Star polymer-assembled thin film composite membranes with high separation performance and low fouling

Jeon, Sungkwon; Park, Chan Hyung; Park, Sang Hee; Shin, Min Gyu; Kim, Hyun Ji; Baek, Kyung Youl; Chan, Edwin P.; Bang, Joona; Lee, Jung Hyun

doi:10.1016/j.memsci.2018.03.075

Cited by 38 publications

(15 citation statements)

References 51 publications

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“…Over the past decade, TFC membranes incorporating nanomaterials have been extensively studied (Figure ). This approach has been shown to successfully enhance water permeance − and improve anti(bio)fouling properties. − Nanomaterials can be incorporated into polyamide rejection layers by adding them in the monomer (MPD or TMC) solutions to prepare thin-film nanocomposite membranes (TFN, Figure a). , Alternatively, they can be added into the substrate to prepare thin-film composite membranes with a nanocomposite substrate (TFCn, Figure b) . Hoek and co-workers pioneered the concept of TFN in 2007 by incorporating porous zeolite nanoparticles (NPs) of 0.4 nm internal pores in the polyamide rejection layer of an RO membrane.…”

Section: Introductionmentioning

confidence: 99%

A Critical Review on Thin-Film Nanocomposite Membranes with Interlayered Structure: Mechanisms, Recent Developments, and Environmental Applications

Yang

Sun

et al. 2020

Environ. Sci. Technol.

392

161

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The separation properties of polyamide reverse osmosis and nanofiltration membranes, widely applied for desalination and water reuse, are constrained by the permeability-selectivity upper bound. Although thin-film nanocomposite (TFN) membranes incorporating nanomaterials exhibit enhanced water permeance, their rejection is only moderately improved or even impaired due to agglomeration of nanomaterials and formation of defects. A novel type of TFN membranes featuring an interlayer of nanomaterials (TFNi) has emerged in recent years. These novel TFNi membranes show extraordinary improvement in water flux (e.g., up to an order of magnitude enhancement) along with better selectivity. Such enhancements can be achieved by a wide selection of nanomaterials, ranging from nanoparticles, one-/two-dimensional materials, to interfacial coatings. The use of nanostructured interlayers not only improves the formation of polyamide rejection layers but also provides an optimized water transport path, which enables TFNi membranes to potentially overcome the longstanding trade-off between membrane permeability and selectivity. Furthermore, TFNi membranes can potentially enhance the removal of heavy metals and micropollutants, which is critical for many environmental applications. This review critically examines the recent developments of TFNi membranes and discusses the underlying mechanisms and design criteria. Their potential environmental applications are also highlighted.

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Section: Introductionmentioning

confidence: 99%

A Critical Review on Thin-Film Nanocomposite Membranes with Interlayered Structure: Mechanisms, Recent Developments, and Environmental Applications

Yang

Sun

et al. 2020

Environ. Sci. Technol.

392

161

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“…The improvement deduction of chlorine resistance of the modified membrane is illustrated in Scheme . Since amide bonds are the main targets of chlorine attacks, substances with NH bonds are preferentially chlorinated by free chlorine to reduce the erosion of the PA membrane surface. ,, It is reported that chlorine can contact with N atoms (amide) to damage the structure of PA chains (polymerized from PIP and TMC). , The primary amine with high activity on the PA layer modified by N-CQDs can be used as the sacrificial sites to react with chlorine-free radicals, which protect the PA chain to increase the chlorine resistance of the membrane. Moreover, dopamine is tightly bound to the support layer and separation layer, which reduces the chance of chlorine attacking amide nitrogen from the interface between the PA layer and substrate .…”

Section: Resultsmentioning

confidence: 99%

Corn Stalk-Derived Carbon Quantum Dots with Abundant Amino Groups as a Selective-Layer Modifier for Enhancing Chlorine Resistance of Membranes

Wang

Zhang

Cai

et al. 2021

ACS Appl. Mater. Interfaces

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Low permeability and chlorine resistance of normal thin-film composite (TFC) membranes restrict their practical applications in many fields. This study reports the preparation of a high chlorine-resistant TFC membrane for forward osmosis (FO) by incorporating corn stalk-derived N-doped carbon quantum dots (N-CQDs) into the selective polyamide (PA) layer to construct a polydopamine (PDA) sub-layer (PTFCCQD). Membrane modification is characterized by surface morphology, hydrophilicity, Zeta potential, and roughness. Results show that TFCCQD (without PDA pretreatment) and PTFCCQD membranes possess greater negative surface charges and thinner layer-thickness (less than 68 nm). With N-CQDs and PDA pretreatment, the surface roughness of the PTFCCQD membrane decreases significantly with the co-existence of microsized balls and flocs with a dense porous structure. With the variation of concentration and type of draw solution, the PTFCCQD membrane exhibits an excellent permeability with low J (reverse salt flux)/J (water flux) values (0.1-0.25) due to the enhancement of surface hydrophilicity and the shortening of permeable paths. With 16,000 ppm·h chlorination, reverse salt flux of the PTFCCQD membrane (8.4 g m–2 h–1) is far lower than those of TFCCQD (136.2 g m–2 h–1), PTFC (127.6 g m–2 h–1), and TFC (132 g m–2 h–1) membranes in FO processes. The decline of salt rejection of the PTFCCQD membrane is only 8.2%, and the normalized salt rejection maintains 0.918 in the RO system (16,000 ppm·h chlorination). Super salt rejection is ascribed to the existence of abundant NH bonds (N-CQDs), which are preferentially chlorinated by free chlorine to reduce the corrosion of the PA layer. The structure of the PA layer is stable during chlorination also due to the existence of various active groups grafted on the surface. This study may pave a new direction for the preparation of durable biomass-derivative (N-CQD)-modified membranes to satisfy much more possible applications.

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“…To solve these obstacles, strategies such as substrate modification, new monomer design, additive introduction and surface post‐treatment are attempted. For the UF substrate, incorporating hydrophilic or amphiphilic molecules can not only increase the surface porosity but also accelerate the diffusion rate of aqueous monomer into the interface; thus, obtaining membrane with low thickness, high permeability and better separation selectivity [33]. Moreover, construction of interlayer/sacrificial layer (e.g.…”

Section: High‐performance Nf Membranes For Bio‐separationmentioning

confidence: 99%

Nanofiltration membrane for bio‐separation: Process‐oriented materials innovation

Cao

Chen

Wan

et al. 2021

Engineering in Life Sciences

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Nanofiltration (NF) with advantages of high efficiency and low‐cost has attracted increasing attentions in bio‐separation. However, the large‐scale application is limited by the inferior molecular selectivity, low chemical stability and serious membrane fouling. Many efforts, thus, have been devoted in NF materials design for specific applications to enhance the separation efficiency of bio‐products and increase membrane life‐time, as well as reduce the operating cost. This review summarized the recent progress of NF applications in bio‐separation, discussed various demands for NF membrane in the bio‐products purification and corresponding material innovations, finally proposed several practical suggestions for future research, which provided directions and guidance toward further product development and process industrialization.

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Star polymer-assembled thin film composite membranes with high separation performance and low fouling

Cited by 38 publications

References 51 publications

A Critical Review on Thin-Film Nanocomposite Membranes with Interlayered Structure: Mechanisms, Recent Developments, and Environmental Applications

A Critical Review on Thin-Film Nanocomposite Membranes with Interlayered Structure: Mechanisms, Recent Developments, and Environmental Applications

Corn Stalk-Derived Carbon Quantum Dots with Abundant Amino Groups as a Selective-Layer Modifier for Enhancing Chlorine Resistance of Membranes

Nanofiltration membrane for bio‐separation: Process‐oriented materials innovation

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