A novel nanofiltration membrane inspired by an asymmetric porous membrane for selective fractionation of monovalent anions in electrodialysis

Ding, Jincheng; Yang, Shanshan; Pan, Jing; Zheng, Yu; Sotto, Arcadio; Shen, Jiangnan

doi:10.1039/c8ra05152f

Cited by 14 publications

(8 citation statements)

References 41 publications

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“…26 Due to the weak electronegativity of PDA, the electronegativity of the membrane surface was slightly lower after PDA modification. 48 As shown in Figure 6, there was an intensive peak (002) at 2θ = 14.4°on the XRD spectra of MoS 2 NFM and PDA/MoS 2 NFM, which was in accordance with the typical hexagonal structure peaks of MoS 2 (JCPDS card No. 77-1716).…”

Section: Resultssupporting

confidence: 67%

“…The polyacrylonitrile (PAN) substrate could generate carboxyl groups (−COOH) after the hydrolyzation of nitrile groups in NaOH solution, which was the main factor of the negative electricity of the HPAN surface at pH 4–10. , In Figure , it could also be observed that, compared with HPAN, the electronegativity of NFM loaded with MoS 2 was enhanced, which could be ascribed to the electronegativity of MoS 2 . Due to the weak electronegativity of PDA, the electronegativity of the membrane surface was slightly lower after PDA modification …”

Section: Resultsmentioning

confidence: 98%

“…26 Due to the weak electronegativity of PDA, the electronegativity of the membrane surface was slightly lower after PDA modification. 48…”

Section: Resultsmentioning

confidence: 99%

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Bioinspired Modification of Layer-Stacked Molybdenum Disulfide (MoS₂) Membranes for Enhanced Nanofiltration Performance

et al. 2019

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Inorganic nanofiltration membranes with high flux are urgently needed in water purification processes. Herein, polydopamine (PDA)-modified layer-stacked molybdenum disulfide (MoS 2 ) nanofiltration membranes (NFMs) were fabricated via a pressure-assisted self-assembly process. The separation performance of the as-prepared membranes with various MoS 2 loadings at different dopamine polymerization times was evaluated. The pure water permeance of PDA-modified MoS 2 NFMs, with MoS 2 loading of 0.1103 mg/cm 2 at 4 h modification, could reach 135.3 LMH/bar. The rejection toward methylene blue could reach 100% with molecular weight cutoff approximately 671 Da and a high permeability of salts. Furthermore, the resultant membrane also exhibited a satisfactory long-term stability toward dye solution and antifouling property toward bovine serum albumin. This work may give inspiration to the development of inorganic membranes with high performance, especially high pure water permeance, for water-related processes.

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Section: Resultssupporting

confidence: 67%

Section: Resultsmentioning

confidence: 98%

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Bioinspired Modification of Layer-Stacked Molybdenum Disulfide (MoS₂) Membranes for Enhanced Nanofiltration Performance

et al. 2019

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“…electrolyte, Eqs. (6) and 7are reduced to a quadratic equation the solution of which is written as (8): (8) here, P* is the differential coefficient of diffusion permeability of the membrane, which is tied to the integral coefficient of diffusion permeability P by correlation (9):…”

Section: Methods For Studying the Characteristics Of Membranesmentioning

confidence: 99%

“…UF membranes are used for the prevention of the poisoning of IEMs by large organic molecules [5,6]. NF membranes are applied instead of cationexchange [7] or cation-and anion-exchange [8] membranes. NF membranes are also used in the processes of capacitive deionization with flow-type electrodes [9].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Properties of Ultrafiltration and Nanofiltration Membranes in Solutions of Sodium and Calcium Chloride

Сарапулова

Pasechnaya

Titorova

et al. 2020

Membr. Membr. Technol.

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Ultrafiltration and nanofiltration membranes that are traditionally used in baromembrane processes have become increasingly frequently applied in electromembrane and baroelectromembrane processes. In the latter case, two driving forces, an electric field and a pressure gradient, are simultaneously used. This study presents data on the specific electrical conductivity, diffusion permeability, and transport numbers of ions as well as current-voltage characteristics and chronopotentiograms of AMN-P and OPMN-P weakly ionized nanofiltration membranes and a number of track membranes in solutions of NaCl and CaCl 2. The relationship of obtained characteristics with the structure and exchange capacity of membranes is discussed. It is shown that both nanofiltration and track membranes can exhibit a quite high selectivity towards the electrical transport of ions with a certain charge sign. Such selectivity is especially high in respect of the transport of Ca 2+ ions. In the case of an AMN-P membrane, the transport number of Ca 2+ reaches 0.98, while it is noticeably lower for Na + ions. This result correlates well with a known fact about a higher rejection coefficient of doubly charged ions in comparison with singly charged ions in baromembrane processes. Track membrane #115 is also distinguished by high selectivity in respect of cations, the transport number of sodium ions in it is close to 0.96.

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Chemistry of Polydopamine – Scope, Variation, and Limitation

2019

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Polydopamine (PDA) is a polymer easily obtained by oxidation of dopamine. It is composed of indole and dopamine units in various oxidation states and to a lesser extent of pyrroles. It adheres to all type of surfaces even under water due to its abundant catechol moieties assisted by amino groups. This property together with a widespread reactivity to nucleophiles and electrophiles allowing linkage of a variety of entities renders PDA extremely interesting for various applications in biology, biomedicine, membranes, catalysis, materials and water purification. The field of PDA is violently developing. The present review gives an overview about the chemistry and properties of PDA and its analogues with the focus on recent publications. Their widespread applications are occasionally touched. Analogues are obtained by two strategies: post‐modification of PDA and oxidative polymerization of dopamine analogues. Scope and limitations of these strategies are worked out giving impulses for future research in the field.

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A novel nanofiltration membrane inspired by an asymmetric porous membrane for selective fractionation of monovalent anions in electrodialysis

Abstract: The present study describes the synthesis of new nanofiltration membranes inspired by asymmetric porous membranes used as monovalent anion selective membranes for electro-membrane separation.

Cited by 14 publications

References 41 publications

Bioinspired Modification of Layer-Stacked Molybdenum Disulfide (MoS₂) Membranes for Enhanced Nanofiltration Performance

Bioinspired Modification of Layer-Stacked Molybdenum Disulfide (MoS₂) Membranes for Enhanced Nanofiltration Performance

Electrochemical Properties of Ultrafiltration and Nanofiltration Membranes in Solutions of Sodium and Calcium Chloride

Chemistry of Polydopamine – Scope, Variation, and Limitation

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A novel nanofiltration membrane inspired by an asymmetric porous membrane for selective fractionation of monovalent anions in electrodialysis

Abstract: The present study describes the synthesis of new nanofiltration membranes inspired by asymmetric porous membranes used as monovalent anion selective membranes for electro-membrane separation.

Cited by 14 publications

References 41 publications

Bioinspired Modification of Layer-Stacked Molybdenum Disulfide (MoS2) Membranes for Enhanced Nanofiltration Performance

Bioinspired Modification of Layer-Stacked Molybdenum Disulfide (MoS2) Membranes for Enhanced Nanofiltration Performance

Electrochemical Properties of Ultrafiltration and Nanofiltration Membranes in Solutions of Sodium and Calcium Chloride

Chemistry of Polydopamine – Scope, Variation, and Limitation

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Product

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Bioinspired Modification of Layer-Stacked Molybdenum Disulfide (MoS₂) Membranes for Enhanced Nanofiltration Performance

Bioinspired Modification of Layer-Stacked Molybdenum Disulfide (MoS₂) Membranes for Enhanced Nanofiltration Performance