Rapid in-situ covalent crosslinking to construct a novel azo-based interlayer for high-performance nanofiltration membrane

Zhao, Shengchao; Li, Longting; Wang, Ming; Tao, Lihong; Hou, Yingfei; Niu, Q. Jason

doi:10.1016/j.seppur.2020.118029

Cited by 35 publications

(9 citation statements)

References 44 publications

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“…In addition to increased membrane surface area, the formation of crumpled morphology is often accompanied by the reduced intrinsic thickness of polyamide layers (Figure b2), ,− which is possibly ascribed to the changes in interfacial polymerization reaction (see the section “Interfacial Instability”) such as inhibited amine monomer diffusion and facilitated polyamide film formation. This reduced thickness of the rejection layer, in some cases up to ∼6 times, also favors an improved water permeance of crumpled NF membranes (Figure b2).…”

Section: Critical Analysis Of Water and Solutes Transport Mechanisms ...mentioning

confidence: 99%

Nanofiltration Membranes with Crumpled Polyamide Films: A Critical Review on Mechanisms, Performances, and Environmental Applications

Shao

Zeng

et al. 2022

Environ. Sci. Technol.

134

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Nanofiltration (NF) membranes have been widely applied in many important environmental applications, including water softening, surface/groundwater purification, wastewater treatment, and water reuse. In recent years, a new class of piperazine (PIP)-based NF membranes featuring a crumpled polyamide layer has received considerable attention because of their great potential for achieving dramatic improvements in membrane separation performance. Since the report of novel crumpled Turing structures that exhibited an order of magnitude enhancement in water permeance (Science2018360518521), the number of published research papers on this emerging topic has grown exponentially to approximately 200. In this critical review, we provide a systematic framework to classify the crumpled NF morphologies. The fundamental mechanisms and fabrication methods involved in the formation of these crumpled morphologies are summarized. We then discuss the transport of water and solutes in crumpled NF membranes and how these transport phenomena could simultaneously improve membrane water permeance, selectivity, and antifouling performance. The environmental applications of these emerging NF membranes are highlighted, and future research opportunities/needs are identified. The fundamental insights in this review provide critical guidance on the further development of high-performance NF membranes tailored for a wide range of environmental applications.

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Section: Critical Analysis Of Water and Solutes Transport Mechanisms ...mentioning

confidence: 99%

Nanofiltration Membranes with Crumpled Polyamide Films: A Critical Review on Mechanisms, Performances, and Environmental Applications

Shao

Zeng

et al. 2022

Environ. Sci. Technol.

134

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“…By contrast, when a hexane rinsing step was adopted right after the IP reaction, most of the unreacted TMC monomers could be washed away, which was supposed to be the primary purpose of applying this step in previous relevant studies. − The loosely polymerized segments could also be partially removed from the active layer surface by solvent rinsing, as demonstrated by the few studies on RO membranes. , These effects exerted on the nascent membrane by hexane rinsing led to decreased active layer thickness and reduced surface negative charges of R60–H5 and R60–H30 compared to those of R60.…”

Section: Resultsmentioning

confidence: 99%

Hexane Treatment to Facilely Tailor Polyamide Nanofiltration Membrane Performance: The Critical Role of Treatment Duration

et al. 2023

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Facile methods for simultaneously tailoring various properties of nanofiltration (NF) membranes are of great significance for fit-for-purpose membrane design and thus achieving more efficient NF applications. This study revealed that, when preparing polyamide (PA) thin-film composite (TFC) NF membranes, a simple hexane treatment right after the interfacial polymerization reaction could substantially alter membrane properties and enhance separation performance for drinking water treatment, with the degree particularly dependent on the treatment time even in the magnitude of tens of seconds. Hexane rinsing for 5 s could lead to a thinner active layer and achieve more improvement (>60%) of water permeance, while a more effective reduction (∼70%) of membrane surface negative charge density could be realized by hexane soaking for a prolonged time. These property variations rendered the hexane-treated membranes more competitive than representative commercial and lab-made conventional PA membranes for hardness removal. Moreover, the membrane rejection performance for organic micropollutants could be maintained after hexane treatments of varying durations due to the barely unaltered membrane pore sizes. The involved mechanisms include removal of loosely polymerized PA segments and unreacted monomers from the membrane surface and the provision of a solvent environment for the further cross-linking of residual monomers. This study provides a facile strategy and mechanistic insights for the development of TFC membranes with tailored properties for efficient drinking water treatment.

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“…(c) Trade-off relationship between water/salt selectivity ( A/B ) and water permeability ( A ). (d) Summary of water permeability and Na 2 SO 4 and NaCl rejection of NF-based membranes reported in the literature. ,− The effect of concentration polarization was considered, and details are given in Section S11.…”

Section: Resultsmentioning

confidence: 99%

Employing Visible Light To Construct Photoinitiated Polymerized Nanofiltration Membranes for High Permeation and Environmental Micropollutant Removal

Wang

Bai

Wang

et al. 2023

Environ. Sci. Technol.

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Improving the nanofiltration (NF) performance of membrane-based treatment is conducive to promoting environmental water recycling and addressing water resource depletion. Combinations of light, electricity, and heat with traditional techniques of preparing membranes should optimize membrane performance. Interfacial polymerization and photopolymerization were integrated to construct a photopolymerized thin-film composite NF membrane with a ridged surface morphology. Under visible light initiation, 2-acrylamido-2-methyl-1-propanesulfonic acid was crosslinked with the polyamide network. The control effects of light on the membrane surface and physicochemical properties were revealed via infrared thermal images and response surface methodology. To present the diffusion motion of piperazine molecules, molecular dynamics simulations were implemented. Through density functional theory simulations, the crosslinking mechanism of the photoinduced NF network was identified and verified. The surface physicochemical characteristics and perm-selectivity performance were systematically illustrated. The photopolymerized membrane outperformed the pristine in permeability and selective separation competence; without degradation of solute repulsion, the water permeation was enhanced to 33.5 L m–2 h–1 bar–1, 6.6 times that of the initial membrane. In addition, the removal of organic contaminants and antifouling capacities were improved. This work represents a novel lead for applying sustainable resources in constructing high-performance membranes for environmental challenges.

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Rapid in-situ covalent crosslinking to construct a novel azo-based interlayer for high-performance nanofiltration membrane

Cited by 35 publications

References 44 publications

Nanofiltration Membranes with Crumpled Polyamide Films: A Critical Review on Mechanisms, Performances, and Environmental Applications

Nanofiltration Membranes with Crumpled Polyamide Films: A Critical Review on Mechanisms, Performances, and Environmental Applications

Hexane Treatment to Facilely Tailor Polyamide Nanofiltration Membrane Performance: The Critical Role of Treatment Duration

Employing Visible Light To Construct Photoinitiated Polymerized Nanofiltration Membranes for High Permeation and Environmental Micropollutant Removal

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