Accurately controlling the hierarchical nanostructure of polyamide membranes via electrostatic atomization-assisted interfacial polymerization

2020 ◽  
Vol 8 (18) ◽  
pp. 9160-9167 ◽  
Author(s):  
Jingjing Chen ◽  
Jie Zhang ◽  
Xiaoli Wu ◽  
Xulin Cui ◽  
Wenpeng Li ◽  
...  
Keyword(s):  
Interfacial Polymerization ◽  
Hierarchical Nanostructure ◽  
Electrostatic Atomization ◽  
Solvent Permeation ◽  
Polyamide Membranes

Polyamide membranes with an accurately controlled hierarchical nanostructure permit ultrafast solvent permeation and efficient solute rejection.

scholarly journals Ionization behavior of nanoporous polyamide membranes

2020 ◽  
Vol 117 (48) ◽  
pp. 30191-30200
Author(s):  
Cody L. Ritt ◽  
Jay R. Werber ◽  
Mengyi Wang ◽  
Zhongyue Yang ◽  
Yumeng Zhao ◽  
...  
Keyword(s):  
High Performance ◽  
Interfacial Polymerization ◽  
Carboxyl Groups ◽  
Structure Property ◽  
Nanoconfined Water ◽  
Fundamental Understanding ◽  
Ionization Behavior ◽  
Water Salt ◽  
Low Permittivity ◽  
Polyamide Membranes

Escalating global water scarcity necessitates high-performance desalination membranes, for which fundamental understanding of structure–property–performance relationships is required. In this study, we comprehensively assess the ionization behavior of nanoporous polyamide selective layers in state-of-the-art nanofiltration (NF) membranes. In these films, residual carboxylic acids and amines influence permeability and selectivity by imparting hydrophilicity and ionizable moieties that can exclude coions. We utilize layered interfacial polymerization to prepare physically and chemically similar selective layers of controlled thickness. We then demonstrate location-dependent ionization of carboxyl groups in NF polyamide films. Specifically, only surface carboxyl groups ionize under neutral pH, whereas interior carboxyl ionization requires pH >9. Conversely, amine ionization behaves invariably across the film. First-principles simulations reveal that the low permittivity of nanoconfined water drives the anomalous carboxyl ionization behavior. Furthermore, we report that interior carboxyl ionization could improve the water–salt permselectivity of NF membranes over fourfold, suggesting that interior charge density could be an important tool to enhance the selectivity of polyamide membranes. Our findings highlight the influence of nanoconfinement on membrane transport properties and provide enhanced fundamental understanding of ionization that could enable novel membrane design.

Nanofibrous hydrogel composite membranes with ultrafast transport performance for molecular separation in organic solvents

2019 ◽  
Vol 7 (33) ◽  
pp. 19269-19279 ◽  
Author(s):  
Yi Li ◽  
Eric Wong ◽  
Alexander Volodine ◽  
Chris Van Haesendonck ◽  
Kaisong Zhang ◽  
...  
Keyword(s):  
Organic Solvents ◽  
Interfacial Polymerization ◽  
Composite Membranes ◽  
Hydrogel Composite ◽  
Molecular Separation ◽  
Solvent Permeation

A polyamide (PA) nanofilm was successfully fabricated on the nanofibrous hydrogel support via controlled interfacial polymerization (IP) and exhibited an unprecedented solvent permeation for various organic solvents.

On the salt rejection properties of nanofiltration polyamide membranes formed by interfacial polymerization

2011 ◽  
Vol 379 (1-2) ◽  
pp. 215-223 ◽  
Author(s):  
Haochen Zhu ◽  
Anthony Szymczyk ◽  
Béatrice Balannec
Keyword(s):  
Interfacial Polymerization ◽  
Salt Rejection ◽  
Polyamide Membranes

Crumple-textured polyamide membranes via MXene nanosheet-regulated interfacial polymerization for enhanced nanofiltration performance

2021 ◽  
pp. 119536
Author(s):  
Xuewu Zhu ◽  
Xinyu Zhang ◽  
Jinyu Li ◽  
Xinsheng Luo ◽  
Daliang Xu ◽  
...  
Keyword(s):  
Interfacial Polymerization ◽  
Polyamide Membranes

scholarly journals Thin film composite polyamide membranes: parametric study on the influence of synthesis conditions

RSC Advances ◽  
2015 ◽  
Vol 5 (68) ◽  
pp. 54985-54997 ◽  
Author(s):  
B. Khorshidi ◽  
T. Thundat ◽  
B. A. Fleck ◽  
M. Sadrzadeh
Keyword(s):  
Thin Film ◽  
Strong Interaction ◽  
Parametric Study ◽  
Interfacial Polymerization ◽  
Polymerization Reaction ◽  
Film Composite ◽  
Synthesis Conditions ◽  
Thin Film Composite ◽  
Wide Range ◽  
Polyamide Membranes

Analysis of strong interaction between monomers concentrations in interfacial polymerization reaction provides valuable guidelines for making a wide range of salt rejecting membranes.

High-performance thin-film composite polyamide membranes developed with green ultrasound-assisted interfacial polymerization

2019 ◽  
Vol 570-571 ◽  
pp. 112-119 ◽  
Author(s):  
Liang Shen ◽  
Wei-song Hung ◽  
Jian Zuo ◽  
Xuan Zhang ◽  
Juin-Yih Lai ◽  
...  
Keyword(s):  
Thin Film ◽  
High Performance ◽  
Interfacial Polymerization ◽  
Film Composite ◽  
Thin Film Composite ◽  
Ultrasound Assisted ◽  
Polyamide Membranes
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