. Incorporating inorganic nanoparticles in polymeric membranes has been a common approach to improve the separation performance of membranes, which has also been used in PTMSP based membrane but mostly with respect to tackling the aging issues. Aiming at increasing the CO2 selectivity, in this work, hybrid membranes containing four types of selected nanofillers (from 0 to 3D) were fabricated using PTMSP as the polymer matrix. The effects of the various types of nanofillers on the CO2 separation performance of the resultant membranes were systematically investigated in humid conditions. The thermal, chemical and morphologic properties of the hybrid membranes were characterized using TGA, FTIR and SEM. The gas permeation properties of the hybrid membranes were evaluated using mixed gas permeation test with the presence of water vapour to simulate the flue gas conditions. Experiments show that the addition of different fillers results in significantly different separation performances; The addition of ZIF-L porous 2D filler improves the CO2/N2 selectivity at the expenses of CO2 permeability, while the addition of TiO2, ZIF-7 and ZIF-8 increases the CO2 permeability but the CO2/N2 selectivity decreases.

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Nafion/PEG hybrid membrane for CO2 separation: Effect of PEG on membrane micro-structure and performance

Cited by 59 publications

References 63 publications

Morphologically Tunable MOF Nanosheets in Mixed Matrix Membranes for CO₂ Separation

Morphologically Tunable MOF Nanosheets in Mixed Matrix Membranes for CO₂ Separation

Tuning of Nano-Based Materials for Embedding Into Low-Permeability Polyimides for a Featured Gas Separation

Poly(1-trimethylsilyl-1-propyne)-Based Hybrid Membranes: Effects of Various Nanofillers and Feed Gas Humidity on CO2 Permeation

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Nafion/PEG hybrid membrane for CO2 separation: Effect of PEG on membrane micro-structure and performance

Cited by 59 publications

References 63 publications

Morphologically Tunable MOF Nanosheets in Mixed Matrix Membranes for CO2 Separation

Morphologically Tunable MOF Nanosheets in Mixed Matrix Membranes for CO2 Separation

Tuning of Nano-Based Materials for Embedding Into Low-Permeability Polyimides for a Featured Gas Separation

Poly(1-trimethylsilyl-1-propyne)-Based Hybrid Membranes: Effects of Various Nanofillers and Feed Gas Humidity on CO2 Permeation

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Morphologically Tunable MOF Nanosheets in Mixed Matrix Membranes for CO₂ Separation

Morphologically Tunable MOF Nanosheets in Mixed Matrix Membranes for CO₂ Separation