Post-synthetic Modification of Covalent Organic Framework via Thiol-Ene Reaction for Improving Fluorescence Detection and Removal of Cationic Crystal Violet Carcinogenic Dye

Based on a thiol–ene reaction, a covalent organic framework containing olefins (COF-A) is modified with 2-mercaptoacetic acid to prepare COF-S-COOH for the first time, which greatly improves the sensing and adsorption capacity for crystal violet.