Designing ultrathin film composite membranes: the impact of a gutter layer

Kattula, Moon; Ponnuru, Koushik; Zhu, Lingxiang; Jia, Weiguang; Lin, Haiqing; Furlani, Edward P.

doi:10.1038/srep15016

Cited by 113 publications

(110 citation statements)

References 38 publications

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“…Despite the generally accepted opinion that the porous substrate of supported membranes does not significantly affect the mass transfer of low-molecular-weight components in pervaporation, the substrate polymer type, as well as substrate porosity, can have a significant effect on the transport properties of the supported membrane [46][47][48]. In this section, to understand the mechanism of mass transfer in pervaporation, the characteristics of commercial porous substrates PAN and UPM-20 were studied by SEM, AFM, the standard porosimetry method, contact-angle measurements, and ultrafiltration experiments.…”

Section: Influence Of the Substrate On The Mass Transportmentioning

confidence: 99%

Enhanced Pervaporation Properties of PVA-Based Membranes Modified with Polyelectrolytes. Application to IPA Dehydration

et al. 2019

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In this work, dense and supported pervaporation polyvinyl alcohol (PVA)-based membranes modified with poly(allylamine hydrochloride) (PAH) and poly(sodium 4-styrenesulfonate)(PSS)/PAH top nanolayers were synthesized. Two main points were investigated: the role of the polyelectrolyte PAH on water selectivity of the selective polymer matrix and the impact of the porous substrate based on polyacrylonitrile (PAN) and aromatic polysulfone amide (UPM-20 ® ), used to get supported high-performance membranes. Various methods of analysis (fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), atomic force microscopy (AFM), small-angle X-ray scattering (SAXS), porosity, contact angles, ultrafiltration) were applied to study the developed membranes. Transport characteristics of the developed membranes were studied in isopropanol dehydration by pervaporation. Obtained results are discussed in the light of the structure and physicochemical characteristics of these PVA/PAH membranes and the types of porous substrate. It was shown that the PAN-supported membrane with the selective layer based on PVA/PAH modified by 10 polyelectrolyte PSS/PAH bilayers possessed~4.5 times higher permeation flux with the same high selectivity level (99.9 wt % water in the permeate) for the dehydration of the isopropanol (20 wt % water) at 60 • C compared to the commercial analog PERVAP TM 1201.Polymers 2020, 12, 14 2 of 22 repellents, etc. Yet, for industrial application, the solvent must usually be anhydrous. In addition, this alcohol forms an azeotropic mixture with water (12 wt % water-88 wt % isopropanol) [8], which considerably hinders its dehydration via simple traditional methods of separation that entail a non-environmentally friendly process (addition of a third harmful organic reagent) and a high energy consumption (high temperature or low pressure, expensive equipment). Pervaporation is a promising and perspective technology for this task. Different types of pervaporation membranes (polymeric, inorganic, and composite) were developed for the dehydration of isopropanol [9][10][11][12]. Polymeric membranes find wider applications and are attractive because of the simplicity of their fabrication and lower price compared to inorganic membranes. The most popular polymer materials for dehydration are green water-soluble polymers, such as polyvinyl alcohol (PVA), chitosan (CS), cellulose, and sodium alginate [1,13,14], because these polymers possess high selectivity to water. However, the use of membranes based on these polymer materials requires additional cross-linking that, as a rule, leads to the decrease of permeation flux [12]. To improve the transport characteristics, additional bulk and surface modification methods can to be successfully applied, as previously shown [15][16][17][18][19][20].In this study, the selected material is polyvinyl alcohol, which is widely used for dehydration purposes due to its high water selectivity, good film-forming properties, and economic accessibility [1,4,21,22]. However, p...

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Section: Influence Of the Substrate On The Mass Transportmentioning

confidence: 99%

Enhanced Pervaporation Properties of PVA-Based Membranes Modified with Polyelectrolytes. Application to IPA Dehydration

et al. 2019

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“…To demonstrate the potential of these MMMs for membrane applications, they were fabricated into industrial thin film composite (TFC) membranes . As shown in the inset of Figure b, the TFC membrane was fabricated using a selective layer of PBI‐Pd‐58/12 (800 ± 40 nm), a gutter layer of plasma‐etched polydimethylsiloxane (PDMS, 400 ± 20 nm), and a porous PBI support with a pore size of 14 ± 3 nm and porosity of 15 ± 3% at the surface (Figure S10, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Sorption‐Enhanced Mixed Matrix Membranes with Facilitated Hydrogen Transport for Hydrogen Purification and CO₂ Capture

Zhu

Yin

Qin

et al. 2019

Adv Funct Materials

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Mixed matrix membranes (MMMs) comprising size-sieving fillers dispersed in polymers exhibit diffusivity selectivity and may surpass the upper bound for gas separation, but their performance is limited by defects at the polymer/ filler interface. Herein, a fundamentally different approach employing a highly sorptive filler that is inherently less sensitive to interfacial defects is reported. Palladium nanoparticles with extremely high H 2 sorption are dispersed in polybenzimidazole at loadings near the percolation threshold, which increases both H 2 permeability and H 2 /CO 2 selectivity. Performance of these MMMs surpasses the state-of-the-art upper bound for H 2 /CO 2 separation with polymer-based membranes. The success of these sorption-enhanced MMMs for H 2 /CO 2 separation may launch a new research paradigm that taps the enormous knowledge of affinities between gases and nanomaterials to design MMMs for a wide variety of gas separations.

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“…In order to justify the suitability of the membrane as gutter layer with the selective layer, the permeance ratio (P g /P s ), the ratio between the gutter's (P g ) and selective layer's permeance (P s ) was calculated. 6 The ratio should be high so that permeance of the composites would be as near to the intrinsic permeance of the selective layer, maximising performance improvements in TFC. 5 The permeability data from Hosseini et al for P84® polyimide (PI) and the calculated P g /P s is given in Table 2, with assumption that about 0.1-0.5 µm thickness of P84 PI thin film can be coated onto the membrane.…”

Section: Permeance Ratio Between Oxyplus and Selective Layer (P84® Pi)mentioning

confidence: 99%

“…16 From the results, P g /P s was noted to be limited by CO 2 with the lowest permeance ratio of 44 for 0.1 µm P84 PI, which is in the practical range. 5,6 While no details on P84 PI thickness below 1 µm was found, another commercial PI (Matrimid) has been reported with final coating thickness as low as 0.4 µm. 17 Hence, it is safe to say that the P g /P s and the thickness assumption is in the achievable and positive range.…”

Section: Permeance Ratio Between Oxyplus and Selective Layer (P84® Pi)mentioning

confidence: 99%

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Prospect of Oxyplus Hollow Fibre Membrane with Dense Polymethylpentene (PMP) Skin as Support-gutter Layer of Thin Film Composite (TFC) for Biogas upgrading

Shafie¹,

Ahmad²,

Rode³

et al. 2019

JPS

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High selective polymers are bound to exhibit low intrinsic permeability. To mitigate this issue, thin film composite (TFC) membrane has been proposed whereby high selectivity, low permeability thin polymer layers are deposited on top of a thicker, highly permeable (even porous) materials. Nevertheless, deposition of thin film can be complicated on these structures due to limitation of fabrication methods (pore intrusion and support resistance to thin film solvent) and/or reduction of permeation efficiency (lateral diffusion). In this work, the potential of commercial Oxyplus® hollow fibre membrane as support-gutter layer was studied. Polymethylpentene (PMP), the material of the dense skin in Oxyplus has high gas permeability yet glassy enough to be selfstanding, making it a possible candidate as a combined support-gutter layer. Ten fibres were potted together, assembled into a module, and tested in dead-end mode under 1-5 bar transmembrane pressure for CO 2 , CH 4 and N 2 gases. The permeances were registered at 607. 3 ± 31.3 GPU, 156.0 ± 13.1 GPU, and 84.6 ± 6.2 GPU, respectively, equivalent to a separation factor of 7.4 ± 0.4 (CO 2 /N 2 ), 4.0 ± 0.2 (CO 2 /CH 4 ) and 0.6 ± 0.1 (N 2 /CH 4 ). With dense skin layer thickness of 0.1 ± 0.1 µm, these values are comparable to the PMP results in literatures and are suitable as support-gutter layer for low permeability polymers such as P84® polyimide.

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Designing ultrathin film composite membranes: the impact of a gutter layer

Cited by 113 publications

References 38 publications

Enhanced Pervaporation Properties of PVA-Based Membranes Modified with Polyelectrolytes. Application to IPA Dehydration

Enhanced Pervaporation Properties of PVA-Based Membranes Modified with Polyelectrolytes. Application to IPA Dehydration

Sorption‐Enhanced Mixed Matrix Membranes with Facilitated Hydrogen Transport for Hydrogen Purification and CO₂ Capture

Prospect of Oxyplus Hollow Fibre Membrane with Dense Polymethylpentene (PMP) Skin as Support-gutter Layer of Thin Film Composite (TFC) for Biogas upgrading

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Designing ultrathin film composite membranes: the impact of a gutter layer

Cited by 113 publications

References 38 publications

Enhanced Pervaporation Properties of PVA-Based Membranes Modified with Polyelectrolytes. Application to IPA Dehydration

Enhanced Pervaporation Properties of PVA-Based Membranes Modified with Polyelectrolytes. Application to IPA Dehydration

Sorption‐Enhanced Mixed Matrix Membranes with Facilitated Hydrogen Transport for Hydrogen Purification and CO2 Capture

Prospect of Oxyplus Hollow Fibre Membrane with Dense Polymethylpentene (PMP) Skin as Support-gutter Layer of Thin Film Composite (TFC) for Biogas upgrading

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Sorption‐Enhanced Mixed Matrix Membranes with Facilitated Hydrogen Transport for Hydrogen Purification and CO₂ Capture