Covalent organic framework-modulated interfacial polymerization for ultrathin desalination membranes

Yuan, Jinqiu; Wu, Mengyuan; Wu, Hong; Liu, Yanan; You, Xinda; Zhang, Runnan; Su, Yanlei; Yang, Hao; Shen, Jianliang; Jiang, Zhongyi

doi:10.1039/c9ta08163a

Cited by 180 publications

(98 citation statements)

References 46 publications

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“…Upper-bound line represents the level of permeability and selectivity achieved by the currently prepared membranes. In order to illustrate the superiority of the asymmetric polyamide nanofilm between permeability and selectivity, we calculated related permeability/selectivity data of different types of polyamide membranes as currently reported in the literature, such as commercial polyamide membrane (Commercial membrane) 44 , crumpled polyamide membrane (IP with crumpled structure) 16,28,32 , polyamide membrane prepared by interlayer (Interlayer-IP) 20,21,26,[45][46][47][48] , traditional IP membrane (IP) 12,28,[49][50][51][52] , and mixed matrix polyamide membranes (MMMs) 14,[53][54][55][56][57][58][59][60] , as shown in Fig. 6a, b.…”

Section: Resultsmentioning

confidence: 99%

“…The thinner polyamide dense layer aims to lower the resistance of water transport across the active layer, and thereby improve permeance. For example, employing the molecular layer-by-layer 22 , 23 , 3D printing process 24 , 25 , introducing an interlayer on ultrafiltration (UF) or microfiltration (MF) substrates 26 , 27 , or incorporating hydrophilic nanomaterials 28 during IP have all been utilized to form an ultra-thin polyamide nanofilm. The interlayer on UF support, such as inorganic nanostrand film 17 , carbon nanotube network layer 20 , 21 , 27 , 29 , covalent organic framework nanosheets 26 , and cellulose nanocrystals film 30 , can precisely control interfacial reaction and obtain a thin dense layer.…”

Section: Introductionmentioning

confidence: 99%

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Asymmetric polyamide nanofilms with highly ordered nanovoids for water purification

et al. 2020

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Tailor-made structure and morphology are critical to the highly permeable and selective polyamide membranes used for water purification. Here we report an asymmetric polyamide nanofilm having a two-layer structure, in which the lower is a spherical polyamide dendrimer porous layer, and the upper is a polyamide dense layer with highly ordered nanovoids structure. The dendrimer porous layer was covalently assembled in situ on the surface of the polysulfone (PSF) support by a diazotization-coupling reaction, and then the asymmetric polyamide nanofilm with highly ordered hollow nanostrips structure was formed by interfacial polymerization (IP) thereon. Tuning the number of the spherical dendrimer porous layers and IP time enabled control of the nanostrips morphology in the polyamide nanofilm. The asymmetric polyamide membrane exhibits a water flux of 3.7−4.3 times that of the traditional monolayer polyamide membrane, showing an improved divalent salt rejection rate (more than 99%), which thus surpasses the upper bound line of the permeability−selectivity performance of the existing various structural polyamide membranes. We estimate that this work might inspire the preparation of highly permeable and selective reverse osmosis (RO), organic solvent nanofiltration (OSNF) and pervaporation (PV) membranes.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Asymmetric polyamide nanofilms with highly ordered nanovoids for water purification

et al. 2020

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“…In contrast to use of COFs themselves as the selective layer, there are a number of reports that introduce COFs into TFC membranes or thin film nanocomposite (TFN) membranes, one kind of MMM for desalination. [ 48–51 ] In these systems, the COFs do not perform an ion‐sieving function explicitly. Among the technologies of membrane desalination, TFC membranes, typically assembled with highly crosslinked PA as an active layer on the top of a porous membrane support, have dominated the market due to their low cost and easy processability.…”

Section: Applications In Water Treatmentmentioning

confidence: 99%

“…This approach can help to construct TFC membranes with a very thin PA layer, which exhibit higher water permeance. [ 49 ] Yuan et al. reported a COF‐modulated composite membrane with permeance up to 535.5 L m −2 h −1 MPa −1 for nanofiltration.…”

Section: Applications In Water Treatmentmentioning

confidence: 99%

Covalent Organic Frameworks for Water Treatment

Xia

Zhao

Darling

2020

Adv Materials Inter

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Covalent organic frameworks (COFs) are an emerging type of porous crystalline material with highly ordered aperture size and tunable structures with designer properties. COFs have been proposed as promising materials for water treatment because of their notable intrinsic properties like excellent chemostability, high surface area, abundant functional sites, and uniform adjustable aperture size. This review focuses on fundamental COF design principles for water treatment (stability, aperture size, and surface functionalization) and the state‐of‐the‐art application of COFs in desalination, organic contaminant sorption, and ion capture. Additional potential promising applications of COFs for water treatment, including solar steam generation, photocatalysis for degradation of organic contaminants, and capacitive deionization are also presented along with an outlook toward future opportunities in the field.

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“…The lower salt permeation toward high-valent anion should be resulted from the electrostatic repulsive between salt and the negative charge of SBA-15(⊥)-Epo/ CS that repulses the high-valent anion and attracts the high-valent cation. [22][23] The outstanding salt permeation Furthermore, the filtration performance of SBA-15 (⊥)-Epo/CS membrane was investigated in long-term operation. As shown in Figure 4d, the water permeance decreases slightly at the early stage, and then tends to stabilize with the increase of time, while the rejection remains constant.…”

Section: Flux and Nanofiltration Performance Of Membranesmentioning

confidence: 99%

Mesoporous silica thin films incorporated chitosan mixed matrix nanofiltration membranes for textile wastewater treatment

Lai

Yang

Mou

2020

J Chinese Chemical Soc

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The demand of nanofiltration (NF) membranes for practical and cost-effective environmental treatment is exploding. Mixed matrix membranes (MMMs) have attracted tremendous interest on account of combining the benefits of polymer and inorganic fillers. In this study, mesoporous silica thin films with perpendicular nanochannels (SBA-15(⊥)) incorporated in chitosan (CS) were fabricated for dye wastewater purification. Functional groups, such as amino or epoxy groups were introduced into SBA-15(⊥) (SBA-15(⊥)-NH 2 , SBA-15(⊥)-Epo) for forming covalent bonds with chitosan matrix to improve their compatibility. The excellent performance in dye/salt fractionation in aqueous solution was demonstrated by SBA-15(⊥)-Epo/CS MMMs, which realized a cut off of 585 g/mol, 99.9% rejection of Congo red, while maintaining 85% permeation of NaCl. In addition, the separation mechanism of the resulting membrane was explored. The efficient NF performance of SBA-15(⊥)-Epo/CS membrane was attributed to its better compatibility between SBA-15(⊥)-Epo and chitosan matrix by virtue of the formation of covalent bonds thus to ensure the high dye rejection, and the vertically oriented nanochannels arrangement facilitated the molecule transportation. This work will inspire feasible synthesis of a new generation of MMMs membranes for dye wastewater purification.

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Covalent organic framework-modulated interfacial polymerization for ultrathin desalination membranes

Abstract: Covalent organic framework modulated interfacial polymerization enables the formation of ultrathin polyamide membrane for high-performance desalination.

Cited by 180 publications

References 46 publications

Asymmetric polyamide nanofilms with highly ordered nanovoids for water purification

Asymmetric polyamide nanofilms with highly ordered nanovoids for water purification

Covalent Organic Frameworks for Water Treatment

Mesoporous silica thin films incorporated chitosan mixed matrix nanofiltration membranes for textile wastewater treatment

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