Construction of two-dimensional fluorescent covalent organic framework nanospheres for the detection and removal of tetracycline

The abuse of tetracycline (TCH) leads to a large number of residues in water and agricultural products, which poses a serious threat to the ecological environment and human health. Therefore, it is necessary to develop materials that can simultaneously detect and effectively remove tetracycline. In this paper, we designed and synthesized a two-dimensional fluorescent covalent organic framework nanosphere (ETTA-Nap-COF) for the detection and efficient removal of tetracycline. Due to the efficient photoinduced electron transfer (PET) between ETTA-Nap-COF and TCH, a significant fluorescence enhancement of the COF material could be observed in the presence of TCH under UV light illumination, thereby realizing a selective and sensitive fluorescence sensing of tetracycline. At the same time, the combination of π-π stacking and the porous network structure of ETTA-Nap-COF is conducive to the efficient adsorption and removal of tetracycline, and the maximum adsorption capacity can reach 457.72 mg/g. The ETTA-Nap-COF material has good recyclability and high structural stability. Our work provides a new research idea for fluorescence detection and efficient removal of tetracycline.