Preparation of functional material layers of TT-COFs with built-in formyl groups for efficient dyes removal

Wang, Qiaomu; Wang, Dongni; Liao, Qiaobo; Ke, Can; Zhang, Yiying; Han, Qingwen; Jiang, Dechen; Xi, Kai

doi:10.1016/j.jcis.2021.12.170

Cited by 10 publications

(6 citation statements)

References 55 publications

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“…[ 15 ] Interestingly, abundant aldehyde functional groups are still built into the pores of D‐ [4+3] COFs, as the characteristic peak (CO) at 1700 cm −1 (FTIR) and 191 ppm (NMR) remained. [ 16 ] On one hand, due to the special frame structure (Scheme 1), large numbers of free formyl groups exist in the pores of pristine COFs. [ 17 ] On the other hand, deformed topology and reduced stacking of D‐ [4+3] COFs are favorable to expose the active groups more fully.…”

Section: Resultsmentioning

confidence: 99%

In Situ Deformation Topology of COFs with Shortened Channels and High Redox Properties for Li–S Batteries

Wang

Tang

Liao

et al. 2022

Adv Funct Materials

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Covalent organic frameworks (COFs) with various topologies are typically synthesized by selecting and designing connecting units with rich shapes. However, this process is time-consuming and labour-intensive. Besides, the tight stacking of COFs layers greatly restrict their structural advantages. It is crucial to effectively exploit the high porosity and active sites of COFs by topological design. Herein, for the first time, inducing in situ topological changes in sub-chemometric COFs by adding graphene oxide (GO) without replacing the monomer, is proposed. Surprisingly, GO can slow down the intermolecular stacking and induce rearrangement of COFs nanosheets. The channels of D-[4+3] COFs are significantly altered while the stacking of periodically expanded framework is weakened. This not only maximizes the exposure of pore area and polar groups, but also shortens the channels and increases the redox activity, which enables high loading while enhancing host-guest interactions. This topological transformation to exhibit the structural features of COFs for efficient application is an innovative molecular design strategy.

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Section: Resultsmentioning

confidence: 99%

In Situ Deformation Topology of COFs with Shortened Channels and High Redox Properties for Li–S Batteries

Wang

Tang

Liao

et al. 2022

Adv Funct Materials

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“…29,30 Furthermore, the stronger C�O peak at approximately 1700 cm −1 and 191 ppm is attributed to formyl, indicating the formyl-functionalized pores in aerogel. 31 The crystal structure of Agel-COF[4 + 3]-CHO was characterized using PXRD and verified by Materials Studio (Figure 2d,e In plastic regions, stress and strain are nonlinearly correlated. As seen from the unloading curve, the stress returns to zero when strain still exists, indicating irreversible deformation during compression.…”

Section: Preparation and Characterization Of Agel-cof[4 + 3]-chomentioning

confidence: 99%

Design of High-Performance Formyl-Functionalized COF Aerogels as Quasi-Solid Lithium Battery Electrolyte by a Solvent Substitution Strategy

Wang,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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Covalent organic framework (COF) aerogels with functional groups offer exceptional processability and functionality for various applications. These hierarchical porous materials combine the advantages of COFs with the benefits of aerogels, overcoming the limitations of conventional insoluble and nonfusible COF powders. However, achieving both high crystallinity and shape retention remains a challenge for functionalized COF aerogels. In this work, we develop a novel and general solvent substitution method for the one-step synthesis of formylfunctionalized COF aerogels without harsh vacuum conditions. These aerogels exhibit excellent processing capabilities, superior mechanical strength, and enhanced functionality. As a proof-of-concept, they were used in adsorption and lithium metal battery applications, significantly maximizing the structural advantages of COFs, e.g.: (i) the hierarchical porous structure is fully wetted by the electrolyte to form continuous transport channels; (ii) the polar groups, which are easier to be acquired, help in desolvation and transfer of Li + ; (iii) the regular pore structures stabilize deposition of Li + and inhibit the growth of lithium dendrites. These combined benefits contribute to a lighter battery with improved energy density and enhanced safety.

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“…Xi and coworkers combined C 3 ‐symmetrical triazine‐based monomers with C 2 ‐symmetrical tetraphenylethylene‐based units to fabricate sub‐stoichiometric tetratopic‐tritopic COFs (TT‐COFs) containing reactive formyl groups. [ 38 ] TT‐COFs were also combined with graphene oxide to give TT‐COFs/GO composite membranes with a high rejection of 99.5% and a large flux of 309.99 L m −2 h −1 bar −1 for dye removal applications. Recently, the same group introduced an in situ topological modification approach to introduce graphene oxide (GO) into sub‐stoichiometric COFs without the need for monomer replacement.…”

Section: Sub‐stoichiometric Cofs‐based Compositesmentioning

confidence: 99%

Sub‐Stoichiometric Covalent Organic Frameworks

Qian,

Li,

Teo

et al. 2024

Adv Funct Materials

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Covalent organic frameworks (COFs) have garnered significant attention for nearly two decades due to their exceptional structural designs, tunable properties, and wide‐ranging applications. Recently, a novel subclass of COFs known as partially condensed, sub‐stoichiometric COFs (ss‐COFs) has emerged. This presents a promising new avenue for constructing distinct COF structures in contrast to fully condensed, stoichiometric COFs (fc‐COFs). ss‐COFs are deliberately designed with periodic unreacted functional groups, thereby giving rise to intriguing electronic, optical, and catalytic properties. The deviation from conventional stoichiometric approach opens up new prospects to tailor material properties for unexplored applications. Here, this review focuses on the latest advancements and breakthroughs in ss‐COFs, including topological design, structure characterization, synthetic method, and practical applications. From their basic designing principles to cutting‐edge properties, it will be explored how ss‐COFs are paving the way for COFs research and pushing the boundaries toward new scientific and technological possibilities.

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Preparation of functional material layers of TT-COFs with built-in formyl groups for efficient dyes removal

Cited by 10 publications

References 55 publications

In Situ Deformation Topology of COFs with Shortened Channels and High Redox Properties for Li–S Batteries

In Situ Deformation Topology of COFs with Shortened Channels and High Redox Properties for Li–S Batteries

Design of High-Performance Formyl-Functionalized COF Aerogels as Quasi-Solid Lithium Battery Electrolyte by a Solvent Substitution Strategy

Sub‐Stoichiometric Covalent Organic Frameworks

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