High flux nanofiltration membranes prepared with a graphene oxide homo-structure

Zhao, Guoke; Hu, Ruirui; Zhao, Xuanliang; He, Yijia; Zhu, Hongwei

doi:10.1016/j.memsci.2019.05.028

Cited by 51 publications

(16 citation statements)

References 44 publications

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“…Our numerical simulations also reveal that methyl groups 5 enhance the water flux by improving the water slip length and limiting the steric effect compared to other larger functional groups (Supplementary Figs. 31,42,43).…”

Section: Molecular Dynamic Simulations Of Water Fluxmentioning

confidence: 99%

Enhanced sieving from exfoliated MoS2 membranes via covalent functionalization

et al. 2019

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Nanolaminate membranes made of two-dimensional materials (2D) such as graphene oxide (GO) are promising candidates for molecular sieving via size-limited diffusion in the 2D capillaries, but high hydrophilicity makes these membranes unstable in water. Here, we 25 report a nanolaminate membrane based on covalently functionalized molybdenum disulfide (MoS 2 ) nanosheets. The functionalized MoS 2 membranes demonstrate >90% and ~ 87% rejection for micropollutants and NaCl respectively when operating under reverse osmotic conditions. The sieving performance and water flux of the functionalized MoS 2 membranes are attributed to both control of the capillary widths of the nanolaminates and 30 control of the surface chemistry of the nanosheets. We identified small hydrophobic 20 12 References

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Section: Molecular Dynamic Simulations Of Water Fluxmentioning

confidence: 99%

Enhanced sieving from exfoliated MoS2 membranes via covalent functionalization

et al. 2019

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“…(2) Second, hydroxyl (−OH) groups functionalized on the nanosheets contribute to the improvement of membranes’ hydrophilicity, which are confirmed by contact angle measurements (59° for MoS 2 membranes and 64° for WS 2 membranes) in Figure S7. It has been reported that the hydrophilic surface of the membrane contributes to the water aggregation at the MoS 2 and WS 2 nanosheets facilitating the diffusion of water molecules. , …”

Section: Resultsmentioning

confidence: 99%

“…It has been reported that the hydrophilic surface of the membrane contributes to the water aggregation at the MoS 2 and WS 2 nanosheets facilitating the diffusion of water molecules. 40,41 To demonstrate the effect of ultrasmall nanosheets on the high water permeation through the membranes, water fluxes of MoS 2 membranes with ultrasmall small nanosheets (∼30 nm) in Figure S1c were tested. These kinds of MoS 2 nanosheets were exfoliated for 10 h. As displayed in Figure 3b, the water flux of these membranes with 30 nm nanosheets were higher than that of membranes with 70 nm nanosheets.…”

mentioning

confidence: 99%

Transition Metal Dichalcogenide (TMD) Membranes with Ultrasmall Nanosheets for Ultrafast Molecule Separation

Liú

Yang

et al. 2020

ACS Appl. Mater. Interfaces

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transition metal dichalcogenide membranes have entered the spotlight for nanofiltration application owing to the novel mass transport properties in nanochannels. However, further improving the water permeability with high molecular separation rate simultaneously is challenging. In this work, to achieve ultrafast molecule separation, MoS 2 and WS 2 nanosheets with ultrasmall lateral size (<100 nm) are fabricated by sucrose-assisted mechanochemical exfoliation. Ultrasmall nanosheets in the membranes cut down average length of water-transporting paths and create more nanochannels and nanocapillaries for water molecules to pass through membranes. The water flux of these kinds of MoS 2 and WS 2 membranes are significantly enhanced to 918 and 828 L/m 2 h bar, respectively, which is four and two times higher than those of previously reported MoS 2 and WS 2 membranes with larger lateral size nanosheets. In addition, MoS 2 and WS 2 membranes display excellent rejection performance for rhodamine B and Evans blue with a high rejection rate (∼99%). This study provides a promising method to improve the performance of 2D laminar membranes for nanofiltration application by using ultrasmall 2D nanosheets.

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“…This improved performance is attributed to the improved hydrophilicity, increased effective surface area, introduction of a large cavity at the interface, and the enhanced thermal stability of the overall matrix membrane. (The performance of GOQD membranes in the field of nanofiltration is depicted in Figure c,d) . In fact, the addition of GO in PA matrix also prevents a chlorine attack and enhances the antifouling properties of the existing polymeric membranes. , (The comparison of PA-GO and PA-PSF membranes is depicted in Figure a,b).…”

Section: Class 1: Laminar Membranesmentioning

confidence: 99%

“…(c) Water flux and (d) rejection rates when separating Na 2 SO 4 , NaCl, and MgSO 4 aqueous solutions by the membranes fabricated with varying GO QDs contents. Reprinted from ref with permission from Elsevier. The comparison of performances of the PA-GO and PA-PSF membranes.…”

Section: Class 1: Laminar Membranesmentioning

confidence: 99%

Structure Dependent Water Transport in Membranes Based on Two-Dimensional Materials

Bakshi

Bustamante

Sui

et al. 2021

Ind. Eng. Chem. Res.

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The upsurge in population and industrialization has instigated the demand in improvement in the existing water purification systems. Numerous organic, and later inorganic materials, have showcased huge potential in different membrane separation processes. Recently, a novel range of two-dimensional (2D) materials possessing atomic thickness, high robustness, excellent mechanical stability, and even great fouling resistance have shown their appealing potential as membrane materials in this respect. The high aspect ratios of 2D materials enable the feasible control of membrane assembled structures. The membrane structure of 2D materials plays a crucial role in separation performance. Regarding the molecular transport pathway, the assembled structure is categorized into laminates and in-plane pores here. From this aspect, this review discusses the most recently progress of 2D materials membranes, including graphene-based materials, MXenes, transition metal dichalcogenides, metal organic frameworks, covalent organic frameworks, and boron nitride, in the field of water purification. According to their membrane assembled structures, the design strategies with separation mechanism and separation performance have been reviewed. Lastly, challenges and futuristic upgrades to enhance their membrane operation are discussed accordingly. This review provides a new perspective of 2D material assemblies on membrane design for advancing separation performance in water purification.

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High flux nanofiltration membranes prepared with a graphene oxide homo-structure

Cited by 51 publications

References 44 publications

Enhanced sieving from exfoliated MoS2 membranes via covalent functionalization

Enhanced sieving from exfoliated MoS2 membranes via covalent functionalization

Transition Metal Dichalcogenide (TMD) Membranes with Ultrasmall Nanosheets for Ultrafast Molecule Separation

Structure Dependent Water Transport in Membranes Based on Two-Dimensional Materials

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