Construction of macroporous MOF-derived single leaf-like cellular skeleton for boosting advanced oxidation processes

Abstract

Macroporous cellular materials such as aerogels or foams have shown great practicability for adsorption, storage and separation. However, their three-dimensional (3D) monolithic forms with centimetre scale pose huge restrictions on rapid mass diffusion and the efficient exploitation of surface-active sites, hence limiting their efficiency for catalysis. Herein, we report a cellular NiCoO_V skeleton constructed from single macroporous ZIF-L (SM-ZIF-L) crystal. By nickel ion etching and annealing, the macroporous structure of SM-ZIF-L was further carved and stretched into cellular grooves. Simultaneously, bimetallic catalytic centres and oxygen vacancies (V_O) were generated as well. The fancy architecture thus provides fully accessible channels for excellent mass transportation, ion diffusion and maximizing exposure of active sites. Applied towards peroxymonosulfate (PMS)-based advanced oxidation processes (AOPs), our catalyst presents ultrafast catalytic kinetics with 100% organic clearance rate in 2 min, wide pH adaptability and cycle durability. The practicability was also validated in catalytic ultrafiltration and perfusion, which is promising for industrial water purification.