Morphological control of covalent organic frameworks in a PEG–H₂O system

Abstract

Covalent organic frameworks (COFs), as an emerging crystalline porous material, have drawn considerable attention in many fields. Therefore, facile preparations of COFs using green and mild methods are necessary and...

Recent developments in bismuth oxyhalide-based functional nanomaterials for biomedical applications

“…The properties of nanomaterials depend primarily on their particular chemical and physical properties, which are principally affected by their morphology and size. 16 For instance, nanoflowers are more conducive to the separation, transfer, and effective utilization of charge carriers in chemical reactions than nanosheets and nanospheres. 17 BiOX nanomaterials have many morphologies, mostly including nanosheets, [17][18][19][20][21] nanospheres, 17,[22][23][24] nanoflowers, 17,25-27 cuboid-like structures, 28 lantern-like structures, 29 tremella-like structures, 30 and nanotubes.…”

Industry-compatible covalent organic frameworks for green chemical engineering

“…The preparation of COFs with regular morphology is very favorable for application in industrial development. Recently, Qiu and co-workers [55] reported a facile and environmentally friendly strategy to synthesize four COFs with different morphologies using polyethylene glycol 400 (PEG-400) and a water system as the green reaction medium (Figure 3c). In brief, TAPB and DMTP were dissolved in a mixture of PEG-400 and water without inert gas protection.…”

Nanoporous Sulfonic Covalent Organic Frameworks for Selective Adsorption and Separation of Lanthanide Elements

“…Covalent organic frameworks (COFs) are an emergent class of porous crystalline materials with periodical structures and definitive nanopores. , The important thing is that the structural properties of COFs are predictive and highly adjustable. With the ability to be customized for specific applications, it is also considered as a promising material for adsorption separation. − Ionic covalent organic frameworks (iCOFs) are a subset of COFs with electrically charged linkages within the framework or with side-chain attachments that contribute to specific properties, such as selective ion exchange, in comparison to neutral COFs. − In recent years, the design and synthesis of iCOFs have become a new research hotspot . And great progress has been made using iCOFs as the separation materials to selectively adsorb different ions, such as UO 2 2+ , 99 TcO 4 – , Cr 2 O 7 2– , and MnO 4 – . − However, the number and linkages of reported iCOFs, especially the direct synthesis method of anionic iCOFs, are limited.…”