Metal organic frameworks as sacrificial templates for preparation of hierarchical covalent organic frameworks enabling ultrafast sample treatment in nontargeted food safety analysis

Covalent organic frameworks (COFs) hold great promises for various applications due to their porous morphology. However, interior pores often fail to play their roles because of inaccessibility. Herein, by using glycine to remove metastable metal–organic framework (MOF) from [email protected] that is prepared by in-situ growth of dual-pore COF on Cu-MOF surface, we report a new method to prepare a highly hierarchical COF (HCOF) containing...