Use of rigid cucurbit[6]uril mediating selective water transport as a potential remedy to improve the permselectivity and durability of reverse osmosis membranes

Lee, Jae Woo; Zhou, Feng; Baek, Kangkyun; Kim, Wooram; Su, Haibin; Kim, Kimoon; Wang, Rong; Bae, Tae‐Hyun

doi:10.1016/j.memsci.2020.119017

Cited by 25 publications

(21 citation statements)

References 35 publications

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“…The previous study demonstrated that CB [6] can be used to improve the permselectivity of thin-film nanocomposite reverse osmosis membranes thanks to the selective water transport characteristics of CB [6] [28]. However, the ideal future scenario would be to construct a single-layer film by seamlessly assembling CB [6]s on top of a porous support to make full use of CB [6]'s performance.…”

Section: Simulations To Determine the Desalination Performance Of The...mentioning

confidence: 99%

“…More importantly, such excellent water permeability was achieved without any salt passage. NaCl ions can hardly diffuse through not only the CB [6] portal due to the remarkable electrostatic repulsion [28] but also the inter-CB [6] space because of the hydrophobic nature of the linker and the effective space filled by side chains. The dynamic behavior of water molecules in the CB [6] nanosheet is presented in Figure 3c, which demonstrates that water molecules are predominantly passing through the CB [6] cavity instead of the hydrophobic interstitial space.…”

Section: Simulations To Determine the Desalination Performance Of The...mentioning

confidence: 99%

“…The previous study demonstrated that CB [6] possesses selective water transport characteristics stemming from the carbonyl-fringed portal of 3.9 Å [28]. However, it does not necessarily mean that CB [6] is the best among cucurbituril homologues to make desalination membranes.…”

Section: Qm Calculations To Weigh Up the Best Candidate Among Cucurbi...mentioning

confidence: 99%

“…However, their membrane was far from a single-layer membrane with desirable pores for selective water transport due to the preparation method (i.e., laminate membranes and cavities filled with guest molecules). Meanwhile, Cao et al [27] and Lee et al [28] have recently demonstrated the great potential of CB [6] for selective water transport in the form of polymeric nanocomposite membranes, but their membranes were also inappropriate for exploring the performance of a single-layer CB [6] membrane.…”

Section: Introductionmentioning

confidence: 99%

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Mechanisms of Efficient Desalination by a Two-Dimensional Porous Nanosheet Prepared via Bottom-Up Assembly of Cucurbit[6]urils

et al. 2022

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Many researchers have examined the desalination performance of various kinds of two-dimensional (2D) porous nanosheets prepared by top-down approaches such as forming pores on the plain based on molecular dynamics (MD) simulations. In contrast, it is rare to find MD simulations addressing the desalination performance of a 2D porous nanosheet prepared by bottom-up approaches. We investigated the desalination performance of a 2D porous nanosheet prepared by the assembly of cucurbit[6]uril (CB[6]) via MD simulation. The model 2D CB[6] nanosheet features CB[6] with the carbonyl-fringed portals of 3.9 Å and the interstitial space filled with hydrophobic linkers and dangling side chains. Our MD simulation demonstrated that the 2D porous CB[6] nanosheet possesses a 70 to 140 times higher water permeance than commercial reverse osmosis membranes while effectively preventing salt passage. The extremely high water permeance and perfect salt rejection stem from not only CB[6]’s nature (hydrophilicity, negative charge, and the right dimension for size exclusion) but also the hydrophobic and tightly filled interstitial space. We also double-checked that the extremely high water permeance was attributable to only CB[6]’s nature, not water leakage, by contrasting it with a 2D nanosheet comprising CB[6]-spermine complexes. Lastly, this paper provides a discussion on a better cucurbituril homologue to prepare a next-generation desalination membrane possessing great potential to such an extent to surpass the 2D porous CB[6] nanosheet based on quantum mechanics calculations.

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Section: Simulations To Determine the Desalination Performance Of The...mentioning

confidence: 99%

Section: Simulations To Determine the Desalination Performance Of The...mentioning

confidence: 99%

Section: Qm Calculations To Weigh Up the Best Candidate Among Cucurbi...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanisms of Efficient Desalination by a Two-Dimensional Porous Nanosheet Prepared via Bottom-Up Assembly of Cucurbit[6]urils

et al. 2022

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“…However, some contaminants exhibited lower removal efficiency than 50% (e.g., Ni 2+ : 44.4%; Cd 2+ : 42.8%), demonstrating a need for further improvement in removal efficiency. Moreover, high removal efficiency should be pursued, taking into account that the need for more environmentally friendly materials is growing as many countries have sought to attain a sustainable and green economy to overcome global climate change [ 89 , 90 ]. From the perspective of environmental sustainability, the toxic and volatile nature of some organic solvents (e.g., Dimethylformamide (DMF)) have propelled the development of bio-based polymers for membrane fabrication.…”

Section: Conclusive Remarksmentioning

confidence: 99%

Emerging Materials to Prepare Mixed Matrix Membranes for Pollutant Removal in Water

et al. 2021

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Various pollutants of different sizes are directly (e.g., water-borne diseases) and indirectly (e.g., accumulation via trophic transfer) threatening our water health and safety. To cope with this matter, multifaceted approaches are required for advanced wastewater treatment more efficiently. Wastewater treatment using mixed matrix membranes (MMMs) could provide an excellent alternative since it could play two roles in pollutant removal by covering adsorption and size exclusion of water contaminants simultaneously. This paper provides an overview of the research progresses and trends on the emerging materials used to prepare MMMs for pollutant removal from water in the recent five years. The transition of the research trend was investigated, and the most preferred materials to prepare MMMs were weighed up based on the research trend. Various application examples where each emerging material was used have been introduced along with specific mechanisms underlying how the better performance was realized. Lastly, the perspective section addresses how to further improve the removal efficiency of pollutants in an aqueous phase, where we could find a niche to spot new materials to develop environmentally friendly MMMs, and where we could further apply MMMs.

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Cucurbit[6]uril-tuned nanochannels of graphene oxide membrane for enhanced water flux in nanofiltration

Yang,

Liu,

Whalley

et al. 2025

Chemical Engineering Journal

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Use of rigid cucurbit[6]uril mediating selective water transport as a potential remedy to improve the permselectivity and durability of reverse osmosis membranes

Cited by 25 publications

References 35 publications

Mechanisms of Efficient Desalination by a Two-Dimensional Porous Nanosheet Prepared via Bottom-Up Assembly of Cucurbit[6]urils

Mechanisms of Efficient Desalination by a Two-Dimensional Porous Nanosheet Prepared via Bottom-Up Assembly of Cucurbit[6]urils

Emerging Materials to Prepare Mixed Matrix Membranes for Pollutant Removal in Water

Cucurbit[6]uril-tuned nanochannels of graphene oxide membrane for enhanced water flux in nanofiltration

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