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 mu M-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.

The design of a simple and efficient fluorescent probe for detecting hypochlorite (ClO-) is of great importance. Herein, we synthesized the hydroxyl-functionalized UiO-66 (UiO-66-(OH)(2)) by the solvothermal method and its derivative aluminium ion-modified UiO-66-(OH)(2) (Al3+@UiO-66-(OH)(2)) as two fluorescence probes are used for detecting ClO- in the water. The results showed that UiO-66-(OH)(2) has excellent fluorescent response ability for ClO- in water. Aluminium ion-modified UiO-66 (Al3+@UiO-66-(OH)(2)) displayed its high efficiency for the fluorescence detection of ClO- with a response time of 30 s and extraordinary limit of detection of 1.63 mu M in water. Moreover, the sensing of ClO- using easily portable Al3+@UiO-66-(OH)(2)-coated paper strips is also developed. Furthermore, the plausible fluorescence sensing mechanism of UiO-66-(OH)(2) for ClO- in aqueous solution was also discussed.

Herein, effective optical band gap engineering of a robust Zr12 oxo-based hcp UiO-66 has been realized through linker functionalization.

MAPbBr3 has a great prospect in various fields, due to excellent fluorescence quantum efficiency, band gap tunable and short of fluorescence lifetime. However, the instability of MAPbBr3 seriously impedes its application. Herein, the MAPbBr3 embedded in Zinc-Cobalt binary zeolitic imidazolate framework (ZIF-8Cox%, x = 0?20) has been developed to fabricate MAPbBr3@ZIF-8Cox% for detecting Fe3+ in mixing various metal ions water. The investigation of concentration of doping Co2+ on the emission intensities of MAPbBr3@ZIF-8Cox% composite demonstrated that the concentration of 5% with Co2+ showed superior fluorescence intensity after 30 days in the water. The fluorescent sensing studies indicated that MAPbBr3@ZIF-8Cox% can detect Fe3+ ion in water with high sensitivity and selectivity even in the presence of other interfering metal ions including Fe2+ ion. Moreover, the potential fluorescence sensing mechanism of MAPbBr3@ZIF-8Cox% for Fe3+ ion in aqueous solution was also discussed.