Charged Nanofiltration Membrane Research Articles

Constructing positively charged hollow fiber nanofiltration membranes with high performance for the treatment of wastewater containing heavy metal ions

Constructing positively charged hollow fiber nanofiltration membranes with high performance for the treatment of wastewater containing heavy metal ions

Intercalation of carbon quantum dots into the selective layer of water softening membranes for improved performance and antifouling properties.

Intercalation of carbon quantum dots into the selective layer of water softening membranes for improved performance and antifouling properties.

Highly positively charged nanofiltration membrane through bis-quaternary ammonium modification for Li+/Mg2+ separation

Highly positively charged nanofiltration membrane through bis-quaternary ammonium modification for Li+/Mg2+ separation

Dual-functional covalent organic framework engineered negatively charged nanofiltration membrane for Li+/Mg2+ separation

Dual-functional covalent organic framework engineered negatively charged nanofiltration membrane for Li+/Mg2+ separation

Multifunctional role of surfactant in fabricating polyamide nanofiltration membranes for Li+/Mg2+ separation

Multifunctional role of surfactant in fabricating polyamide nanofiltration membranes for Li+/Mg2+ separation

Low-temperature regulated interfacial polymerization of nanofiltration membrane for efficient Li+/Mg2+ separation

Low-temperature regulated interfacial polymerization of nanofiltration membrane for efficient Li+/Mg2+ separation

Mineralized Nanofiber Substrates Enabling High-Performance Dually Charged Nanofiltration Membranes with Enhanced Permeability.

Nanofiltration membranes (NFMs) with superior permeability and high rejection of both divalent anions and cations are highly desirable to meet the increasing separation demands of complex systems. Herein, we propose a three-in-one strategy to develop a state-of-the-art dually charged thin-film composite (TFC) nanofiltration membrane consisting of a positively charged electrospun nanofiber substrate (NFS) with surface mineralization and a negatively charged polyamide (PA) selective layer prepared by interfacial polymerization (IP). The highly hydrophilic mineralized nanofiber substrate not only effectively reduces the thickness of the PA selective layer but also crumples its structures by the abundant zirconia nanoparticles on the substrate surface, resulting in excellent water flux (15.0 L m-2 h-1 bar-1) for the TFC NFMs. The relationship between the thickness of the selective layer and substrate is further investigated using dissipative particle dynamics (DPD) simulations. Meanwhile, the dually charged NFM exhibits relatively high rejection for both anions (97.1% for Na2SO4 and 97.9% for MgSO4) and cations (87.9% for MgCl2) in aqueous solutions compared with single-charged membranes, which is attributed to the dual-repulsion effect of the selective layer and the substrate surface bearing opposite charges. Moreover, the prepared NFMs exhibit good stability and excellent antifouling performance. This work may pave the way for the development of highly efficient nanofiltration membranes for the practical separation of comprehensively charged solutes.

Post-docking hydrophilic Ag-MOF-303 filled in TFC for nanofiltration of charged PhACs in water

Post-docking hydrophilic Ag-MOF-303 filled in TFC for nanofiltration of charged PhACs in water

A comparative study of antibiotic treatment by different charged nanofiltration membranes

A comparative study of antibiotic treatment by different charged nanofiltration membranes

A novel trimesoyl chloride/hyper branched polyethyleneimine/MOF (MIL-303)/P84 co-polyimide nanocomposite mixed matrix membranes with an ultra-thin surface cross linking layer for removing toxic heavy metal ions from wastewater

A novel trimesoyl chloride/hyper branched polyethyleneimine/MOF (MIL-303)/P84 co-polyimide nanocomposite mixed matrix membranes with an ultra-thin surface cross linking layer for removing toxic heavy metal ions from wastewater

Space-Confined Synthesis of Thinner Ether-Functionalized Nanofiltration Membranes with Coffee Ring Structure for Li+/Mg2+ Separation.

Positively charged nanofiltration membranes have attracted much attention in the field of lithium extraction from salt lakes due to their excellent ability to separate mono- and multi-valent cations. However, the thicker selective layer and the lower affinity for Li+ result in lower separation efficiency of the membranes. Here, PEI-P membranes with highly efficient Li+/Mg2+ separation performance are prepared by introducing highly lithophilic 4,7,10-Trioxygen-1,13-tridecanediamine (DCA) on the surface of PEI-TMC membranes using a post-modification method. Characterization and experimental results show that the utilization of the DCA-TMC crosslinked structure as a space-confined layer to inhibit the diffusion of the monomer not only increases the positive charge density of the membrane but also reduces its thickness by ≈35% and presents a unique coffee-ring structure, which ensures excellent water permeability and rejection of Mg2+. The ion-dipole interaction of the ether chains with Li+ facilitates Li+ transport and improves the Li+/Mg2+ selectivity (SLi,Mg=23.3). In a three-stage nanofiltration process for treating simulated salt lake water, the PEI-P membrane can reduce the Mg2+/Li+ ratio of the salt lake by 400-fold and produce Li2CO3 with a purity of more than 99.5%, demonstrating its potential application in lithium extraction from salt lakes.

Fabrication of charged and zwitterionic nanofiltration membranes and anti-adhesion analysis using quartz crystal microbalance with dissipation and atomic force microscopy

Fabrication of charged and zwitterionic nanofiltration membranes and anti-adhesion analysis using quartz crystal microbalance with dissipation and atomic force microscopy

Fabrication of positively charged composite nanofiltration membranes with “multilayer interlocking” structure based on ZIF-8 layer anchored constrained growth strategy for Mg2+/Li+ separation

Fabrication of positively charged composite nanofiltration membranes with “multilayer interlocking” structure based on ZIF-8 layer anchored constrained growth strategy for Mg2+/Li+ separation

Surfactant-interlayer assisted interfacial polymerization for constructing Janus nanofiltration membranes: Enhanced Li+/Mg2+ separation efficiency

Surfactant-interlayer assisted interfacial polymerization for constructing Janus nanofiltration membranes: Enhanced Li+/Mg2+ separation efficiency

Advancing drinking water safety: Facile fabrication of nanofiltration membrane for enhanced antibiotics removal and efficient water softening

Advancing drinking water safety: Facile fabrication of nanofiltration membrane for enhanced antibiotics removal and efficient water softening

Efficient Li+/Mg2+ separation nanofiltration membranes modified by amine-functionalized TiO2 nanoparticles

Efficient Li+/Mg2+ separation nanofiltration membranes modified by amine-functionalized TiO2 nanoparticles

Structure and positive charge regulation in nanofiltration membrane by novel nanomaterial g-C3N5 for efficient Li+/Mg2+ separation

Structure and positive charge regulation in nanofiltration membrane by novel nanomaterial g-C3N5 for efficient Li+/Mg2+ separation

Enhancing ion separation efficiency: Janus charged nanofiltration membrane fabricated via polyethyleneimine-manipulated interfacial polymerization

Enhancing ion separation efficiency: Janus charged nanofiltration membrane fabricated via polyethyleneimine-manipulated interfacial polymerization

Positively charged nanofiltration membranes with gradient structures for enhancing separation properties

Positively charged nanofiltration membranes with gradient structures for enhancing separation properties

Quaternary phosphonium-polyamide membranes for efficient lithium extraction from brine sources

Quaternary phosphonium-polyamide membranes for efficient lithium extraction from brine sources