Characterization and molecular simulation of Pebax-1657-based mixed matrix membranes incorporating MoS2 nanosheets for carbon dioxide capture enhancement

Liu, Yu‐Cheng; Chen, Cian Yu; Lin, Geng; Chen, Chien Hua; Wu, Kevin C.‐W.; Lin, Chia Her; Tung, Kuo‐Lun

doi:10.1016/j.memsci.2019.04.025

Cited by 78 publications

(15 citation statements)

References 46 publications

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“…While the type of Pebax ® more commonly used in carbon capture membrane applications is Pebax ® 1657, made of nylon-6 and PEO with a respective ratio of 40/60 in mass, other materials of the family also possess interesting performances, such as Pebax ® 2533, which was employed in this work as matrix due to the higher CO 2 permeability showed with respect to Pebax ® 1657 (about 130–351 barrer against 45–80 barrer) although with lower CO 2 /N 2 selectivity (about 25–34 against 43–80) in experiments conducted in mild conditions (pressure upstream of 1–2 bar and temperature from 20 to 35 °C) [ 27 , 28 , 29 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ].…”

Section: Introductionmentioning

confidence: 99%

Pebax® 2533/Graphene Oxide Nanocomposite Membranes for Carbon Capture

et al. 2020

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In this work, the behavior of new GO-based mixed matrix membranes was tested in view of their use as CO2-selective membrane in post combustion carbon capture applications. In particular, the new materials were obtained by mixing of Pebax® 2533 copolymer with different types of graphene oxide (GO). Pebax® 2533 has indeed lower selectivity, but higher permeability than Pebax® 1657, which is more commonly used for membranes, and it could therefore benefit from the addition of GO, which is endowed with very high selectivity of CO2 with respect to nitrogen. The mixed matrix membranes were obtained by adding different amounts of GO, from 0.02 to 1% by weight, to the commercial block copolymers. Porous graphene oxide (PGO) and GO functionalized with polyetheramine (PEAGO) were also considered in composites produced with similar procedure, with a loading of 0.02%wt. The obtained films were then characterized by using SEM, DSC, XPS analysis and permeability experiments. In particular, permeation tests with pure CO2 and N2 at 35°C and 1 bar of upstream pressure were conducted for the different materials to evaluate their separation performance. It has been discovered that adding these GO-based nanofillers to Pebax® 2533 matrix does not improve the ideal selectivity of the material, but it allows to increase CO2 permeability when a low filler content, not higher than 0.02 wt%, is considered. Among the different types of GO, then, porous GO seems the most promising as it shows CO2 permeability in the order of 400 barrer (with an increase of about 10% with respect to the unloaded block copolymer), obtained without reducing the CO2/N2 selectivity of the materials, which remained in the order of 25.

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Section: Introductionmentioning

confidence: 99%

Pebax® 2533/Graphene Oxide Nanocomposite Membranes for Carbon Capture

et al. 2020

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“…Mixed matrix membranes based on amine-functionalized and pristine MIL-53(Al) in Pebax1657 have shown an increased CO2 separation and the higher permeability (PCO2 100 Barrer and αCO2/CH4 = 17; CO2/N2 = 50), was attributed to high porosity introduced by the presence of the MOF, as well as the selective adsorption of CO2 inside the MOF [41]. Liu et al designed nanosheet-enhanced Pebax-MoS2 mixed matrix membranes for CO2 capture, increasing CO2/N2 selectivity until 90 [44]. Composite hollow fibre membranes with a selective layer of Pebax ® 1657 and different functionalized Uio-66 MOF have Pebax ® 1657 is a thermoplastic elastomer multiblock-copolymer containing linear chains of rigid polyamide segments interspaced with flexible polyether segments.…”

Section: Introductionmentioning

confidence: 99%

Glassy PEEK-WC vs. Rubbery Pebax®1657 Polymers: Effect on the Gas Transport in CuNi-MOF Based Mixed Matrix Membranes

et al. 2020

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Mixed matrix membranes (MMMs) are seen as promising candidates to overcome the fundamental limit of polymeric membranes, known as the so-called Robeson upper bound, which defines the best compromise between permeability and selectivity of neat polymeric membranes. To overcome this limit, the permeability of the filler particles in the MMM must be carefully matched with that of the polymer matrix. The present work shows that it is not sufficient to match only the permeability of the polymer and the dispersed phase, but that one should consider also the individual contributions of the diffusivity and the solubility of the gas in both components. Here we compare the gas transport performance of two different MMMs, containing the metal-organic framework CuNi-MOF in the rubbery Pebax ® 1657 and in the glassy poly(ether-ether-ketone) with cardo moiety, PEEK-WC. The chemical and structural properties of MMMs were investigated by means of FT-IR spectroscopy, scanning electron microscopy and EDX analysis. The influence of MOF on the mechanical and thermal properties of both polymers was investigated by tensile tests and differential scanning calorimetry, respectively. The MOF loading in Pebax ® 1657 increased the ideal H 2 /N 2 selectivity from 6 to 8 thanks to an increased H 2 permeability. In general, the MOF had little effect on the Pebax ® 165 membranes because an increase in gas solubility was neutralized by an equivalent decrease in effective diffusivity. Instead, the addition of MOF to PEEK-WC increases the ideal CO 2 /CH 4 selectivity from 30 to~48 thanks to an increased CO 2 permeability (from 6 to 48 Barrer). The increase in CO 2 permeability and CO 2 /CH 4 selectivity is maintained under mixed gas conditions. natural gas treatment (CO 2 /CH 4 ) [6], and post-combustion carbon capture from flue gas (CO 2 /N 2 ) [7]. This increasing interest is dictated by the advantages of membrane technology compared to traditional gas separation techniques. Gas separation by means of membrane technology is an economical process; it is easily scalable and it can be used in non-drastic temperature and pressure conditions, which are more environmentally friendly. Despite numerous efforts to develop new materials for gas separation, the membrane market still needs to overcome some challenges. In fact, the highly permeable rubbery polymers present low selectivity, and the highly-selective glassy polymers are less permeable. To overcome this trade-off between permeability and selectivity, extensively reported by Robeson in 1991 and in 2008 [8,9], researchers are focusing on the design and development of hybrid membranes based on the combination of two different materials in order to get the advantages of both [10]. According to this concept, a valid strategy is the embedding of porous metal-organic frameworks (MOFs) in the polymer matrix in order to obtain mixed matrix membranes (MMMs) with enhanced gas transport properties [11][12][13][14][15][16]. MOFs are an attractive new class of microporous materials built by the combination o...

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“…[439] Nanofillers of different dimensions are therefore added to polymers to mitigate the trade-off by tailoring the mass transport properties of composite membranes. [440,441] A myriad of 2D nanofillers, including GO, [367][368][369][370] MoS 2 , [442,443] and Ti 3 C 2 T x [163,164], are of particular interests because of their high aspect ratios and excellent barrier properties. [350,352] 2D MOF nanosheets are emerging nanofillers for gas separation membranes with high permeabilities and selectivities [41,374].…”

Section: Barrier Filmsmentioning

confidence: 99%