Preparation of positively charged nanofiltration membranes: Manipulation of the positive charge

Desalination, Год журнала: 2024, Номер 586, С. 117780 - 117780

Опубликована: Май 24, 2024

Язык: Английский

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Facile construction of a tight polypeptide-based composite ultrafiltration membrane with antimicrobial activity for sustainable treatment of highly saline organic wastewater

Journal of Membrane Science, Год журнала: 2025, Номер unknown, С. 123796 - 123796

Опубликована: Фев. 1, 2025

Язык: Английский

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Combining the bridging effect of tannic acid and solution activation for improving the lithium/magnesium separation performance of nanofiltration membrane

Desalination, Год журнала: 2025, Номер unknown, С. 118658 - 118658

Опубликована: Фев. 1, 2025

Язык: Английский

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Positively Charged Polyamine Nanofiltration Membrane for Precise Ion–Ion Separation

ACS Applied Materials & Interfaces, Год журнала: 2023, Номер 15(41), С. 48695 - 48704

Опубликована: Окт. 5, 2023

Positively charged nanofiltration (NF) membranes offer enormous potential for lithium-magnesium separation, hard water softening, and heavy metal removal. However, fundamental performance limitations these applications exist in conventional polyamide-based NF due to the negatively surface low ion-ion selectivity. We hereby innovatively develop an advanced positively polyamine-based membrane built by nucleophilic substitution of bromine amine groups precise separation. Specifically, polyethylenimine (PEI) 1,3,5-tris(bromomethyl)benzene (TBB) are interfacially polymerized generate amine-linked PEI-TBB selective layer with ultrathin thickness ∼95 nm, effective pore size 6.5 Å, a strong zeta +20.9 mV at pH 7. The composite achieves permeance 4.2 L·m-2·h-1·bar-1, various divalent salt rejections above 90%, separation factors 15 NaCl/MgCl2 LiCl/MgCl2 mixed solutions. A three-stage process is implemented achieve Mg2+/Li+ mass ratio sharply decreasing from 50 0.11 total factor (SLi,Mg) 455. Furthermore, exhibits excellent operational stability under continuous filtration high pressure, demonstrating great application

Язык: Английский

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Charge‐Sign‐Independent Separation of Mono‐ and Divalent Ions With Nanofiltration Membranes

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 12, 2024

Abstract Achieving precise selective separation of monovalent and divalent cations, as well anions, is vital yet challenging in practical applications involving complex component treatments. Current membranes are typically effective for separating either cation pairs or anion pairs. To address this issue, a straightforward strategy fabricating nanofiltration (NF) membrane developed that selectively permeates ions. This study focused on neutralizing the surface charge tuning pore size distribution polyamide through secondary interfacial polymerization using zwitterionic copolymer consisting 2‐methacryloyloxyethyl phosphorylcholine 2‐aminoethyl methacrylate hydrochloride. The optimized NF prepared study, with near‐neutrally charged appropriate distribution, demonstrates favorable performance precisely ions, irrespective ion sign. optimum features high selectivity both Cl − /SO 4 2− (93) Li + /Mg 2+ (67) pairs, along water permeance 8.5 L m −2 h −1 bar , making it competitive many reported membranes. offers new insights into ion‐selective mechanisms monovalent/divalent ions may guide development advanced single‐solute selectivity.

Язык: Английский

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

ACS ES&T Engineering, Год журнала: 2024, Номер 4(5), С. 1113 - 1122

Опубликована: Фев. 7, 2024

Reducing the membrane surface negative charge density and properly enlarging pore size could benefit selective efficient separation of divalent cations from monovalent desired by many applications (e.g., Li+/Mg2+ separation) using nanofiltration (NF) synergistically exploiting Donnan steric effects. This study provides a one-step tactic for preparation such membranes simply introducing small percentage sulfuryl chloride (SO2Cl2) into organic phase trimesoyl (TMC). method is adaptable to classical interfacial polymerization (IP) technique. The key conditions include sufficient high concentration piperazine (PIP) in aqueous 2.0 wt %) low-to-medium ratio TMC. An as-prepared membrane, which manifested selectivity 22.2, exhibited rejection MgCl2 at 92%, low Na2SO4 34%, relatively water permeance 11.1 L m–2 h–1 bar–1. We propose that monomers mainly played an interferential role rather than largely being incorporated polyamide matrix. was demonstrated very sulfur element composition active layer substantially enlarged comparison control membrane. Adding allow more PIP diffuse through structure superficial leaving unreacted amine groups endowed with positive charges. Moreover, addition greatly change structural morphologies, turn roughness, increasing number large ring-like structures and/or rougher nodules cover almost entire surface. Therefore, this work fabricated novel approach have practical cation separation.

Язык: Английский

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Asymmetric polyamide nanofilm boosted by protonated dendrimer porous intermediate layer for Li+/Mg2+ separation

Journal of Membrane Science, Год журнала: 2024, Номер 701, С. 122743 - 122743

Опубликована: Апрель 12, 2024

Язык: Английский

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The decontaminant mechanism of polyamide membranes for sulfamethoxazole: The insights from combined machine learning and molecular modelling

Chemical Engineering Science, Год журнала: 2025, Номер unknown, С. 121293 - 121293

Опубликована: Янв. 1, 2025

Язык: Английский

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Positively charged thin-film nanocomposite membrane doped with functionalized covalent organic frameworks nanosphere for heavy metal ion removal

Separation and Purification Technology, Год журнала: 2025, Номер 363, С. 131996 - 131996

Опубликована: Фев. 7, 2025

Язык: Английский

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Positively charged nanofiltration membranes with gradient structures for enhancing separation properties

Desalination, Год журнала: 2024, Номер 584, С. 117750 - 117750

Опубликована: Май 17, 2024

Язык: Английский

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