A Superhydrophobic Trifluoromethyl‐Containing Covalent Organic Framework Membrane for Efficient Oil/Water Separation

Chu, Jia-Qi; Lu, Ya; Gan, Shi-Xian; Qi, Qiao-Yan; Jia, Chao; Yao, Jin; Zhao, Xin

doi:10.1002/marc.202200641

Cited by 15 publications

(4 citation statements)

References 37 publications

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“…The weaker crystallinity may cause the smaller pore volume of TbTFMB. Compared with TpBD, TpTFMB showed worse crystallinity, likely due to the steric effect from the large group of −CF 3 , but larger specific surface area and pore volume, probably owing to the self-complementary π-electronic interaction provided by the introduction of fluorine. − …”

Section: Resultsmentioning

confidence: 98%

Trifluoromethyl-Functionalized 2D Covalent Organic Framework for High-Resolution Separation of Isomers

Yang

et al. 2023

ACS Appl. Mater. Interfaces

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Development of novel functional materials for effective isomer separation is of great significance in environmental science, chemical industry, and life science due to the different functions of isomers. However, the similar physicochemical properties of isomers make their separation greatly challenging. Here, we report the fabrication of trifluoromethyl-functionalized 2D covalent organic framework (COF) TpTFMB with 2,2′-bis(trifluoromethyl)benzidine (TFMB) and 1,3,5-triformylphloroglucinol (Tp) for the separation of isomers. TpTFMB was in situ-grown on the inner surface of a capillary for the high-resolution separation of isomers. The introduction of hydroxyl and trifluoromethyl functional groups with uniform distribution in 2D COFs is a powerful tactic to endow TpTFMB with various functions such as hydrogen bonding, dipole interaction, and steric effect. The prepared TpTFMB capillary column enabled the baseline separation of positional isomers such as ethylbenzene and xylene, chlorotoluene, carbon chain isomers such as butylbenzene and ethyl butanoate, and cis−trans isomers 1,3-dichloropropene. The hydrogen-bonding, dipole, and π−π interactions as well as the structure of COF significantly contribute to the isomer separation. This work provides a new strategy for designing functional 2D COFs for the efficient separation of isomers.

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Section: Resultsmentioning

confidence: 98%

Trifluoromethyl-Functionalized 2D Covalent Organic Framework for High-Resolution Separation of Isomers

Yang

et al. 2023

ACS Appl. Mater. Interfaces

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“…The chemical mechanism behind the enhanced chemical stability of fluorinated groups can be attributed to their special structural characteristics. The highly electronegative −CF 3 group has a large molecular cross‐sectional area with hydrophobic nature and low surface energy, [18a] thus forming a weak van der Waals force with water molecules [18b] . Moreover, fluorine atoms with high electronegativity produce electrostatic repulsion with the lone pair containing oxygen atoms, [18c] resulting in reduced water affinity and the destruction of its hydrogen bond network [18a] .…”

Section: Figurementioning

confidence: 99%

Fluorinated MOF‐Based Hexafluoropropylene Nanotrap for Highly Efficient Purification of Octafluoropropane Electronic Specialty Gas

Zheng,

Xue,

Yan

et al. 2024

Angewandte Chemie

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High‐purity octafluoropropane (C3F8) electronic specialty gas is a key chemical raw material in semiconductor and integrated circuit manufacturing industry, while selective removal of hexafluoropropylene (C3F6) impurity for C3F8 purification is essential but a challenging task. Here we report a fluorinated cage‐like MOF Zn‐bzc‐CF3 (bzc = 5‐(trifluoromethyl)‐1H‐pyrazole‐4‐carboxylic acid) for C3F6/C3F8 separation. The incorporation of ‐CF3 groups not only provides suitable pore aperture size for highly efficient size‐exclusive C3F6/C3F8 separation, but also creates hydrophobic microenvironments, endowing Zn‐bz‐CF3 high chemical stability. Remarkably, Zn‐bzc‐CF3 exhibits high C3F6 adsorption capacity while excluding C3F8, achieving ideal molecular‐sieving C3F6/C3F8 separation. Breakthrough experiments show that Zn‐bzc‐CF3 can efficiently separate C3F6/C3F8 mixture and high‐purity C3F8 (99.9%) can be obtained.

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“…The simple discharge of a large amount of oil-water mixture will not only cause resource waste and economic loss but also destroy the ecological environment and seriously endanger human health. Therefore, it is urgent to make proper disposal of used oil-water mixtures and solve the problem of pollution [2][3][4]. Generally, depending on the physical form of the impurity phase, oil-water mixtures should exist in three main forms: an immiscible oil-water mixture, a free oil-water emulsion, and an oil-water emulsion with a stable emulsifier ("oil-in-water" or "water-in-oil").…”

Section: Introductionmentioning

confidence: 99%

Nanostructure-Based Oil–Water Separation: Mechanism and Status

Wang,

Feng,

Wang

et al. 2023

Separations

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Flexible and effective methods for oil–water separation are crucial for reducing pollutant emissions and safeguarding water and fuel resources. In recent years, there has been growing interest in fundamental research and engineering applications related to water and fuel purification, especially oil–water separation. To date, filter materials with special wetting characteristics have been widely used in oil–water separation. Nanostructured materials are one of the most attractive candidates for next-generation oil–water separation. This review systematically summarizes the mechanisms and current status of oil–water separation using nanostructured materials. Basically, this can be achieved by using nanostructured materials with specific wettability and nanostructures. Here, we provide a detailed discussion of two general approaches and their filtration mechanisms: (1) the selective filtration technique, based on specific surface wettability, which allows only oil or water to penetrate while blocking impurities; (2) the absorption technique, employing porous sponges, fibers, or aerogels, which selectively absorbs impure oil or water droplets. Furthermore, the main failure modes are discussed in this review. The purposes of this article are: (1) to summarize the methods of oil–water separation by nanotechnology; (2) to raise the level of environmental protection consciousness of water pollution by using nanotechnology; (3) to tease out the features of different approaches and provide a pivotal theoretical basis to optimize the performance of filtering materials. Several approaches for oil and water separation are compared. Furthermore, the principle and application scope of each method are introduced.

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A Superhydrophobic Trifluoromethyl‐Containing Covalent Organic Framework Membrane for Efficient Oil/Water Separation

Cited by 15 publications

References 37 publications

Trifluoromethyl-Functionalized 2D Covalent Organic Framework for High-Resolution Separation of Isomers

Trifluoromethyl-Functionalized 2D Covalent Organic Framework for High-Resolution Separation of Isomers

Fluorinated MOF‐Based Hexafluoropropylene Nanotrap for Highly Efficient Purification of Octafluoropropane Electronic Specialty Gas

Nanostructure-Based Oil–Water Separation: Mechanism and Status

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