Mixed matrix membranes comprising polymers of intrinsic microporosity and covalent organic framework for gas separation

Wu, Xingyu; Tian, Zhizhang; Wang, Shaofei; Peng, Dongdong; Yang, Long; Wu, Yingzhen; Xin, Qingping; Wu, Hong; Jiang, Zhongyi

doi:10.1016/j.memsci.2017.01.042

Cited by 184 publications

(92 citation statements)

References 69 publications

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“…S1a Obtained values for pristine PIM-1 and MMMs are shown in Table 2. Pure PIM-1 membranes have a Young's modulus of 1.00 ± 0.21 GPa, a UTS of 41.7 ± 7.1 MPa and an elongation at break of 7.0 ± 1.7 %, which are in good agreement with values for pure PIM-1 freestanding membranes found in the literature [36][37][38].…”

Section: Resultssupporting

confidence: 87%

Impeded physical aging in PIM-1 membranes containing graphene-like fillers

Alberto

Bhavsar

Luque-Alled

et al. 2018

Journal of Membrane Science

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Physical aging of polymer of intrinsic microporosity PIM-1 is one of the major obstacles for its application as a commercial membrane material for gas separation. In this work, physical aging of PIM-1 and matrices of this same polymer containing graphene-like materials were studied.Graphene-like fillers resulted from the functionalization of graphene oxide (GO) with two alkyl chains of different lengths, using octylamine (OA) and octadecylamine (ODA), and further chemical reduction. Extents of membrane aging were evaluated through changes in gas permeability over time;the separation of gas mixtures comprising carbon dioxide and methane, which are of great interest for industrial applications such as the production of biogas or the purification of natural gas, was carried out. 50:50 vol. % CO 2 /CH 4 mixtures were used as feed and separation performance analysed for fresh membranes and at intervals of approximately a month up to 155 days. At the end of this testing period, aged PIM-1 membranes showed a CO 2 permeability of (2.0± 0.7) x 10 3 Barrer, which corresponds to a CO 2 permeability reduction of 68 % from the value obtained right after their fabrication. The addition of alkyl-functionalized GO is shown to be an efficient strategy to retard the physical aging of PIM-1 membranes; filler loadings as low as 0.05 wt.% of reduced octylfunctionalized GO showed a CO 2 permeability of (3.5 ± 0.6) x 10 3 Barrer after 5 months, which is almost three quarters higher than that of pure PIM-1 membrane aged for the same time period and represents a reduction of just 39% from its initial value. Moreover, the addition of graphene-like materials to PIM-1 does not affect its mechanical properties. Highlights Physical aging of mixed matrix membranes (MMMs) composed of PIM-1 and graphene-like materials was investigated. A binary CO 2 /CH 4 (50:50 vol.%) gas mixtures was used. Physical aging was reduced by the incorporation of reduced alkyl-functionalized graphene oxide nanosheets into PIM-1 matrices. Low filler loadings led to higher reduction in physical aging.

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Section: Resultssupporting

confidence: 87%

Impeded physical aging in PIM-1 membranes containing graphene-like fillers

Alberto

Bhavsar

Luque-Alled

et al. 2018

Journal of Membrane Science

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“…Unfortunately, most of the tested membrane materials do not show the desired properties, such as high CO 2 permeance and, at least, average selectivity for tested gases. Moreover, the membranes presented in these works are often very sophisticated and could barely be manufactured on a larger scale [4][5][6][7][8]. On the other hand, there are also successful pilot-scale units for the separation of flue gas in power plants [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Application of Water‐Swollen Thin‐Film Composite Membrane in Flue Gas Purification

et al. 2019

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A water-swollen thin-film composite membrane, which was a reverse osmosis membrane with a thin polyamide layer, was used to separate a model mixture of N 2 , CO 2 , and SO 2 . The polyamide swells with water, and thus, becomes more permeable to polar gases. The flue gas contains water vapor, which must be removed before it is subjected to SO 2 removal. Here moisture is employed to keep the membrane swollen. Using the model mixture, the humidified feed stream is brought to the membrane, where it is cooled below the dew point, so that water condenses on the membrane to keep the polyamide swollen. The membrane showed high CO 2 and SO 2 permeance, but low selectivity, so it could be applied to separate these two gases from N 2 , and thus, is suitable for flue gas purification.

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“…Porous organic frameworks (POFs) [13], such as covalent organic frameworks (COFs) [14,15], conjugated microporous polymers (CMPs) [16], porous aromatic frameworks (PAFs) [17] and covalent triazine-based frameworks (CTFs) [18], are a relatively new category of porous materials constructed from covalent bonds. Given their diversified porosities, tunable chemical properties, inherent light weight and exceptional chemical and thermal stabilities, POFs are promising candidates to be used as fillers in MMMs for CO2 separation [19,20]. For example, Jin et al [21] studied the effect of dispersing COF nanosheets in polyether-blockamide (PEBA) and prepared PEBA-based MMMs, which show 56 % improvement in ideal selectivity towards CO2/N2 compared to the pure PEBA membrane with only 1 wt.% COF loading.…”

Section: Introductionmentioning

confidence: 99%

Benzimidazole linked polymers (BILPs) in mixed-matrix membranes: Influence of filler porosity on the CO2/N2 separation performance

Shan

Seoane

Pustovarenko

et al. 2018

Journal of Membrane Science

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The performance of mixed-matrix membranes (MMMs) based on Matrimid® and benzimidazole-linked polymers (BILPs) have been investigated for the separation CO2/N2 and the dependency on the filler porosity. BILPs with two different porosities (BILP-101 and RT-BILP-101) were synthesized through controlling the initial polymerization rate and further characterized by several techniques (DRIFTs, 13 C CP/MAS NMR, SEM, TEM, N2 and CO2 adsorption). To investigate the influence of porosity, the two types of fillers were incorporated into Matrimid® to prepare MMMs at varied loadings (8, 16 and 24 wt.%). SEM confirmed the well dispersion of BILP-101 and RT-BILP-101 indicating their good compatibility with polymer matrix. The partial pore blockage in the membrane was verified by CO2 adsorption isotherms on the prepared membranes. In the separation of CO2 from a 15:85 CO2:N2 mixture at 308 K, the incorporation of both BILPs fillers resulted in an enhancement in gas permeability together with constant selectivity owing to the fast transport pathways introduced by the porous network. It was noteworthy that the initial porosity of the filler had a large impact in separation permeability. The best improvement was achieved by 24 wt.% RT-BILP-101 MMMs, for which the CO2 permeability increases up to 2.8-fold (from 9.6 to 27 Barrer) compared to the bare Matrimid®.

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Mixed matrix membranes comprising polymers of intrinsic microporosity and covalent organic framework for gas separation

Cited by 184 publications

References 69 publications

Impeded physical aging in PIM-1 membranes containing graphene-like fillers

Impeded physical aging in PIM-1 membranes containing graphene-like fillers

Application of Water‐Swollen Thin‐Film Composite Membrane in Flue Gas Purification

Benzimidazole linked polymers (BILPs) in mixed-matrix membranes: Influence of filler porosity on the CO2/N2 separation performance

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