Portable and on-site electrochemical sensor based on surface molecularly imprinted magnetic covalent organic framework for the rapid detection of tetracycline in food

•A portable and on-site MMIECS was fabricated for the rapid detection of TC.•Fe3O4@COFs@MIPs was used as the sensing platform.•The Fe3O4@COFs@MIPs was coupled with disposable screen-printed electrode.•The MMIECS exhibited wide linear range, good sensitivity, selectivity, and applicability.•This is the first attempt of applying Fe3O4@COFs@MIPs in electrochemical sensing.