Thin-Film Nanocomposite Membranes Containing Water-Stable Zirconium Metal–Organic Cages for Desalination

Liu, Guoliang; Zhang, Xiaomei; Yuan, Yi; Yuan, Hao; Li, Nanxi; Ying, Yunpan; Peh, Shing Bo; Wang, Yuxiang; Cheng, Youdong; Cai, Yahui; Gu, Zhonghua; Cai, Hong; Zhao, Dan

doi:10.1021/acsmaterialslett.0c00511

Cited by 46 publications

(30 citation statements)

References 46 publications

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“…Recent advances in our group 14 and by Zhao et al 19 have made possible the large-scale fabrication of high density multichannel AWC−polyamide hybrid materials, for the production of stable and highly performant biomimetic membranes that overcome current industrial RO membrane performances for desalination. We postulated that one of the most creative strategies for addressing such scale-up challenges was to combine the colloidal AWC soft aggregates with the PA, known for its easy industrial scalability.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Bilayer versus Polymeric Artificial Water Channel Membranes: Structural Determinants for Enhanced Filtration Performances

et al. 2021

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Artificial water channels (AWCs) and their natural aquaporin counterparts selectively transport water. They represent a tremendous source of inspiration to devise biomimetic membranes for several applications, including desalination. They contain variable water-channel constructs with adaptative architectures and morphologies. Herein, we critically discuss the structural details that can impact the performances of biomimetic I quartets, obtained via adaptive self-assembly of alkylureidoethylimidazoles HC4−HC18 in bilayer or polyamide (PA) membranes. We first explore the performances in bilayer membranes, identifying that hydrophobicity is an essential key parameter to increase water permeability. We compare various I quartets with different hydrophobic tails (from HC4 to HC18), and we reveal that a huge increase in single-channel water permeability, from 10 4 to 10 7 water molecules/s/channel, is obtained by increasing the size of the alkyl tail. Quantitative assessment of AWC−PA membranes shows that water permeability increases roughly from 2.09 to 3.85 L m −2 h −1 bar −1 , for HC4 and HC6 reverse osmosis membranes, respectively, while maintaining excellent NaCl rejection (99.25−99.51%). Meanwhile, comparable HC8 loading induces a drop of performance reminiscent of a defective membrane formation. We show that the production of nanoscale sponge-like water channels can be obtained with insoluble, low soluble, and low dispersed AWCs, explaining the observed subpar performance. We conclude that optimal solubility enabling breakthrough performance must be considered to not only maximize the inclusion and the stability in the bilayer membranes but also achieve an effective homogeneous distribution of percolated particles that minimizes the defects in hybrid polyamide membranes.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Bilayer versus Polymeric Artificial Water Channel Membranes: Structural Determinants for Enhanced Filtration Performances

et al. 2021

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“…Zhao and co-workers used a similar strategy to build thin-film nanocomposite membranes containing MOC-28. [68] First, they wetted the polysulfone (PSF) substrate with a mixed solution of MOC-28 and m-phenylenediamine (MPD) and then poured a hexane solution of trimesoyl chloride (TMC) into it for interfacial polymerization to obtain product 50 (Figure 18b). Different films can be obtained by changing the amount of MOC-27, and part of MPD is replaced with N,Ndimethylacetamide (DMA) to optimize the film (called the "defectiveligand" strategy).…”

Section: Incorporating Mocs Into a Polymer Membranementioning

confidence: 99%

Strategies for the Construction of Functional Materials Utilizing Presynthesized Metal‐Organic Cages (MOCs)

Liu

et al. 2022

ChemPlusChem

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Metal‐organic cages (MOCs) that assemble from metal ions or metal clusters and organic ligands have attracted the interest of the scientific community because of their various functional coordination cavities. Unlike metal‐organic frameworks (MOFs) with infinite frameworks, MOCs have discrete structures, making them soluble and stable in certain solvents and facilitating their application as starting reagents in the further construction of single components or composite materials. In recent years, increasing progress has been made in this field. In this review, we introduce these works from the perspective of design strategies, and focus on how presynthesized MOCs can be used to construct functional materials. Finally, we discuss the challenges and development prospects in this field.

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“…[3,4] Numerous strategies have been tested to overcome the limitations PA structure, including homogeneous fabrication via improved phase transfer of the monomers or via functional grafting on the PA. Efficient polymer spacing by the insertion of rigid molecular fillers, [5] or of supramolecular macrocycles [6][7][8][9] and cages [10] were used to increase the freevolume of the composite membranes (Figure 1a) or porous polymeric powders. [11][12][13][14][15] Filtration performances are controlled by the presence of defects at the boundaries between PA and nanoparticulate supramolecular fillers, limiting their selectivity to large molec-ular compounds (i. e. dyes, solvents, etc.).…”

Section: Introductionmentioning

confidence: 99%

Enhanced Desalination Polyamide Membranes Incorporating Pillar[5]arene through in‐Situ Aggregation‐Interfacial Polymerization‐isAGRIP

2021

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Membrane-based desalination have an important role in water purification. Inspired by highly performant biological proteins, artificial water channels (AWC) have been proposed as active components to overcome the permeability/selectivity trade-off of desalination processes. Promising performances have been reported with Pillararene crystalline phases revealing impressive molecular-scale separation performances, when used as selective porous materials. Herein, we demonstrate that Pillar[5]arene PA [5] aggregates are in-situ generated and incorporated during the interfacial polymerization, within industrially relevant reverse osmosis polyamide-PA membranes.In particular, we explore the best combination between PA [5] aggregates and m-phenylenediamine (MPD) and trimesoylchloride (TMC) monomers to achieve their seamless incorporation in a defect-free hybrid polyamide PA[5]-PA membranes for enhanced desalination. The performances of the reference and hybrid membranes are evaluated by cross-flow filtration under real reverse osmosis conditions (15.5 bar of applied pressure) by filtration of brackish feed streams. The optimized membranes achieve a ~40 % improvement, in water permeance of ~2.76 � 0.5 L m À 2 h À 1 bar À 1 and high 99.5 % NaCl rejection with respect to the reference TFC membrane and a similar water permeance compared to one of the best commercial BW30 membranes (3.0 L m À 2 h À 1 bar À 1 and 99.5 % NaCl rejection).

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Thin-Film Nanocomposite Membranes Containing Water-Stable Zirconium Metal–Organic Cages for Desalination

Cited by 46 publications

References 46 publications

Bilayer versus Polymeric Artificial Water Channel Membranes: Structural Determinants for Enhanced Filtration Performances

Bilayer versus Polymeric Artificial Water Channel Membranes: Structural Determinants for Enhanced Filtration Performances

Strategies for the Construction of Functional Materials Utilizing Presynthesized Metal‐Organic Cages (MOCs)

Enhanced Desalination Polyamide Membranes Incorporating Pillar[5]arene through in‐Situ Aggregation‐Interfacial Polymerization‐isAGRIP

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