Breaking through permeability–selectivity trade‐off of thin‐film composite membranes assisted with crown ethers

Shen, Liang; Yi, Ming; Japip, Susilo; Han, Chao; Tian, Li; Lau, Cher Hon; Wang, Yan

doi:10.1002/aic.17173

Cited by 20 publications

(6 citation statements)

References 57 publications

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“…The normalized flux after fouling test in Figure a shows that, fouling behaviors of 3,4-DABA and 3,5-DABA membranes are severer than that of the control membrane, particularly for 3,5-DABA membrane. As depicted in Figure c that Ca 2+ ions exhibit strong complexion with carboxylic groups, thus they can act as bridges to link alginate molecules and the polyamide surface, as well as two alginate molecules . As a result, a compact alginate fouling layer is formed on the membrane surface and hence results in the flux decline.…”

Section: Resultsmentioning

confidence: 99%

“…As depicted in Figure 5c that Ca 2+ ions exhibit strong complexion with carboxylic groups, thus they can act as bridges to link alginate molecules and the polyamide surface, as well as two alginate molecules. 48 As a result, a compact alginate fouling layer is formed on the membrane surface and hence results in the flux decline. Since more carboxylic acid groups are introduced to 3,5-DABA membrane, they leads to the formation of a denser SA gel layer and thus the severer flux decline.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Thin-Film Composite Polyamide Membranes with In Situ Attached Ag Nanoparticles for Fouling-Mitigated Wastewater Treatment

Tian

Liu

et al. 2021

ACS EST Water

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As an ideal membrane for wastewater treatment, desirable separation performance, and fouling resistance are both requisite. Herein we directly in situ attached Ag based nanoparticles on the surface of thin-film composite polyamide (TFC PA) membranes by using benzenediamine (BDA) derivatives with acid functional groups as one aqueous monomer mixed with m-phenylenediamine (MPD) for interfacial polymerization (IP). The acid functional groups in BDA derivatives incorporated in the PA layer facilitated the in situ metallization or mineralization without grafting additional “bridge” linkers. Various characterization techniques were employed to elucidate the modification mechanism. The effects of molecular structures of BDA derivatives on the surface properties, separation performance, and antifouling capacity of resulting membranes were also systematically investigated. Compared with the pristine TFC membrane, the modified membranes exhibited the 85.83% water flux enhancement and 65.25% lower reverse salt flux overcoming the permeability-selectivity trade-off. Moreover, the total Ag loading of modified membranes increases by 8–14 times as compared to that of the pristine one, thereby the enhanced antibacterial and antifouling capacities in wastewater treatment.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Thin-Film Composite Polyamide Membranes with In Situ Attached Ag Nanoparticles for Fouling-Mitigated Wastewater Treatment

Tian

Liu

et al. 2021

ACS EST Water

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“…Polyamide TFC membranes have been regarded as the gold standard for membrane desalination. [48][49][50] This kind of membranes is typically formed by IP at the interface between m-phenylene diamine/PIP aqueous solution and TMC hexane-organic solution. Besides polyester membranes, polyamide membranes were further prepared by PIP coating and TMC-vapor deposition to present the versatility of vaporphase polymerization.…”

Section: Fabrication and Desalination Performance Of Polyamide Tfc Membranesmentioning

confidence: 99%

Vapor‐phase polymerization of high‐performance thin‐film composite membranes for nanofiltration

Yang

et al. 2021

AIChE Journal

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Thin-film composite (TFC) membranes are commendable semipermeable barriers for water treatment. Although conventionally immiscible interfaces between aqueous and organic solutions are widely utilized for obtaining TFC membranes, interfacial polymerization still suffers from the issues of harmful solvents, complex diffusion/ reaction of the reactants, and thermodynamic and kinetic instability of interfaces. In this study, vapor-phase polymerization with no requirements for organic solvent and immiscible interface is utilized for processing TFC nanofiltration membranes. Through cross-linking of β-cyclodextrin and piperazine layers by trimesoyl chloride vapor, polyester and polyamide TFC membranes with high cross-linking degree are simply prepared in a scalable and reproducible manner. The prepared TFC membranes exhibit stable nanofiltration and desalination performance for all water, organic solvent, and water-organic mixture systems, with permeance up to an order of magnitude higher than that of commercial membranes.

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“…[4][5][6] Interfacial polymerization (IP) is powerful to form an ultrathin (~100 nm) permselective film at heterogeneous water/oil interface, which has been demonstrated in the large-scale manufacture of nanofiltration (NF) and reverse osmosis membranes for water treatment, purification of high value-added products, etc. [7][8][9][10] IP is a rapid (~seconds) reaction process, whose kinetics are challenging to be controlled. 11,12 In a typical NF membrane formation process, amines diffuse from the water inside the porous substrate into the oil phase and polycondensate with acyl chlorides, forming a polyamide network.…”

Section: Introductionmentioning

confidence: 99%

Solvation‐amination‐synergy that neutralizes interfacially polymerized membranes for ultrahigh selective nanofiltration

Tang

Liu

et al. 2022

AIChE Journal

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Molecular desalination is broadly used in chemical, food, and textile industries, which needs efficient and anti‐fouling separation technologies to reach this goal. Interfacial polymerization is one of the most promising routes to construct ultrahigh selective nanofiltration membranes. However, the irreversible hydrolysis of residual acyl chlorides makes Donnan charges of nascent films distribute unevenly which hinders fine molecular desalination and anti‐fouling. Here, we propose a pioneering solvation‐amination‐synergy strategy to synchronously inhibit the hydrolysis of residual acyl chlorides and promote their amination. The electroneutral nanofiltration membrane with high water permeance (13.2 L m−2 h−1 bar−1) is quantitatively fabricated that has superb anti‐fouling abilities and minimizes Donnan impacts on competitive ion penetrations, so it transmits Na2SO4 and NaCl while fully obstructs cationic or anionic dyes (< 500 Da). The ultrahigh molecule to ion selectivities outperform state‐of‐art nanofiltration membranes, which may provide a paradigm shift for scalable membrane fabrication for various industrial product desalination.

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Breaking through permeability–selectivity trade‐off of thin‐film composite membranes assisted with crown ethers

Cited by 20 publications

References 57 publications

Thin-Film Composite Polyamide Membranes with In Situ Attached Ag Nanoparticles for Fouling-Mitigated Wastewater Treatment

Thin-Film Composite Polyamide Membranes with In Situ Attached Ag Nanoparticles for Fouling-Mitigated Wastewater Treatment

Vapor‐phase polymerization of high‐performance thin‐film composite membranes for nanofiltration

Solvation‐amination‐synergy that neutralizes interfacially polymerized membranes for ultrahigh selective nanofiltration

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