Abstract
The development of metal-organic frameworks (MOFs) based materials with specific structures and functions has important significance and application value in energy, environment, and material science. Herein, we developed a novel zinc-based MOF with 2-(4-carboxyphenyl)-1H-benzo[d]imidazole-5-carboxylic acid (CBC) as ligand, Zn-CBC, which exhibited large surface area, porous structure, and blue fluorescence. The material was demonstrated for simultaneous visual detection and removal of oxytetracycline (OTC) as a dual-functional platform. With the introducing of OTC that can be adsorbed by the surface group of Zn-CBC, the fluorescence emission intensity centered at 472 nm was significantly decreased attributed to the internal filtering effect (IFE) between OTC and Zn-CBC. In addition, due to the aggregation-induced emission (AIE) of OTC in the porous structure of Zn-CBC, a new fluorescence emission maximum at 540 nm appeared, which constructed a blue to yellow-green ratiometric fluorescence system. Combing the optical and adsorption properties of Zn-CBC, we innovatively prepared Zn-CBC MOF-alginate-Ca2+-polyacrylic acid polymer beads (MACPs) for sensing and removing of OTC in real water samples, which showed wide applicability in practical applications.
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