Enhanced permeation arising from dual transport pathways in hybrid polymer–MOF membranes

Hybrid polymer/inorganic membranes with dual transport pathways exhibit exceptional separation performance for carbon capture and non-classical gas transport behavior upon formation of a percolative network.

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The spirobichroman-based polyimides with different side groups: from structure–property relationships to chain packing and gas transport performance

RSC Advances ◽

10.1039/d0ra10113c ◽

2021 ◽

Vol 11 (9) ◽

pp. 5086-5095

Author(s):

Shuli Wang ◽

Xiaohua Tong ◽

Chunbo Wang ◽

Xiaocui Han ◽

Sizhuo Jin ◽

...

Keyword(s):

Dihedral Angle ◽

Gas Separation ◽

Gas Transport ◽

Critical Role ◽

Polymer Membranes ◽

Separation Performance ◽

Structure Property ◽

Chain Packing ◽

Structure Property Relationships ◽

Gas Separation Performance

Effect of substituents on the dihedral angle and chain packing plays a critical role in the enhancement in the gas separation performance of polymer membranes.

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Polyvinylamine Membranes Containing Graphene-Based Nanofillers for Carbon Capture Applications

Membranes ◽

10.3390/membranes9090119 ◽

2019 ◽

Vol 9 (9) ◽

pp. 119 ◽

Cited By ~ 3

Author(s):

Casadei ◽

Venturi ◽

Giacinti Baschetti ◽

Giorgini ◽

Maccaferri ◽

...

Keyword(s):

Graphene Oxide ◽

Carbon Capture ◽

Mechanical Stability ◽

Composite Membranes ◽

Sem Analysis ◽

Gas Permeation ◽

Separation Performance ◽

Low Grade ◽

Atr Spectroscopy ◽

Few Layer Graphene

In the present study, the separation performance of new self-standing polyvinylamine (PVAm) membranes loaded with few-layer graphene (G) and graphene oxide (GO) was evaluated, in view of their use in carbon capture applications. PVAm, provided by BASF as commercial product named LupaminTM, was purified obtaining PVAm films with two degrees of purification: Low Grade (PVAm-LG) and High Grade (PVAm-HG). These two-grade purified PVAm were loaded with 3 wt% of graphene and graphene oxide to improve mechanical stability: indeed, pristine tested materials proved to be brittle when dry, while highly susceptible to swelling in humid conditions. Purification performances were assessed through FTIR-ATR spectroscopy, DSC and TGA analysis, which were carried out to characterize the pristine polymer and its nanocomposites. In addition, the membranes′ fracture surfaces were observed through SEM analysis to evaluate the degree of dispersion. Water sorption and gas permeation tests were performed at 35 °C at different relative humidity (RH), ranging from 50% to 95%. Overall, composite membranes showed improved mechanical stability at high humidity, and higher glass transition temperature (Tg) with respect to neat PVAm. Ideal CO2/N2 selectivity up to 80 was measured, paired with a CO2 permeability of 70 Barrer. The membranes’ increased mechanical stability against swelling, even at high RH, without the need of any crosslinking, represents an interesting result in view of possible further development of new types of facilitated transport composite membranes.

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Performance of pure and mixed gas transport in reconfigured hybrid inorganic membranes Pt.2

Membrane Technology ◽

10.1016/s0958-2118(12)70145-3 ◽

2012 ◽

Vol 2012 (7) ◽

pp. 7-9 ◽

Cited By ~ 2

Author(s):

Andrew Ohwoka ◽

Iyke Ogbuke ◽

Edward Gobina

Keyword(s):

Gas Transport ◽

Inorganic Membranes ◽

Mixed Gas

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Performance of pure and mixed gas transport in reconfigured hybrid inorganic membranes Pt. 1

Membrane Technology ◽

10.1016/s0958-2118(12)70126-x ◽

2012 ◽

Vol 2012 (6) ◽

pp. 7-12 ◽

Cited By ~ 2

Author(s):

Andrew Ohwoka ◽

Iyke Ogbuke ◽

Edward Gobina

Keyword(s):

Gas Transport ◽

Inorganic Membranes ◽

Mixed Gas

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Analysis of gas transport behavior in organic and inorganic nanopores based on a unified apparent gas permeability model

Petroleum Science ◽

10.1007/s12182-019-00358-4 ◽

2019 ◽

Vol 17 (1) ◽

pp. 168-181 ◽

Cited By ~ 3

Author(s):

Qi Zhang ◽

Wen-Dong Wang ◽

Yilihamu Kade ◽

Bo-Tao Wang ◽

Lei Xiong

Keyword(s):

Pore Pressure ◽

Surface Diffusion ◽

Pore Radius ◽

Gas Transport ◽

Gas Permeability ◽

Knudsen Diffusion ◽

Permeability Model ◽

Real Gas ◽

Apparent Gas Permeability ◽

Transport Behavior

Abstract Different from the conventional gas reservoirs, gas transport in nanoporous shales is complicated due to multiple transport mechanisms and reservoir characteristics. In this work, we presented a unified apparent gas permeability model for real gas transport in organic and inorganic nanopores, considering real gas effect, organic matter (OM) porosity, Knudsen diffusion, surface diffusion, and stress dependence. Meanwhile, the effects of monolayer and multilayer adsorption on gas transport are included. Then, we validated the model by experimental results. The influences of pore radius, pore pressure, OM porosity, temperature, and stress dependence on gas transport behavior and their contributions to the total apparent gas permeability (AGP) were analyzed. The results show that the adsorption effect causes Kn(OM) > Kn(IM) when the pore pressure is larger than 1 MPa and the pore radius is less than 100 nm. The ratio of the AGP over the intrinsic permeability decreases with an increase in pore radius or pore pressure. For nanopores with a radius of less than 10 nm, the effects of the OM porosity, surface diffusion coefficient, and temperature on gas transport cannot be negligible. Moreover, the surface diffusion almost dominates in nanopores with a radius less than 2 nm under high OM porosity conditions. For the small-radius and low-pressure conditions, gas transport is governed by the Knudsen diffusion in nanopores. This study focuses on revealing gas transport behavior in nanoporous shales.

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Arginine/Nanocellulose Membranes for Carbon Capture Applications

Nanomaterials ◽

10.3390/nano9060877 ◽

2019 ◽

Vol 9 (6) ◽

pp. 877 ◽

Cited By ~ 4

Author(s):

Davide Venturi ◽

Alexander Chrysanthou ◽

Benjamin Dhuiège ◽

Karim Missoum ◽

Marco Giacinti Baschetti

Keyword(s):

Amino Acid ◽

Carbon Capture ◽

Aqueous Suspension ◽

Nanofibrillated Cellulose ◽

Separation Performance ◽

Separation Membranes ◽

Gas Separation Membranes ◽

Ideal Selectivity ◽

High Amino Acid ◽

Separation Of Co2

The present study investigates the influence of the addition of l-arginine to a matrix of carboxymethylated nanofibrillated cellulose (CMC-NFC), with the aim of fabricating a mobile carrier facilitated transport membrane for the separation of CO2. Self-standing films were prepared by casting an aqueous suspension containing different amounts of amino acid (15–30–45 wt.%) and CMC-NFC. The permeation properties were assessed in humid conditions (70–98% relative humidity (RH)) at 35 °C for CO2 and N2 separately and compared with that of the non-loaded nanocellulose films. Both permeability and ideal selectivity appeared to be improved by the addition of l-arginine, especially when high amino-acid loadings were considered. A seven-fold increment in carbon dioxide permeability was observed between pure CMC-NFC and the 45 wt.% blend (from 29 to 220 Barrer at 94% RH), also paired to a significant increase of ideal selectivity (from 56 to 185). Interestingly, while improving the separation performance, water sorption was not substantially affected by the addition of amino acid, thus confirming that the increased permeability was not related simply to membrane swelling. Overall, the addition of aminated mobile carriers appeared to provide enhanced performances, advancing the state of the art for nanocellulose-based gas separation membranes.

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Understanding Gas Transport Behavior through Few-Layer Graphene Oxide Membranes Controlled by Tortuosity and Interlayer Spacing

The Journal of Physical Chemistry Letters ◽

10.1021/acs.jpclett.9b03082 ◽

2019 ◽

Vol 10 (24) ◽

pp. 7725-7731 ◽

Cited By ~ 2

Author(s):

Ji Soo Roh ◽

Tae Hwan Choi ◽

Tae Hoon Lee ◽

Hee Wook Yoon ◽

Juyoung Kim ◽

...

Keyword(s):

Graphene Oxide ◽

Gas Transport ◽

Interlayer Spacing ◽

Layer Graphene ◽

Transport Behavior ◽

Few Layer Graphene ◽

Oxide Membranes ◽

Graphene Oxide Membranes

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Grain Boundary Defect Elimination in a Zeolite Membrane by Rapid Thermal Processing

Science ◽

10.1126/science.1176095 ◽

2009 ◽

Vol 325 (5940) ◽

pp. 590-593 ◽

Cited By ~ 204

Author(s):

Jungkyu Choi ◽

Hae-Kwon Jeong ◽

Mark A. Snyder ◽

Jared A. Stoeger ◽

Richard I. Masel ◽

...

Keyword(s):

Grain Boundary ◽

Thermal Processing ◽

Molecular Sieve ◽

Rapid Thermal Processing ◽

Zeolite Membrane ◽

Separation Performance ◽

Transport Pathways ◽

Scalable Production ◽

Defect Elimination ◽

High Separation

Microporous molecular sieve catalysts and adsorbents discriminate molecules on the basis of size and shape. Interest in molecular sieve films stems from their potential for energy-efficient membrane separations. However, grain boundary defects, formed in response to stresses induced by heat treatment, compromise their selectivity by creating nonselective transport pathways for permeating molecules. We show that rapid thermal processing can improve the separation performance of thick columnar films of a certain zeolite (silicalite-1) by eliminating grain boundary defects, possibly by strengthening grain bonding at the grain boundaries. This methodology enables the preparation of silicalite-1 membranes with high separation performance for aromatic and linear versus branched hydrocarbon isomers and holds promise for realizing high-throughput and scalable production of these zeolite membranes with improved energy efficiency.

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