Rapid construction of hierarchically porous metal–organic frameworks by a spray‐drying strategy for enhanced tannic acid adsorption
Jingran Liu, Yan Wei, Miao Chang, Ni Wang, Dan Wang, Jie‐Xin Wang
Abstract
Abstract Metal–organic frameworks (MOFs) have attracted much attention owing to their tailored pore environment and surface functionality. However, most of the currently reported MOFs are confined to small pore sizes (<5 nm), limiting their practical applications. Here, a facile and versatile strategy for rapid construction of hierarchically porous MOFs (HP‐MOFs) by spray‐drying is reported, in which presynthesized nanosized MOFs (N‐MOFs) can be assembled to form MOF microspheres with meso/macropores resulting from the interspace among closely arranged N‐MOFs. This strategy enables the construction of multicomponent HP‐MOFs with various functions. As a proof of concept, we show that the adsorption for tannic acid (TA) can be significantly enhanced using HP‐MIL‐101(Cr). Particularly, HP‐MIL‐101‐30 (30 represents the primary nanoparticle size) exhibits a record‐high adsorption capacity (1175 mg g −1 ), and the adsorption rate of HP‐MIL‐101‐30 is increased by 50% compared to that of N‐MIL‐101‐30. These findings have important implications for the rapid construction of HP‐MOFs, which is beneficial for the adsorption of large molecules.