One stop detection platform towards TNP by a dual-channel hydrogel sensor with Eu-tcbpe and the preparation of a tunable fluorescent material

The development of TNP sensors for one-stop real-time detection is crucial for understanding water environments and maintaining human health and safety. However, one of the main obstacles that hindering the development of on-site detection technology in the future is the complexity of the detection environment. Here, in this work, a novel metal-organic framework (MOF) Eu-tcbpe designed with H 4 tcbpe (H 4 tcbpe = 4′,4‴,4‴,4′‴-(ethene-1,1,2,2-tetrayl)tetrakis(([1,1′biphenyl]-4-carboxylic acid))) and Eu 3+ was synthesized. This complex exhibited anti-interference, sensitive, and rapid detection capabilities with the limitation of detection of 0.42 mg/L for TNP. In order to realize real-time portable detection, a hydrogel sensing platform with Eu-tcbpe and methyl red was designed and prepared. This platform retains all the features of Eu-tcbpe . Combining it with smartphone can perform real-time detection towards TNP. It could be found that two independent colorimetric and fluorescent channels on the sensor exhibited specific responses to TNP under sunlight and fluorescence irradiation, respectively. Furthermore, by utilizing the principle of strong electrostatic interaction, the cationic dye safranin T (ST) was encapsulated into Eu-tcbpe with an anionic framework, achieving tunability of the fluorescence color of Eu-tcbpe . This work is expected to provide research ideas for advancing the detection of MOFs in fluorescence sensing and the practical application of MOFs as multi-color luminescent materials.