Effect of operating pressure and pyrolysis conditions on the performance of carbon membranes for CO2/CH4 and O2/N2 separation derived from polybenzimidazole/Matrimid and UIP-S precursor blends

Behnia, Niaz; Pirouzfar, Vahid

doi:10.1007/s00289-018-2272-7

Cited by 13 publications

(5 citation statements)

References 50 publications

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“…As can be seen, the fitted regression line was obtained with an R 2 value greater than 0.99. A value above R 2 indicates a proper fit of the regression line and the calibration curve [ 45 ].…”

Section: Resultsmentioning

confidence: 99%

Employing Cellulose Nanofiber-Based Hydrogels for Burn Dressing

et al. 2022

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The aim of this research was to fabricate a burn dressing in the form of hydrogel films constructed with cellulose nanofibers (CNF) that has pain-relieving properties, in addition to wound healing. In this study, the hydrogels were prepared in the form of film. For this, CNF at weight ratios of 1, 2, and 3 wt.%, 1 wt.% of hydroxyethyl cellulose (HEC), and citric acid (CA) crosslinker with 10 and 20 wt.% were used. FE-SEM analysis showed that the structure of the CNF was preserved after hydrogel preparation. Cationization of CNF by C6H14NOCl was confirmed by FTIR spectroscopy. The drug release analysis results showed a linear relationship between the amount of absorption and the concentration of the drug. The MTT test (assay protocol for cell viability and proliferation) showed the high effectiveness of cationization of CNF and confirmed the non-toxicity of the resulting hydrogels.

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Section: Resultsmentioning

confidence: 99%

Employing Cellulose Nanofiber-Based Hydrogels for Burn Dressing

et al. 2022

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“…(a) Plot of CO 2 /CH 4 selectivity versus CO 2 permeability for a 21-day-aged 40 wt/wt MOP-18/PIM-1 CMSM (red box solid), alongside CMSMs reported in the literature on Robeson’s CO 2 /CH 4 upper bound . PBI/Matrimid (pink triangle up solid), PBI/UIP-S (blue circle open), P84 (purple circle solid), 6FDA/PMDA-TMMDA (yellow tilted square solid), and PIM-PI (green tilted square open) . (b) Plot of CO 2 /CH 4 selectivity versus CO 2 permeability for fresh (■) and aged (red box) 40 wt/wt MOP-18/PIM-1 CMSMs alongside fresh (▲) and aged (red triangle up open) PIM-1-derived CMSMs.…”

Section: Resultsmentioning

confidence: 99%

Reduced Aging in Carbon Molecular Sieve Membranes Derived from PIM-1 and MOP-18

Cosey

Balkus

Musselman

2021

Ind. Eng. Chem. Res.

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Carbon molecular sieve membranes (CMSMs) commonly lose permeability over time due to the collapse of micropores. This decline in permeability, due to the densification of the membrane, is known as physical aging. CMSMs derived from polymers of intrinsic microporosity (PIM-1) are highly affected by physical aging, with declines in permeability greater than 60% over time. It is hypothesized that the densification of CMSMs derived from this high-free-volume polymer precursor is thermodynamically driven by the collapse of large unconnected graphene domains to reach a more stable conformation (i.e., graphite). This study describes a novel strategy to mitigate physical aging by pillaring the CMSM using copper nanoparticles. Highly soluble metal−organic polyhedra-18 (MOP-18) was introduced into PIM-1 with loadings up to 40 wt/wt to form a mixed-matrix membrane (MMM). Pyrolysis of the MMM at 550 °C resulted in the in situ formation of copper metal nanoparticles that acted as pillars for the graphene sheets within the CMSM, preventing the collapse of the micropores, thus minimizing the aging of the CMSM. Single gas permeation measurements of CO 2 and CH 4 were made on the pristine polymer-derived CMSM and the copper-pillared CMSM at 35 °C and 2 bar to confirm the membranes' resistance to physical aging. The CH 4 permeability for the PIM-1 CMSM decreased by ∼60%, from 64 to 27 Barrers, over a period of 7 days, while the copper-pillared PIM-1 CMSM remarkably showed essentially no decline in CH 4 permeability. This research demonstrates a general approach to reducing physical aging in CMSMs.

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“…These days, membrane technologies have vastly come into consideration for several reasons such as low energy consumption, the low volume of modules, the possibility and availability, without thermal sensitivity, the very negligible pressure drop, low energy loss and low investment costs in comparison with other separation methods [1][2][3][4][5][6]. Regardless of the fact that membrane technologies have remarkable advantages in comparison with other separation methods, membrane processes are mainly dealt with several problems such as concentration polarization, blockage, not predicting the proper behavior of the membrane, stability, incomplete separation, puri cation and low permeability [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Gas transport characteristics of mixed matrix membrane containing MIL-100 (Fe) metal-organic frameworks and PEBAX precursors

Pirouzfar

Roustaie

2023

Korean J. Chem. Eng.

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In this research, the effect of adding MIL-100 (Fe) MOFs on the PEBAX membranes has been scrutinized in two grades of 1657 and 2533. Initially, the intended membranes were synthesized by the solutioncasting method. Then, the XRD and SEM were applied to deliberate the in uence of adding to the structure of both types of membranes. In consequence, the separation function of the pair gases of CO 2 /CH 4 CO 2 /N 2 and CO 2 /O 2 and their permeability were considered at the pressure of 3.5 bar and temperature of 25°C. Eventually, their function was compared by Robeson diagrams of 1991 and 2008. The comparison results by Robeson diagrams indicated that the PEBAX1657/MIL-100 (Fe) and PEBAX2533/MIL-100 (Fe) membranes containing 5 wt.% of MOF represent more suitable performance in separating CO 2 /CH 4 in comparison with the axis of the Robeson diagram. However, their function for separating the aforementioned gases requires more modi cations.

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Effect of operating pressure and pyrolysis conditions on the performance of carbon membranes for CO2/CH4 and O2/N2 separation derived from polybenzimidazole/Matrimid and UIP-S precursor blends

Cited by 13 publications

References 50 publications

Employing Cellulose Nanofiber-Based Hydrogels for Burn Dressing

Employing Cellulose Nanofiber-Based Hydrogels for Burn Dressing

Reduced Aging in Carbon Molecular Sieve Membranes Derived from PIM-1 and MOP-18

Gas transport characteristics of mixed matrix membrane containing MIL-100 (Fe) metal-organic frameworks and PEBAX precursors

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