Nanofiltration membranes from crosslinked Troger's base Polymers of Intrinsic Microporosity (PIMs)

Agarwal, Praveen; Hefner, Robert E.; Ge, Shouren; Tomlinson, Ian A.; Rao, YuanQiao; Dikic, T Tamara

doi:10.1016/j.memsci.2019.117501

Cited by 28 publications

(12 citation statements)

References 15 publications

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“…Comparitive data for microporous TFCs (PAR‐TTSBI/PI and PAR‐BHPF/PI) obtained from Jimenez‐Solomon et al [ 27 ] b) Rejection of selected solutes through fabricated TFCs in water. Comparitive data for microporous TFCs obtained from Kandambeth et al [ 50 ] (M‐TpBD) and Agarwal et al [ 51 ] (TB‐OH and TB‐OH CS). c) Permeance of methanol versus selectivity for small solutes (210–320 g mol −1 ) for state‐of‐the‐art TFCs.…”

Section: Figurementioning

confidence: 82%

“…Comparably, previous attempts to analyze the feasbility of microporous materials for aqueous separations demonstrated improved permeance but coupled with significant losses in solute rejection and MWCO as shown for Tröger's base PIMs (TB‐OH and TB‐OH CS) and covalent organic framework (COF)‐based membranes (M‐TpBD) in Figure 3b. [ 50,51 ] The ability to couple high permeance with high rejection truly differentiates the MPDTrip TFCs in this study to previous approaches which resulted in permeance gains with significant rejection losses for liquid separations [ 27,50–59 ] and fills a consistently reiterated need in the chemical industry. [ 48,49,66,67 ]…”

Section: Figurementioning

confidence: 93%

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Finely Tuned Submicroporous Thin‐Film Molecular Sieve Membranes for Highly Efficient Fluid Separations

et al. 2020

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promising energy efficient separation processes in the chemical separation industry. Its continued growth can be attributed to lower energy requirements translating to lower capital and operating cost as well as significantly reduced environmental impact compared to conventional thermal separation processes. Additionally, membrane technology offers the advantages of continuous process operation, modular design, and small system footprint and is predicted to be a main contributor to global energy-and carbon-reduction initiatives in the coming decades. [2] In 2008, the global membrane market was valued at ≈12 billion USD with a compound annual growth rate (CAGR) of ≈10%. [3] Reverse osmosis (RO) and nanofiltration (NF) membranes contribute significantly to the total global membrane sales with the majority of products comprising of variations of thin-film composite (TFC) membranes made by interfacial polymerization. Such highly crosslinked aromatic submicroporous (i.e., pore size < 4 Å) [4] polyamide TFC membranes-pioneered by John Cadotte-revolutionized the desalination industry due to their unprecedented combination of high water flux and salt rejection. [5][6][7][8] Surprisingly, despite their immense commercial success for aqueous RO and NF applications, the IP membrane formation process has not been implemented in other large-scale fluid separation processes, especially organic solvent nanofiltration (OSN) and gas separations. [9][10][11] Polymers of intrinsic microporosity (PIMs) are an emerging group of solution processible amorphous microporous materials (pore size < 20 Å) gaining significant attention in membranebased separations due to their ability to transcend the conventional permeability/selectivity trade-off relationships. [12][13][14][15] Such materials exhibit exceptionally high free volumes as a result of inefficient chain packing by architectural designs using highly rigid and contorted spirobisindane-, triptycene-, ethanoanthracene-, and Tröger's base-building blocks. [13,[16][17][18][19][20][21] To date, technical challenges associated with fabricating defect-free, inexpensive, thin-film composite membranes as well as the inability to achieve low-molecular-weight cutoffs (MWCOs) have severely limited the industrial use of PIM-based and similar membrane materials. For example, Cook et al. demonstrated successful Polymeric membranes with increasingly high permselective performances are gaining a significant role in lowering the energy burden and improving the environmental sustainability of complex chemical separations. However, the commercial deployment of newly designed materials with promising intrinsic properties for fluid separations has been stalled by challenges associated with fabrication and scale up of low-cost, high-performance, defect-free thin-film composite (TFC) membranes. Here, a facile method to fabricate next-generation TFC membranes using a bridged-bicyclic triptycene tetra-acyl chloride (Trip) building block with a large fraction of finely tuned structural submicroporosity (por...

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Section: Figurementioning

confidence: 82%

Section: Figurementioning

confidence: 93%

Finely Tuned Submicroporous Thin‐Film Molecular Sieve Membranes for Highly Efficient Fluid Separations

et al. 2020

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“…Comparably, previous attempts to analyze the feasbility of microporous materials for aqueous separations demonstrated improved permeance but coupled with significant losses in solute rejection and MWCO as shown for Tröger's base PIMs (TB-OH and TB-OH CS) and covalent organic-framework-based membranes (M-TpBD) in Figure 3b. [50,51] The ability to couple high permeance with high rejection truly differentiates the MPDTrip TFCs in this study to previous approaches which resulted in permeance gains with significant rejection losses for liquid separations [27,[50][51][52][53][54][55][56][57][58][59] and fills a consistently reiterated need in the chemical industry. [48,49,66,67] Filtration performance of MPDTrip-20 TFCs with methanol was further evaluated via the permeance/selectivity trade-off (displayed in Figure 3c) in comparison to state-of-the-art TFC membranes.…”

mentioning

confidence: 86%

“…Comparitive data for microporous TFCs (PAR-TTSBI/PI and PAR-BHPF/PI) obtained from Jimenez-Solomon et al[27] , (b) rejection of selected solutes through fabricated TFCs in water. Comparitive data for microporous TFCs obtained from Kandambeth et al[50] (M-TpBD) and Agarwal et al[51] (TB-OH and TB-OH CS), (c) permeance of methanol vs. selectivity for small solutes (210 -320 g mol -1 ) for state-of-the-art TFCs. Comparative data were obtained from the literature[27,[52][53][54][55][56][57][58][59] with details shown in TableS12, (d) sodium chloride rejection comparison of the MPDTrip-20 TFC membrane fabricated in this study with state-ofthe-art desalination membranes.…”

mentioning

confidence: 97%

Chemical Separation: Finely Tuned Submicroporous Thin‐Film Molecular Sieve Membranes for Highly Efficient Fluid Separations (Adv. Mater. 22/2020)

et al. 2020

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Novel thin‐film composite membranes containing entrapped structural submicroporosity (pore size of <4 Å) exhibit superb performance for removal of small solutes from aqueous or organic solutions, as discussed by Ingo Pinnau and co‐workers in article number 2001132. The membranes potentially lower the energy burden and improve the environmental sustainability of chemical separations, which are currently based on thermal principles and account for approximately 10–15% of the world's total energy consumption.

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“…Fabricating RO membranes with compact but hydrophilic surface seems to be a facile way to get high B rejection without obvious flux loss. Many materials have been used in membrane modification to obtain RO membranes with a compact surface 32,33 . Among these materials, glutaric dialdehyde (GA) is considered to be a hydrophilic cross‐linking agent.…”

Section: Introductionmentioning

confidence: 99%

Boron removal with modified polyamide RO modules by cross‐linked glutaric dialdehyde grafting

Chen

Zhao

2020

J of Chemical Tech & Biotech

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BACKGROUNDReverse osmosis (RO) plays an increasingly important role in boron removal. In this study, novel polyamide RO membranes and modules with high boron rejection were fabricated by cross‐linked glutaric dialdehyde (GA) grafting. To evaluate the influence of GA grafting on membrane materials, the surface properties before and after modification were analyzed.RESULTSThe results showed that the membrane morphology changed distinctly after GA modification. All modified membranes became more hydrophilic as the water contact angle decreased from 60° to 35°. The zeta potential of RO membrane surface increased from −6.23 mV to 17.27 mV, which indicated that the surface charge altered from negative to positive. The rejection of boron increased from 76.65% to 90.14% and the boron permeability coefficient decreased from 3.71 to 0.79. Furthermore, the rejection of boron for modified module was >90% over a 5–22 ppm range of boron concentration. The rejection of boron also stabilized at ≈90% beyond 3000 min.CONCLUSIONThe modified RO membrane modules with high boron rejection and acceptable flux could be used in boron removal. The approach in this study can improve the separation properties of boron for commercially available modules without disassembling. © 2020 Society of Chemical Industry (SCI)

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Nanofiltration membranes from crosslinked Troger's base Polymers of Intrinsic Microporosity (PIMs)

Cited by 28 publications

References 15 publications

Finely Tuned Submicroporous Thin‐Film Molecular Sieve Membranes for Highly Efficient Fluid Separations

Finely Tuned Submicroporous Thin‐Film Molecular Sieve Membranes for Highly Efficient Fluid Separations

Chemical Separation: Finely Tuned Submicroporous Thin‐Film Molecular Sieve Membranes for Highly Efficient Fluid Separations (Adv. Mater. 22/2020)

Boron removal with modified polyamide RO modules by cross‐linked glutaric dialdehyde grafting

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