A novel fluorescence probe based MAPbBr3@ZIF-8 for detecting hypochlorite in water samples

The extensive use of hypochlorite (ClO−) as oxidant and bleach has drawn serious concern due to their adverse environment and biological impact. Herein, a novel fluorescence probe composite material based on MAPbBr3@ZIF-8 was prepared by agitation method in room temperature, using lead bromide, armour ammonia bromine, 2-methylimidazole and zinc acetate as precursors. MAPbBr3@ZIF-8 composites exhibited remarkable stability in NaCl aqueous solution and UV lamp. Thus, the MAPbBr3@ZIF-8 composites were successfully used as a fluorescence probe for detection of ClO− via electron transfer and dynamic quenching mechanism. The fluorescence probe can detect ClO− in water with high selectivity even existed other anions (HCO3−, SO42−, Cl−, SiO32−, CO32−, NO3−, HSO3−). Meanwhile, the response time of the MAPbBr3@ZIF-8 probe could be obtained to less than 40 s. The detection limit and quenching constant were calculated as 31.9 nM and 0.141 µM−1. Furthermore, the fluorescence probe sensor showed excellent stability in natural environment with 94.6%-100.6% recovery rates. The fluorescence probe based MAPbBr3@ZIF-8 composites in this study is promising for detecting ClO− anion in water.