Construction of hierarchically porous monoliths from covalent organic frameworks (COFs) and their application for bisphenol A removal

Journal of Hazardous Materials
Zhongshan LiuMingliang Ye

Abstract

Subject to synthetic conditions, covalent organic frameworks (COFs) are usually in powder form. Herein, taking an azine-linked COF as an example, detailed characterizations indicated that accessible aldehyde groups and hydrazine groups (CNNH2, 88 μmol g-1) concurrently existed on its surface. Intrigued by such feature, we have developed an approach based on ring-opening polymerization to shape COF powder into monoliths. The crystallinity and micropore of COF in monoliths were well remained, meanwhile, the ring-opening polymerization remarkably generated macropores ranging from 0.43 to 3.51 μm, indicating a hierarchically porous structure. The BET surface area of resultant monoliths with different COF mass fractions of 16%, 28% and 43% ranged from 105 to 281 m2 g-1. Due to the π-π interaction and hydrogen bond interaction, COF-based monoliths exhibited strong retention and rapid adsorption for bisphenol A (BPA) in aqueous medium. When 29 mL BPA solution (22.8 mg L-1) passed through COF-based monolith (28%), the adsorption capacity was up to 61.3 mg g-1. Furthermore, the COF-based monolith demonstrated excellent cycle use for catalyzing Suzuki-Miyaura coupling reaction after being coordinated with palladium acetate.

Citations

Jan 18, 2019·Chemistry : a European Journal·Soraia P S FernandesLaura M Salonen
May 26, 2020·Angewandte Chemie·Frederik HaaseStefan Wuttke
Aug 24, 2020·Environmental Science and Pollution Research International·Vinod KumarSwayangSiddha Nayak
Mar 17, 2021·Angewandte Chemie·Jesús Á Martín-IllánFélix Zamora
Jan 23, 2020·Chemical Reviews·Keyu GengDonglin Jiang

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