Positively-charged nanofiltration membrane formed by quaternization and cross-linking of blend PVC/P(DMA-co-MMA) precursors

Cui, Yue; Yao, Zhikan; Zheng, Ke; Du, Shi-Yuan; Zhu, Bao‐Ku; Zhu, Liping; Du, Chun‐Hui

doi:10.1016/j.memsci.2015.05.019

Cited by 59 publications

(11 citation statements)

References 35 publications

(39 reference statements)

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“…In terms of PA integrity, grafting of amine functionalities caused peaks dissociations within the C1s main peak, which are attributed to changes across the amide bonds present across the nascent PA. (Figure S6 ). The peak at 285.98 eV corresponding to C-N sites, across the PA, was significantly decreased after grafting, indicating consequent damage or reconfiguration of the PA structure 16 , 19 . Peaks appeared at around 291 eV, corresponding to π-π* - shake-up transitions of aromatic structures.…”

Section: Resultsmentioning

confidence: 99%

Charge tunable thin-film composite membranes by gamma-ray triggered surface polymerization

Reis

Duke

Tardy

et al. 2017

Sci Rep

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Thin-film composite poly(amide) (PA) membranes have greatly diversified water supplies and food products. However, users would benefit from a control of the electrostatic interactions between the liquid and the net surface charge interface in order to benefit wider application. The ionic selectivity of the 100 nm PA semi-permeable layer is significantly affected by the pH of the solution. In this work, for the first time, a convenient route is presented to configure the surface charge of PA membranes by gamma ray induced surface grafting. This rapid and up-scalable method offers a versatile route for surface grafting by adjusting the irradiation total dose and the monomer concentration. Specifically, thin coatings obtained at low irradiation doses between 1 and 10 kGy and at low monomer concentration of 1 v/v% in methanol/water (1:1) solutions, dramatically altered the net surface charge of the pristine membranes from −25 mV to +45 mV, whilst the isoelectric point of the materials shifted from pH 3 to pH 7. This modification resulted in an improved water flux by over 55%, from 45.9 to up 70 L.m−2.h−1, whilst NaCl rejection was found to drop by only 1% compared to pristine membranes.

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Section: Resultsmentioning

confidence: 99%

Charge tunable thin-film composite membranes by gamma-ray triggered surface polymerization

Reis

Duke

Tardy

et al. 2017

Sci Rep

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“…(2016) [1][2][3][4][5][6] www.deswater.com doi: 10.1080/19443994.2016.1189852 nanocomposite membranes are also prepared via interfacial polymerization process while nanoparticles are incorporated in the polyamide dense layer to increase the hydrophilicity or surface charge density without sacrificing the separation efficiency of the composite membrane [5]. Electrochemical processing is an important part of the membrane industry.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

“…In order to improve the performance of the nanofiltration membrane, a lot of efforts were made by changing the surface architectures and hydrophilicity. Membranes with different surface charge and polymer are prepared with interfacial polymerization or dip-coating methods [3,4]. Thin film *Corresponding author.…”

Section: Introductionmentioning

confidence: 99%

Effect of electric field intensity on the performance of poly(piperazine amide) nanofiltration membranes

Han

Zhang

Jian

2016

Desalination and Water Treatment

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A B S T R A C TNanofiltration membrane has high flux and rejection to inorganic salts at relative low operation pressure, which is widely used in desalination and wastewater treatment. Negatively charged nanofiltration membrane prepared with interfacial polymerization method has high rejection to anion with high valence because of Donnan effect. In this work, negatively charged poly(piperazine amide) nanofiltration membranes with different rejections were used in separation of salt solution and low voltage direct current (LVDC) electric field was involved to increase the surface electric charge density to improve the membrane rejections to inorganic salts. When the forward electric field intensity was increased from 0 to 16 V/cm, the membrane rejections were all increased. The rejection to Na 2 SO 4 of membrane (NO2) increased from 68 to 93%, while the membrane flux did not change obviously. At the same time, when the forward electric intensity is elevated, the membranes with low rejections show obvious elevation of permselectivity while the membranes with high rejections have limited elevation of performance. When reversed electric field was applied, the rejection to Na 2 SO 4 of membrane (NO5) was decreased from 68 to 36%, while the flux changed little. It was demonstrated that the applied LVDC electric field can affect the surface charge density and change the permselectivity of negatively charged nanofiltration membranes, which is meaningful in desalination.

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“…Mahendran, et al 20 prepared a positively charged NF membrane from aminated polysulfone (APSF) via a two-step phase inversion method, the resultant membrane showed the highest rejection (R) of 99.5% to 500 ppm CrCl 3 solution. Cui, et al 21 fabricated another novel kind of positively charged NF membrane by utilizing quaternization and cross-linking reaction between p-xylylene dichloride (XDC) and tertiary amine units in PVC/PMMA-co-DMA precursor membranes. The resultant membrane exhibited 89.1% rejection to 2000 ppm MgCl 2 solution.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of a novel positively charged composite hollow fiber nanofiltration membrane based on chitosan lactate

Miao

Chen

et al. 2019

RSC Adv.

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Positively-charged nanofiltration membrane formed by quaternization and cross-linking of blend PVC/P(DMA-co-MMA) precursors

Cited by 59 publications

References 35 publications

Charge tunable thin-film composite membranes by gamma-ray triggered surface polymerization

Charge tunable thin-film composite membranes by gamma-ray triggered surface polymerization

Effect of electric field intensity on the performance of poly(piperazine amide) nanofiltration membranes

Preparation and characterization of a novel positively charged composite hollow fiber nanofiltration membrane based on chitosan lactate

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