Visualizing stimulus-responsive dual-ligand fluorescent probe for hypochlorite: A novel strategy for real application in tap water.

As an effective ingredient of disinfectant, ClO - inevitably remains in the water, which induces potential health hazards including lung damage, kidney disease. Herein, stimulus-responsive dual-ligand luminol-Tb-GMP coordination polymer nanoparticles (luminol-Tb-GMP CPNPs) were prepared as highly selective fluorescent probes for the real-time and visual detection of ClO - . CPNPs consisted of Tb 3+ as a nuclear metal coordinating with GMP and luminol as an auxiliary ligand. In the presence of ClO - , GMP can be oxidized by ClO - to damage its structure, resulted in the fluorescence quenched of CPNPs. The two-ligand CPNP sensor has fast fluorescence response, significant fluorescence color change and high sensitivity, with a linear range of 2 to 18 μM and a detection limit of 0.14 μM. It has been successfully applied to the detection of ClO - in tap water, fountain water and drinking water. At the same time, the portable filter paper strip was prepared to expand the range of applications outside the laboratory, which will provide a promising application for the real-time and semi-quantitative analysis of ClO - .