Gas separation in mixed matrix membranes based on polyurethane containing SiO 2 , ZSM-5, and ZIF-8 nanoparticles

Self Cite

In this study, we fabricated a dual-layer PES-poly(ether-block-amide) (PEBA) composite membrane that included zeolitic-midazolate framework 8 (ZIF-8) particles and evaluated it for propylene and propane separation under pure and mixed feed conditions. To improve the performance, compatibility, and distribution of particles in the polymer matrix, the ZIF-8 particles were modified by 3-(triethoxysilyl) propyl amine (APTES) and 3-(trimethoxysilyl) propyl amine (APTMS) amino silane coupling agents. Particle modification did not have much effect on the structure and particle size and slightly reduced the membrane specific surface area. The modified particles tended to be in the soft section. At the high loading rate of modified particles, their appropriate compatibility increased the membrane gas permeability ( ) and selectivity. APTES with the proper chain length compared with APTMS had a higher and the same selectivity. The best performance (by 32.1 gpu) was found in PES-PEBA-ZIF-8-APTES 20%. V C 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46273.

Section: Introductionmentioning

confidence: 99%

Modified zeolitic–midazolate framework 8/poly(ether‐block‐amide) mixed‐matrix membrane for propylene and propane separation

Amedi

Aghajani

2018

Self Cite

“…The separation performance of PU MMMs depends on the filler type and the interactions between the PU and the filler. For example, the effects of three different nanoparticles (silica, ZSM‐5, and ZIF‐8) on the CO 2 /CH 4 separation properties of PU membranes were studied . Because of the narrower pore size and better compatibility of ZIF‐8, the ZIF‐8‐PU membrane exhibited the best selectivity and permeability among all samples.…”

Section: Introductionmentioning

confidence: 81%

“…For example, the effects of three different nanoparticles (silica, ZSM-5, and ZIF-8) on the CO 2 /CH 4 separation properties of PU membranes were studied. 57 Because of the narrower pore size and better compatibility of ZIF-8, the ZIF-8-PU membrane exhibited the best selectivity and permeability among all samples. The decrease in selectivity was also reported for UiO66-PU and MIL-101-PU MMMs, which can be ascribed to the low compatibility of the fillers with PU chains.…”

Section: Introductionmentioning

confidence: 89%

“…While there have been many studies on MOF‐based MMMs for gas separation, a limited number of studies on MOF‐PU MMMs have been reported . In this study, we synthesized HDC nanoparticles and a polyurethane–urea (PUU) elastomer, and then used them to fabricate MMMs.…”

Section: Introductionmentioning

confidence: 99%

“…64 While there have been many studies on MOF-based MMMs for gas separation, a limited number of studies on MOF-PU MMMs have been reported. 57,58,65 In this study, we synthesized HDC nanoparticles and a polyurethane-urea (PUU) elastomer, and then used them to fabricate MMMs. Our previous study showed the potential of HDC nanoparticles for improving the selectivity of glassy polymers.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Improved gas transport properties of polyurethane–urea membranes through incorporating a cadmium‐based metal organic framework

Sadeghi

Isfahani

Shamsabadi

et al. 2019

The increasing need for more efficient separation processes has motivated the development of polymer membranes that can provide fast and selective transport. In this work, cadmium‐based metal–organic framework (MOF) nanoparticles and a polyurethane–urea (PUU) elastomer were synthesized. New mixed‐matrix membranes (MMMs) were then fabricated from the nanoparticles and the PUU. SEM images verified that embedding the nanoparticles changes the morphology of the PUU and the nanoparticles disperse well in the PUU due to satisfactory compatibility of the polymer and nanoparticles. Fourier transform infrared spectroscopy and X‐ray diffraction analysis confirmed the dispersion of the nanoparticles in the soft segment of the PUU. With increased temperature, gas permeabilities of the MMMs improved but their sieving ability deteriorated. An MMM incorporating 2.5 wt % of the MOF showed a CO2 permeability of ~140 barrer and a CO2/N2 selectivity of ~30, which are 89 and 38% higher than those of the pristine membrane. Gas permeation tests showed that the higher CO2/N2 selectivity of the MMMs was due to improved solubility selectivity and the higher CO2 permeability was a result of improved CO2 diffusivity and solubility coefficients. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 137, 48704.

AtmosphericCO₂/CH₄permeability ofEVAcopolymer/SiO₂composite membrane for biogas purification

Watasit

Rukchonlatee

Ausavasukhi

et al. 2021

The CO 2 and CH 4 permeabilities of poly(ethylene-co-vinyl acetate) (EVA)/ SiO 2 composite membrane were investigated at atmospheric pressure. The membranes were fabricated by compression molding and characterized by Fourier transformed infrared spectroscopy, differential scanning calorimetry, a universal testing machine, and a contact angle analyzer. The effect of vinyl acetate content (18-33 wt%) was evaluated for both single-gas and mixed-gas permeation systems. A non-pressurized homemade-permeation cell was used for the single-gas permeation of CO 2 and CH 4 , while a tubular membrane was utilized for a continuous separation of CO 2 /CH 4 mixture. CO 2 flux was readily increased (from 0.7 to 2.0 ml/m 2 .s) with vinyl acetate content (18-33 wt%). The enhanced CO 2 permeability is attributed to the increase in polarity and also the decrease in crystallinity of the membrane. A satisfied gas separation selectivity (CO 2 /CH 4 ) of 4.31 could be obtained from tubular membrane with 28 wt% VA content. The incorporation of SiO 2 as a filler (0.5-2.0 wt%) especially increased the membrane polarity and hence the CO 2 flux up to 6.0 ml/m 2 .s. However, the CH 4 flux was not affected by VA and SiO 2 contents.