Surface post-functionalization of COFs by economical strategy via multiple-component one-pot tandem reactions and their application in adsorption of pesticides

The economical and convenient one-pot approach plays a substantial role in chemical synthesis and material design. However, the related reports on the synthesis and functionalization of covalent organic frameworks (COFs) by the one-pot approach are limited. Herein, we selectively introduced three different functional groups (fluoroalkyl, borate, and alkyl groups) to verify that the multi-component one-pot tandem reaction could be applied into surface post-functionalization of COFs as an economical strategy. After proving the practicability of the economical strategy, we also prepared two kinds of fluorine-containing COFs (COF-F0.5 and COF-F) and butyl-containing COF (COF-Bu) via the economical strategy to explore the effect of COF nature (porosity and the number of functional groups) on fipronil adsorption. The results showed that COF-F0.5 possessing the largest Brunauer–Emmett–Teller (BET) specific surface area (1573 m2 g−1) exhibited a larger saturated adsorption capacity (194.7 mg g−1) than COF-F (149.8 mg g−1). Furthermore, comparing with COF-Bu (122.4 mg g−1), COF-F (149.8 mg g−1) containing functional groups showed a greater adsorption capacity. Post-functionalization of covalent organic frameworks by multiple-component one-pot tandem reactions was reported and the related application in the adsorption of pesticides was also studied.