Copper nanoparticles supported on magnetic functionalized chicken feather‐derived activated carbon/metal–organic frameworks nanocomposite: As an efficient adsorbent for the removal of methylene blue and a unique heterogeneous catalyst for the synthesis of tetrahydrobenzo[b]pyran derivatives

Abstract

A Fe3O4@activated carbon‐COOH (Fe3O4@CFC‐COOH) was prepared via carboxyl‐functionalization of the activated carbon derived from feather waste, followed by co‐precipitation of Fe2+ and Fe3+ under alkaline conditions. This hybrid organic–inorganic porous compound was applied for in‐situ synthesis of TMU‐16 metal–organic framework and, subsequently, further engaged as support for immobilizing of Cu nanoparticles. The multi‐application of the as‐synthesized nanocomposite was investigated in the synthesis of tetrahydrobenzo[b]pyrans derivatives and the removal of methylene blue from aqueous media. The maximum absorption percentage (Re) for the removal of methylene blue was 96%. The adsorption process fitted well with the Freundlich model and has followed the pseudo‐second‐order kinetic model. Also, the Fe3O4@CFC‐COOH@TMU‐16@Cu exhibited high catalytic activity in the synthesis of tetrahydrobenzo[b]pyran derivatives with a wide range of aldehydes bearing electron‐donating and electron‐withdrawing groups.

Cu@CuFe2O4 nanoparticles catalyzed oxidative functionalization of alkynes: Access to α,α‐dichloro ketones

“…[43][44][45][46][47] Therefore, detailed studies on their catalytic applications for both academics and industry are highly in demand. [48][49][50] Given the aforementioned status and challenges, there is an urgent need to develop effective methods including easily isolated and reusable catalysts to simplify the preparation of α,α-dihalogenones. Based on our prior success in alkynes transformation [51][52][53][54][55] and the utilization of magnetic nanoparticles as catalysts in alkyne functionalization, 56 we herein present a novel heterogeneous catalytic system with Cu@CuFe 2 O 4 nanoparticles as catalyst, readily available N-Chlorosuccinimideas the chlorine source and general strategy for the straight preparation of α,α-dichloroketones utilizing both terminal and internal alkynes (Scheme 1d).…”