Phenylboronic acid functionalized high-crystallinity fluorescent covalent organic framework act as a sensing platform with dual performance for rifamycin antibiotics and water and adsorbent for rifamycin antibiotics

Phenylboronic acid functionalized high-crystallinity fluorescent covalent organic framework ( [email protected] ), which can be applied for rifamycin antibiotics and water sensing, and for rifamycin antibiotics adsorption, was synthesized for the first time. To effectively form [email protected] by post-synthetic modification, a fluorescent COF (COF–OMe) was prepared using deep-eutectic solvent as solvent without using catalyst. The [email protected] showed good fluorescence property and adsorption capacity, which owned superior effects in detecting and adsorbing rifampicin, rifapentine, and rifabutin. The results of fluorescence quenching mechanisms showed that internal filtration effect, dynamic quenching, and photoinduced electron transfer were the major mechanisms. Moreover, mainly due to the pore selectivity of [email protected] , hydrogen bonding, and π-π interaction, [email protected] showed good selectivity for three antibiotics. Finally, a dual-function platform based on [email protected] was successfully developed for sensing and adsorbing three antibiotics from various samples. Besides, [email protected] also showed good effect to detect water amount in ethanol (0.1−50%, v/v).