Ionic <scp>liquid‐induced</scp> deep grafting of polyelectrolyte to reform polyamide layer for antifouling nanofiltration membrane

Liu, Lulu; Liu, Yuxuan; Wan, Yinhua; Song, Weijie; Lu, Hongwei; Luo, Jianquan

doi:10.1002/aic.18204

Cited by 10 publications

(2 citation statements)

References 48 publications

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“…The increase in separation layer densification led to a decrease in membrane permeance and an increase in rejection when the IP time was increased from 1 to 7 min. However, the formed polyamide could be swelled by the ILs and methanol solvent as the IP time increases, − which can lead to the formation of a looser PA structure. This is known as a defect-generation process, which would increase the water permeance and decrease the rejection.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Oligoaniline-Based Electrically Responsive Polyamide Membranes for High-Performance Molecular Nanofiltration

Xiao,

Bai,

Chen

et al. 2024

Ind. Eng. Chem. Res.

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Smart responsive nanofiltration (NF) membranes generated widespread interest for their ability to dynamically regulate permselectivity during operation according to the requirements of the separation. However, the reported smart membranes were usually impeded by limited stability as the problem of compatibility between conductive materials and a polymer membrane. Herein, we report a high-performance electrically responsive polyamide (PA) membrane for molecular NF by introducing an oligoaniline of amino-capped aniline trimer (AT) involved in the formation of a PA membrane. The membranes were prepared via interfacial polymerization (IP) of AT and trimesoyl chloride (TMC) on a porous substrate. The influence of AT, TMC, and dopant of the AT concentration on the membrane performance was systematically investigated. The results demonstrate that the introduction of AT significantly enhances the molecular separation performance of the membranes. The fabricated membranes exhibit excellent rejection toward small organic molecules while maintaining high water permeance and excellent long-term stability. Moreover, the membranes show remarkable electrocyclic responsiveness, allowing for effective control of the rejection rate by applying an external electric field. The improved performance of the membranes is attributed to the unique electrical and structural properties of AT doping by ionic liquids. Our findings provide valuable insights for the development of high-performance molecular nanofiltration membranes.

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Section: Resultsmentioning

confidence: 99%

Fabrication of Oligoaniline-Based Electrically Responsive Polyamide Membranes for High-Performance Molecular Nanofiltration

Xiao,

Bai,

Chen

et al. 2024

Ind. Eng. Chem. Res.

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“…Membrane has been widely used in water treatment 1–3 . To ensure stable and continuous production in membrane separation processes, exceptional anti‐fouling properties and self‐cleaning capabilities of membrane modules are essential 4 .…”

Section: Introductionmentioning

confidence: 99%

Coral‐tentacle‐inspired antifouling membrane spacer: A natural solution for biofouling prevention

Huang,

Lu,

Chen

et al. 2024

AIChE Journal

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Fouling of membrane spacers leads to increased pressure drop and reduced lifespan of membrane modules. Cleaning these fouled spacers is challenging due to strong foulant‐membrane spacer interactions. To address this issue, we introduce a novel spacer, PP‐N‐F, inspired by coral's antifouling properties. This spacer features on‐demand antifouling capabilities through a sequential growth process of functional polymer brushes on its surface. It not only possesses lower surface free energy characteristics than polypropylene spacers, but also exhibits controllable morphological changes similar to swaying coral tentacles. Temperature control strengthens the interfacial hydration layer, mitigating the trade‐off between anti‐adsorption and hydrophobicity of fluorinated surface. The temperature‐responsive surface changes enhance foulant desorption efficiency. Compared to a commercial spacer, PP‐N‐F shows an 89.3% reduction in foulant adsorption and a 61.7% decrease in pressure drop increment after 48 h cross‐flow filtration experiments. This work provides valuable insights for advanced anti‐fouling membrane module design.

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A Nanofiltration Membrane Preparation Process Based on Polyethyleneimine Diffusion Modulation and Surface Modification

Gu,

Wang,

Fang

et al. 2024

J of Applied Polymer Sci

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Nanofiltration (NF) membranes play a huge role in industrial manufacturing with their unique selective permeability. Membrane material and structure are the main factors affecting the effectiveness of NF separation. Typically, NF membranes are produced by interfacial polymerization (IP). Therefore, control of the IP process is particularly important. This work provides a NF membrane preparation process by combining internal modulation of the separation layer and surface modification. The diffusion of polyethyleneimine (PEI) molecules is accelerated by the introduction of ethanol and cetyltrimethylammonium bromide into the PEI aqueous phase solution, resulting in the formation of a loose interior. In addition, the high selectivity is maintained by high molecular weight PEI modifying. After optimizing the process, the NF membrane permeate flux and selectivity can be increased compared to the blank group (MgCl2 desalination from 90% to 97%, permeate flux from 17 to 35 L m−2 h−1). The resulting PEI/TMC NF membranes also show excellent separation properties in mixed salt applications for magnesium‐lithium separation.

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Ionic liquid‐induced deep grafting of polyelectrolyte to reform polyamide layer for antifouling nanofiltration membrane

Cited by 10 publications

References 48 publications

Fabrication of Oligoaniline-Based Electrically Responsive Polyamide Membranes for High-Performance Molecular Nanofiltration

Fabrication of Oligoaniline-Based Electrically Responsive Polyamide Membranes for High-Performance Molecular Nanofiltration

Coral‐tentacle‐inspired antifouling membrane spacer: A natural solution for biofouling prevention

A Nanofiltration Membrane Preparation Process Based on Polyethyleneimine Diffusion Modulation and Surface Modification

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