Enhanced gas separation performance of mixed matrix membranes from graphitic carbon nitride nanosheets and polymers of intrinsic microporosity

Tian, Zhizhang; Wang, Shaofei; Wang, Yutong; Ma, Xiaorui; Cao, Keteng; Peng, Dongdong; Wu, Xingyu; Wu, Hong; Jiang, Zhongyi

doi:10.1016/j.memsci.2016.04.019

Cited by 105 publications

(44 citation statements)

References 63 publications

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“…The enhancement in the mechanical properties observed for some of the MMMs can be attributed to the good dispersion and compatibility between the fillers and the PIM-1 polymer matrix. This consequently leads to a successful load-transfer between the continuous and the dispersed phases of the membranes [39][40][41]. In addition, the increase in elongation at break at lower alkyl-functionalized GO loading might be due to the intrinsic mechanical properties of graphene [42].…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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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“…g‐C 3 N 4 is typically synthesized by thermal polymerization of precursors and their nanosheets are prepared by chemical exfoliation with strong acid, high‐temperature calcination under H 2 , or sonication‐assisted liquid exfoliation depending on the properties of the crude g‐C 3 N 4 . Unlike BN, owing to the small pores of g‐C 3 N 4 with a geometric diameter of 0.31 to 0.34 nm, 2D membranes of g‐C 3 N 4 have nanochannels as an extra pathway for the transport of small molecules …”

Section: Formation Of 2d Nanosheets and Their Composite Membranesmentioning

confidence: 99%

2D Nanosheets and Their Composite Membranes for Water, Gas, and Ion Separation

2019

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Two‐dimensional nanosheets have shown great potential for separation applications because of their exceptional molecular transport properties. Nanosheet materials such as graphene oxides, metal–organic frameworks, and covalent organic frameworks display unique, precise, and fast molecular transport through nanopores and/or nanochannels. However, the dimensional instability of nanosheets in harsh environments diminishes the membrane performance and hinders their long‐term operation in various applications such as gas separation, water desalination, and ion separation. Recent progress in nanosheet membranes has included modification by crosslinking and functionalization that has improved the stability of the membranes, their separation functionality, and the scalability of membrane formation while the membranes’ excellent molecular transport properties are retained. These improvements have enhanced the potential of nanosheet membranes in practical applications such as separation processes.

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“…One way to stabilize the polymer matrix is by introducing several different kinds of fillers to design mixed matrix membranes (MMMs). Main examples for fillers that are used for MMMs are porous materials like MOFs, [101][102][103] carbon nitrides 104 but also microporous polymer networks [105][106][107] and related molecular fillers like organic cages (Fig. 6).…”

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confidence: 99%