Uniform Growth of Nanocrystalline ZIF‐8 on Cellulose Nanocrystals: Useful Template for Microporous Organic Polymers

Abstract

AbstractZeolitic imidazolate framework (ZIF‐8) nanocrystals were uniformly grown on the surface of cellulose nanocrystals (CNCs) to give a hybrid material, ZIF@CNCs. By varying the stoichiometry of the components, it was possible to control the size of the ZIF‐8 crystals grown on the CNC surface. Optimized ZIF@CNC (ZIF@CNC‐2) was used as a template to synthesize a microporous organic polymer (MOP), ZIF@MOP@CNC. After etching the ZIF‐8 with 6 M HCl solution, a MOP material with encapsulated CNCs (MOP@CNC) was formed. Zinc coordination into the porphyrin unit of the MOP yielded the ship‐in‐a‐bottle structure, Zn MOP@CNC, comprised of CNCs encapsulated within the Zn‐MOP. In comparison to ZIF@CNC‐2, Zn MOP@CNC showed better catalytic activity and chemical stability for CO2 fixation, converting epichlorohydrin to chloroethylene carbonate. This work demonstrates a novel approach to create porous materials through CNC templating.