Adsorption‐Driven Stimulus‐Responsive MOG‐Based Multifunctional Platform for Ratiometric Detection/Adsorptive Removal of Chlortetracycline Hydrochloride and Advanced Anti‐Counterfeiting Application

Abstract The majority of research has been limited to either the detection or adsorption of antibiotics owing to the challenges associated with the integration of multiple functions into a single material, leading to inefficient resource utilization. Herein, a novel Zirconium‐Europium‐Terbium ternary metal‐organic gel, namely ZET‐MOG, is synthesized by impregnation method and immobilized within sodium alginate (SA) matrix to form ZET‐MOG/SA beads. As adsorbents, the two materials display rapid kinetics, high adsorption capacity, and strong stability for chlortetracycline hydrochloride (CTC). It is speculated that pore filling, electrostatic interaction, hydrogen bonding, π – π interaction, coordination, and hydrophobic interaction jointly facilitate the efficient removal of CTC. As ratiometric fluorescence sensors, they offer fast response, high sensitivity, and excellent visualization degree. As multi‐mode anti‐counterfeiting platforms, varying the excitation light and CTC concentration allows ZET‐MOGs to be utilized for fingerprint identification and anti‐counterfeiting inks, while ZET‐MOG/SA beads are expected to be applied to QR codes and access cards. Moreover, combined with smartphones, ZET‐MOG/SA beads ensure data authenticity during real‐time monitoring and removal of CTC from honey samples and river water. In brief, the integrated innovative design strategy presented in this study brings new insights into water environment governance and safety management.