Superamphiphilic zwitterionic block copolymer surfactant-assisted fabrication of polyamide thin-film composite membrane with highly enhanced desalination performance

Jung, Ki Hwan; Kim, Hee Joong; Kim, Mun Hyeon; Seo, Huiran; Lee, Jong-Chan

doi:10.1016/j.memsci.2020.118677

Cited by 26 publications

(5 citation statements)

References 55 publications

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“…The PEG removal rate was determined according to the total organic carbon contents of the permeate and feed solutions, and the dissolved organic carbon content was obtained using a total organic carbon analyzer (Multi N/C 2100, Analytikjena). The PSD was calculated according to the PEG rejection rates as follows: where σ p , d p , and μ p are the geometric standard deviation, Stokes diameter (nm), and mean pore radius (nm) of the PEG molecules, respectively.…”

Section: Materials and Methodsmentioning

confidence: 99%

Nanofiltration Membranes with Octopus Arm-Sucker Surface Morphology: Filtration Performance and Mechanism Investigation

Wang

Zhu

Cheng

et al. 2021

Environ. Sci. Technol.

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Precisely tailoring the surface morphology characteristics of the active layers based on bionic inspirations can improve the performance of thin-film composite (TFC) membranes. The remarkable water adsorption and capture abilities of octopus tentacles inspired the construction of a novel TFC nanofiltration (NF) membrane with octopus arm-sucker morphology using carbon nanotubes (CNTs) and beta-cyclodextrin (β-CD) during interfacial polymerization (IP). The surface morphology, chemical elements, water contact angle (WCA), interfacial free energy (ΔG), electronegativity, and pore size of the membranes were systematically investigated. The optimal membrane exhibited an enhanced water permeance of 22.6 L•m −2 •h −1 • bar −1 , 180% better than that of the TFC-control membrane. In addition, the optimal membrane showed improved single salt rejections and monovalent/divalent ion selectivity and can break the trade-off effect. The antiscaling performance and stability of the membranes were further explored. The construction mechanism of the octopus arm-sucker structure was excavated, in which CNTs and β-CD acted as arm skeletons and suckers, respectively. Furthermore, the customization of the membrane surface and performance was achieved through tuning the individual effects of the arm skeletons and suckers. This study highlights the noteworthy potential of the design and construction of the surface morphology of high-performance NF membranes for environmental application.

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Section: Materials and Methodsmentioning

confidence: 99%

Nanofiltration Membranes with Octopus Arm-Sucker Surface Morphology: Filtration Performance and Mechanism Investigation

Wang

Zhu

Cheng

et al. 2021

Environ. Sci. Technol.

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“…Traditional linear polymers do not have branch points and their molecular chains are easy to entangle, the viscosity of the system increases rapidly with the increase in relative molecular weight, the stability of self-assembled micelles is poor, and they are easy to disassemble after intravenous injection because the concentration is below the critical micelle concentration (CMC), resulting in the early release of encapsulated drugs, which great limits their functional application. Topological polymers, including but not limited to linear block, 32,33 star-shaped, 34 dendritic 35 and brush structures, 36 have more precise structures, a lower viscosity, and smaller size (such as dendrimers), for which it is easy to achieve cell internalization and they can be used as drug-delivery carriers. In addition, their abundant terminal functional groups increase the active sites, making it easy to achieve targeting.…”

Section: Zwitterionic-based Topological Polymersmentioning

confidence: 99%

Recent advances of zwitterionic-based topological polymers for biomedical applications

Zhang

Xie

et al. 2022

J. Mater. Chem. B

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“…In the literature, various approaches were adopted for preparing positively charged NF membranes, which included using aqueous monomers/oligomers with more amine groups such as polyethylenimine (PEI), ,, using special organic solvents such as toluene for TMC, and adding surfactants into either the aqueous or the organic phase. − The latter two approaches deliberately vary the diffusion rate of aqueous monomers into the organic phase, which normally is the rate-controlling step for IP reactions. The lowered diffusion rate, in turn, would probably affect the reaction behaviors between the monomers in the reaction zones.…”

Section: Introductionmentioning

confidence: 99%

Simultaneously Modulating Nanofiltration Membrane Surface Charges and Pore Size in Pursuit of Effective Cation Separation via a Bi-Functional Monomers-Interfered IP Reaction

Wang,

Gao,

Zhang

et al. 2024

ACS EST Eng.

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Reducing the membrane surface negative charge density and properly enlarging the pore size could benefit the selective and efficient separation of divalent cations from monovalent cations desired by many applications (e.g., Li + /Mg 2+ separation) using nanofiltration (NF) by synergistically exploiting the Donnan and steric effects. This study provides a one-step tactic for the preparation of such membranes by simply introducing a small percentage of sulfuryl chloride (SO 2 Cl 2 ) into the organic phase of trimesoyl chloride (TMC). This method is adaptable to the classical interfacial polymerization (IP) technique. The key conditions include a sufficient high concentration of piperazine (PIP) in the aqueous phase (e.g., 2.0 wt %) and a low-to-medium concentration ratio of sulfuryl chloride to TMC. An as-prepared membrane, which manifested a high Li + / Mg 2+ selectivity of 22.2, exhibited a high rejection of MgCl 2 at 92%, a low rejection of Na 2 SO 4 at 34%, and a relatively high water permeance of 11.1 L m −2 h −1 bar −1 . We propose that the sulfuryl chloride monomers mainly played an interferential role rather than largely being incorporated into the polyamide matrix. This was demonstrated by the very low sulfur element composition in the active layer and the substantially enlarged membrane pore size in comparison to that of the control membrane. Adding sulfuryl chloride into the organic phase could allow more PIP monomers to diffuse through the enlarged structure to the superficial surface of the membrane, leaving more unreacted amine groups endowed with positive charges. Moreover, the addition of sulfuryl chloride could greatly change the membrane surface and structural morphologies, and in turn the surface roughness, by increasing the number of large ring-like structures and/or rougher nodules that could cover almost the entire membrane surface. Therefore, this work demonstrated that the membranes fabricated by the novel approach could have practical applications for cation separation.

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Superamphiphilic zwitterionic block copolymer surfactant-assisted fabrication of polyamide thin-film composite membrane with highly enhanced desalination performance

Cited by 26 publications

References 55 publications

Nanofiltration Membranes with Octopus Arm-Sucker Surface Morphology: Filtration Performance and Mechanism Investigation

Nanofiltration Membranes with Octopus Arm-Sucker Surface Morphology: Filtration Performance and Mechanism Investigation

Recent advances of zwitterionic-based topological polymers for biomedical applications

Simultaneously Modulating Nanofiltration Membrane Surface Charges and Pore Size in Pursuit of Effective Cation Separation via a Bi-Functional Monomers-Interfered IP Reaction

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