Enhanced water flux through graphitic carbon nitride nanosheets membrane by incorporating polyacrylic acid

Wang, Yanjie; Liu, Lingfei; Xue, Jian; Hou, Jiamin; Ding, Li; Wang, Haihui

doi:10.1002/aic.16076

Cited by 71 publications

(26 citation statements)

References 49 publications

(63 reference statements)

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“…In contrast to other nanomaterials, nanosheets stand out, due to their chemical inertness, flexibility, and physio-chemical and optoelectronic properties. In the field of membrane technology, the application of nanosheets yields high separation, mechanical strength, and it forms flexible structures [ 24 ].…”

Section: 2d Nanosheet Membranesmentioning

confidence: 99%

“…Drawbacks for the use of nanoparticles, such as TiO 2 in membranes, include pore-blocking, the agglomeration of the nanoparticles, degradation of the membrane via a photocatalytic defect, and leaching of the nanoparticles. By contrast, two-dimensional (2D) nanomaterials have shown promise as building blocks or fillers for membranes, due to their mechanical strength, flexible structure, chemical inertness, and separation performance [ 24 ]. Such 2D nanomaterials are so-called nanosheets and they are characterized by their high surface areas and an atomic thickness that exposes all of the ions to the surface, thus enabling electronic coupling [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

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2D Nanocomposite Membranes: Water Purification and Fouling Mitigation

et al. 2020

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In this study, the characteristics of different types of nanosheet membranes were reviewed in order to determine which possessed the optimum propensity for antifouling during water purification. Despite the tremendous amount of attention that nanosheets have received in recent years, their use to render membranes that are resistant to fouling has seldom been investigated. This work is the first to summarize the abilities of nanosheet membranes to alleviate the effect of organic and inorganic foulants during water treatment. In contrast to other publications, single nanosheets, or in combination with other nanomaterials, were considered to be nanostructures. Herein, a broad range of materials beyond graphene-based nanomaterials is discussed. The types of nanohybrid membranes considered in the present work include conventional mixed matrix membranes, stacked membranes, and thin-film nanocomposite membranes. These membranes combine the benefits of both inorganic and organic materials, and their respective drawbacks are addressed herein. The antifouling strategies of nanohybrid membranes were divided into passive and active categories. Nanosheets were employed in order to induce fouling resistance via increased hydrophilicity and photocatalysis. The antifouling properties that are displayed by two-dimensional (2D) nanocomposite membranes also are examined.

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Section: 2d Nanosheet Membranesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

2D Nanocomposite Membranes: Water Purification and Fouling Mitigation

et al. 2020

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“…In particular, the increasingly developed nanotechnology has provided many new nanomaterials for the construction of innovative functional membranes . Among those various nanomaterials, two‐dimensional (2D) nanosheets with a thickness on the atomic scale have attracted intensive attention as functional membranes because of their extraordinary chemical and physical properties . The 2D nanosheets produced through the exfoliation of bulk layered materials can restack to be lamellar membranes, and excellent water permeance and unwanted species rejection can be achieved by tuning the interlayer spacing between contiguous nanosheets .…”

Section: Introductionmentioning

confidence: 99%

“…[8,9] Among those variousn anomaterials, two-dimensional (2D) nanosheets with at hickness on the atomics cale have attracted intensive attention as functional membranes because of their extraordinary chemicala nd physical properties. [10,11] The 2D nanosheets produced through the exfoliation of bulk layered materials can restack to be lamellar membranes, and excellentw ater permeance and unwanted speciesr ejection can be achieved by tuning the interlayer spacingb etween contiguous nanosheets. [12,13] For instance, graphene oxide (GO) based membranes, which were widely investigated as 2D membranes, have shown potentiala pplicationi nw ater treatment owing to their unique molecule-sieving performance combined with fast water permeation.…”

Section: Introductionmentioning

confidence: 99%

Highly Stable and Antibacterial Two‐Dimensional Tungsten Disulfide Lamellar Membrane for Water Filtration

et al. 2018

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Two‐dimensional (2D) lamellar membranes consisting of restacked WS2 nanosheets have shown excellent separation properties for water filtration. The stability, antifouling properties, and antibacterial activities of the WS2 laminar membranes were investigated for practical application. We discovered that the separation properties of the WS2 laminar membranes changed slightly after soaking in water for 28 days as well as that of a 45 h‐cross‐flow filtration, demonstrating an extraordinary operational stability of the WS2 laminar membranes. The remarkable stability is related to the dominant van der Waals interactions between WS2 nanosheets. In addition, the WS2 laminar membranes exhibited excellent antibacterial properties against S. aureus and E. coli with antibacterial rates of 91.3 % and 89.7 %, respectively. These properties of the WS2 laminar membranes make them promising candidates for application in water filtration.

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“…In addition to highly effective ion‐rejection properties, 2D membranes are also known to possess excellent water permeability. Due to these properties, many 2D materials such as nm‐thick graphitic carbon nitride (g‐C 3 N 4 ) nanosheets, MoS 2 sheets, WS 2 nanosheets, graphene, Mxene nanosheets, and graphene oxide (GO), have been recently used as the building blocks for fabricating ultrathin layered membranes for separation applications. These 2D membranes have shown highly efficient size‐selective ion separation and high water permeance.…”

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confidence: 99%

Charged Layered Boron Nitride‐Nanoflake Membranes for Efficient Ion Separation and Water Purification

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et al. 2019

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most intensively studied research areas in the development of high-performance separation membranes.Most 2D materials typically have a layered geometry where the atoms are linked by strong in-plane covalent bonds, while the two adjacent layers are held together by van der Waals forces. [7] Exfoliated nanosheets typically show a high surface-area-tothickness ratio, which is instrumental in improving the adsorption capacity or the ion selectivity, both of which can lead to a better separation performance. In addition to highly effective ion-rejection properties, 2D membranes are also known to possess excellent water permeability. Due to these properties, many 2D materials such as nm-thick graphitic carbon nitride (g-C 3 N 4 ) nanosheets, [8] MoS 2 sheets, [9] WS 2 nanosheets, [6] graphene, [10] Mxene nanosheets, [11] and graphene oxide (GO), [12] have been recently used as the building blocks for fabricating ultrathin layered membranes for separation applications. These 2D membranes have shown highly efficient size-selective ion separation and high water permeance.Hexagonal boron nitride (h-BN), so-called "white graphene," is however one of the promising 2D materials that has not been utilized to its full potential in ion-separation applications. For efficient ion separation, the membrane should show high ion selectivity, which is primarily dependent on the channel size and surface charge on the membrane. The h-BN material is known to have a high surface charge density resulting from the adsorption of the hydroxyl ions on the surface defect sites. [13] It also shows excellent oxidation and corrosion resistance, which is an important property for wastewater treatment applications. The high chemical stability of h-BN also enables it to be resistant to chemical cleaning, which is frequently needed during separation processes. Qin et al. reported high ionic conductivities for h-BN nanofluidic channels, prepared by the one-step BN exfoliation method and amine functionalization. [14] More recently, Chen et al. developed a 2D h-BN membrane by functionalizing h-BN flakes (h-BNF) with amino groups to overcome its poor water dispersibility. The functionalized h-BNF membranes demonstrated fast solvent transport and good ion-rejection properties, based on molecular sieving mechanism. [15] However, these membranes do not show charge-based (Donnan) exclusion, due to the amine functionalization of the 2D layered nanomaterials have attracted considerable attention for their potential for highly efficient separations, among other applications. Here, a 2D lamellar membrane synthesized using hexagonal boron nitride nanoflakes (h-BNF) for highly efficient ion separation is reported. The ion-rejection performance and the water permeance of the membrane as a function of the ionic radius, ion valance, and solution pH are investigated. The nonfunctionalized h-BNF membranes show excellent ion rejection for small sized salt ions as well as for anionic dyes (>97%) while maintaining a high water permeability, ≈1.0 × 10 −3 L m m −2 h −1 bar −1...

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Enhanced water flux through graphitic carbon nitride nanosheets membrane by incorporating polyacrylic acid

Cited by 71 publications

References 49 publications

2D Nanocomposite Membranes: Water Purification and Fouling Mitigation

2D Nanocomposite Membranes: Water Purification and Fouling Mitigation

Highly Stable and Antibacterial Two‐Dimensional Tungsten Disulfide Lamellar Membrane for Water Filtration

Charged Layered Boron Nitride‐Nanoflake Membranes for Efficient Ion Separation and Water Purification

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