Multi-lab study on the pure-gas permeation of commercial polysulfone (PSf) membranes: Measurement standards and best practices

Rodriguez, Katherine Mizrahi; Wu, Wan-Ni; Alebrahim, Taliehsadat; Cao, Yijun; Freeman, Benny D.; Harrigan, Daniel J.; Jhalaria, Mayank; Kratochvil, Adam; Kumar, Sanat K.; Lee, Won Hee; Lee, Young Moo; Lin, Haiqing; Richardson, Julian M.; Song, Qilei; Sundell, Benjamin J.; Thür, Raymond; Vankelecom, Ivo F.J.; Wang, Anqi; Wang, Lina; Wiscount, Catherine; Smith, Zachary P.

doi:10.1016/j.memsci.2022.120746

Cited by 20 publications

(11 citation statements)

References 48 publications

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“…Thin-film samples were deposited on SiO 2 /Si substrates, and their GIWAXS patterns were acquired on beamline 11-BM Complex Materials Scattering (CMS) beamline of National Synchrotron Light Source II (NSLS-II) at the Brookhaven National Laboratory at a wavelength λ = 0.9184 Å, and penetration depth is calculated based on density of polymers . Pure-gas permeability was determined using a constant-volume and variable-pressure system at 35 °C …”

Section: Methodsmentioning

confidence: 99%

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Carbon Capture Membranes Based on Amorphous Polyether Nanofilms Enabled by Thickness Confinement and Interfacial Engineering

Zhang¹,

Bui²,

Yin

et al. 2023

ACS Appl. Mater. Interfaces

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Thin-film composite membranes are a leading technology for post-combustion carbon capture, and the key challenge is to fabricate defect-free selective nanofilms as thin as possible (100 nm or below) with superior CO 2 /N 2 separation performance. Herein, we developed high-performance membranes based on an unusual choice of semi-crystalline blends of amorphous poly(ethylene oxide) (aPEO) and 18-crown-6 (C6) using two nanoengineering strategies. First, the crystallinity of the nanofilms decreases with decreasing thickness and completely disappears at 500 nm or below because of the thickness confinement. Second, polydimethylsiloxane is chosen as the gutter layer between the porous support and selective layer, and its surface is modified with bio-adhesive polydopamine (<10 nm) with an affinity toward aPEO, enabling the formation of the thin, defect-free, amorphous aPEO/C6 layer. For example, a 110 nm film containing 40 mass % C6 in aPEO exhibits CO 2 permeability of 900 Barrer (much higher than a thick film with 420 Barrer), rendering a membrane with a CO 2 permeance of 2200 GPU and CO 2 /N 2 selectivity of 27 at 35 °C, surpassing Robeson's upper bound. This work shows that engineering at the nanoscale plays an important role in designing highperformance membranes for practical separations.

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Section: Methodsmentioning

confidence: 99%

“…53 Pure-gas permeability was determined using a constant-volume and variablepressure system at 35 °C. 54 TFC membranes were systematically characterized for structural and chemical properties. Field emission SEM (FE-SEM) (Hitachi SU70, Tokyo, Japan) was used to image the surface and cross-section.…”

Section: ■ Conclusionmentioning

confidence: 99%

Carbon Capture Membranes Based on Amorphous Polyether Nanofilms Enabled by Thickness Confinement and Interfacial Engineering

Zhang¹,

Bui²,

Yin

et al. 2023

ACS Appl. Mater. Interfaces

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“…Higher permeabilities were directly linked to increased gas diffusion through the MMM as shown in Figure c,d. We also note that diffusion coefficients calculated for PIM-1 show wider error bars for lighter gases such as CO 2 and O 2 , highlighting inaccuracies of the time-lag method for calculating diffusion coefficients in relatively thin and highly permeable PIM-1 films Figure e,f present the trends of sorption versus volume percent.…”

Section: Resultsmentioning

confidence: 94%

“…Pure- and mixed-gas permeation tests were run on automated constant-volume, variable-pressure systems from Maxwell Robotics, as detailed in our previous work. ,,, After drying in the oven, the films were glued onto brass disks using Devcon 5 Minute epoxy. Samples were glued at the same time to maintain consistent aging profiles.…”

Section: Methodsmentioning

confidence: 99%

“…We also note that diffusion coefficients calculated for PIM-1 show wider error bars for lighter gases such as CO 2 and O 2 , highlighting inaccuracies of the time-lag method for calculating diffusion coefficients in relatively thin and highly permeable PIM-1 films. 53 Figure 5e,f present the trends of sorption versus volume percent. Generally, sorption coefficients remain invariant for PIM-COOH MMMs but show some scattering for PIM-1 MMMs as a function of MOF loading.…”

Section: Influence Of Mof Addition Onmentioning

confidence: 99%

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Engineering the Polymer–MOF Interface in Microporous Composites to Address Complex Mixture Separations

Wu,

Mizrahi Rodriguez,

Roy

et al. 2023

ACS Appl. Mater. Interfaces

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Poor interfacial compatibility remains a pressing challenge in the fabrication of high-performance polymer–MOF composites. In response, introducing compatible chemistries such as a carboxylic acid moiety has emerged as a compelling strategy to increase polymer–MOF interactions. In this work, we leveraged compatible functionalities in UiO-66-NH2 and a carboxylic acid-functionalized PIM-1 to fabricate mixed-matrix membranes (MMMs) with improved separation performance compared to PIM-1-based MMMs in industrially relevant conditions. Under pure-gas conditions, PIM-COOH-based MMMs retained selectivity with increasing MOF loading and showed increased permeability due to increased diffusion. The composites were further investigated under industrially relevant conditions, including CO2/N2, CO2/CH4, and H2S/CO2/CH4 mixtures, to elucidate the effects of competitive sorption and plasticization. Incorporation of UiO-66-NH2 in PIM-COOH and PIM-1 mitigated the effects of CO2- and H2S-induced plasticization typically observed in linear polymers. In CO2-based binary mixed-gas tests, all samples showed similar performance as that in pure-gas tests, with minimal competitive sorption contributions associated with the amine functional groups of the MOF. In ternary mixed-gas tests, improved plasticization resistance and interfacial compatibility resulted in PIM-COOH-based MMMs having the highest H2S/CH4 and CO2/CH4 selectivity combinations among the films tested in this study. These findings demonstrate that selecting MOFs and polymers with compatible functional groups is a useful strategy in developing high-performing microporous MMMs that require stability under complex and industrially relevant conditions.

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Recent advances on covalent organic framework-based membranes for ion selective sieving and wastewater resource utilization

Wang,

Ren,

Wang

et al. 2024

Chemical Engineering Journal

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Multi-lab study on the pure-gas permeation of commercial polysulfone (PSf) membranes: Measurement standards and best practices

Cited by 20 publications

References 48 publications

Carbon Capture Membranes Based on Amorphous Polyether Nanofilms Enabled by Thickness Confinement and Interfacial Engineering

Carbon Capture Membranes Based on Amorphous Polyether Nanofilms Enabled by Thickness Confinement and Interfacial Engineering

Engineering the Polymer–MOF Interface in Microporous Composites to Address Complex Mixture Separations

Recent advances on covalent organic framework-based membranes for ion selective sieving and wastewater resource utilization

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