One-step constructed ultrathin Janus polyamide nanofilms with opposite charges for highly efficient nanofiltration

Liu, Sihua; Wu, Chunrui; Hung, Wei‐Song; Lu, Xiaolong; Lee, Kueir‐Rarn

doi:10.1039/c7ta07582k

Cited by 123 publications

(44 citation statements)

References 45 publications

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“…That is, negatively charged nanofiltration membranes show relatively high rejection of divalent anions, while positively charged ones are preferred to reject divalent cations. A Janus nanofiltration membrane with asymmetric surface charges demonstrated high rejection of both divalent cations and anions due to the dual electrostatic repulsion (Figure e,f) . These results indicate that separated charged layers or surfaces behave uniquely compared to a charge‐mixed film, such as layer‐by‐layer assembled polyelectrolyte multilayers.…”

Section: Promote Energy Efficiency By Asymmetrymentioning

confidence: 86%

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Janus Membranes: Creating Asymmetry for Energy Efficiency

et al. 2018

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Membranes are recognized as a key component in many environment and energy-related applications, but conventional membranes are challenged to satisfy the growing demand for ever more energy-efficient processes. Janus membranes, a novel class with asymmetric properties on each side, have recently emerged and represent enticing opportunities to address this challenge. With an inner driving force arising from their asymmetric configuration, Janus membranes are appealing for enhancing energy efficiency in a variety of membrane processes by promoting the desired transport. Here, the fundamental principles to prepare Janus membranes with asymmetric surface wettability and charges are summarized, and how they work in conventional and unconventional membrane processes is demonstrated.

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Section: Promote Energy Efficiency By Asymmetrymentioning

confidence: 86%

Section: Promote Energy Efficiency By Asymmetrymentioning

confidence: 98%

Janus Membranes: Creating Asymmetry for Energy Efficiency

et al. 2018

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“…Meanwhile, a part of acyl chloride groups in the PEI-TMC membrane are hydrolyzed to carboxylate groups after DAIB modification ( Figure S5, Supporting Information), which also contributes to the improved hydrophilicity. [41] Molecular weight cut-off of PEI-TMC and DAIB membranes are 447 and 672 Da, respectively. Correspondingly, mean pore size of DAIB membrane (0.4 nm) is slightly larger than that of PEI-TMC membrane (0.3 nm, Figure S10, Supporting Information).…”

Section: Membrane Preparation and Characterizationsmentioning

confidence: 99%

A Nano‐Heterogeneous Membrane for Efficient Separation of Lithium from High Magnesium/Lithium Ratio Brine

Peng

Zhen

2021

Adv Funct Materials

192

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Lithium extraction from salt lake brines is highly demanded to circumvent the lithium supply shortage. However, polymer nanofiltration membranes suffer from low lithium permeability while nanofluidic devices are hindered by complicated preparation and miniaturized scales despite high permeability. Here, the authors report a facile strategy to prepare positively charged nanofiltration membranes for ultrapermeable and selective separation of lithium ions from concentrated magnesium/lithium mixtures. A new electrolyte monomer (diaminoethimidazole bromide, DAIB) containing bidentate amine groups is designed to modify pristine polyamide composite membranes. Structure characterizations and simulations show that the DAIB modification brings about nano-heterogeneity that not only improves surface hydrophilicity, but also reduces water transport resistance through the ≈100 nm thick separation layer. Water permeance of the modified membrane improves fivefold and is coupled with good stability in 200-h continuous nanofiltration. It exhibits high lithium flux (0.7 mol m −2 h −1) for brines (Mg 2+ /Li + ratio 20) at 6 bar operation pressure.

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“…Membrane modules (Fig. S1a) were prepared according to our previous study [26] water was produced by a water purification system (RO50-1, Qlife, China).…”

Section: Chemicals and Materialsmentioning

confidence: 99%

Understanding the chlorination mechanism and the chlorine-induced separation performance evolution of polypiperazine-amide nanofiltration membrane

Liu

Hou

et al. 2019

Journal of Membrane Science

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One-step constructed ultrathin Janus polyamide nanofilms with opposite charges for highly efficient nanofiltration

Abstract: An ultrathin Janus polyamide separating layer with opposite charges was successfully prepared through the “self-regulation” process of low temperature interfacial polymerization.

Cited by 123 publications

References 45 publications

Janus Membranes: Creating Asymmetry for Energy Efficiency

Janus Membranes: Creating Asymmetry for Energy Efficiency

A Nano‐Heterogeneous Membrane for Efficient Separation of Lithium from High Magnesium/Lithium Ratio Brine

Understanding the chlorination mechanism and the chlorine-induced separation performance evolution of polypiperazine-amide nanofiltration membrane

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