Dual-Emitting Dyes-CDs@MOFs for Selective and Sensitive Identification of Antibiotics and MnO4− in Water
It is highly challenging to blossom a novel fluorescent material that quickly and credibly differentiate polluting ions or organic matters in water monitoring. Here, a dual-emissive fluorescent platform based on the novel RhB-CDs@1 (RhB=rhodamine B, CDs=carbon dots, 1=[Cu2L(OH−)]n, L=1,3-bis(4'-carboxylic acid benzyloxy)benzoic acid) composite is constructed by introducing the CDs and RhB into the metal−organic frameworks (MOFs). The RhB-CDs@1 probe acts as a dual-emitting ratio sensor that not only avoids the errors caused by environmental and instrumental instability, but also has the advantages of MOF which can aggregate the analytes. Interestingly, this probe has different responses to different types of antibiotic, especially shows rapid and sensitive identification of quinolones, tetracyclines and nitrofurans in water (The detection limit as low as 25 ppb for ciprofloxacin; 44 ppb for norfloxacin; 65 ppb for nitrofurazone; 74 ppb for nitrofurantoin and 777 ppb for tetracycline). Similarly, an efficient ratiometric fluorescent probe for MnO4− is designed, bases on different fluorescence responses to the MnO4− ions in different acid and base conditions (MnO4−, H+ and OH−), Boolean logic operation is constructed. All of these indicate that the RhB-CDs@1 probes have merits of outstanding specific surface area and strong molecular/ionic recognition that are promising for the simultaneous selective recognition and detection the antibiotics or MnO4−, providing application prospects for monitoring water quality.