This research looked at the electrochemiluminescence (ECL) signals of two quinolones: Enoxacin (Enox) and Nadifloxacin (Nadf), which were investigated in H3BO3-Na2B4O7 buffered solutions containing the co-reactant K2S2O8. Based on the fluorescence (FL) spectra, ECL spectra, and corresponding ECL experiments, a possible mechanism of the ECL reaction was proposed. The effect of experimental conditions on quinolone ECL behavior was studied and optimized, so we revealed the value of organic molecules as ECL luminophores. According to calculations, Nadifloxacin has a smaller LUMO-HOMO band gap than Enoxacin, making it more suitable for use as a luminophore. Furthermore, we discovered a quenching effect of lead ion (Pb2+) on the ECL signal of Nadifloxacin, and we focused on the Pb2+ quenching mechanism in this system and made reasonable guesses. We invented a novel technique for ECL detection of Pb2+ with high sensitivity and selectivity. This method demonstrates the potential application of ECL in pollution management.
Binary transition metal oxides (BTMOs) have drawn considerable attention in recent years for their excellent catalytic properties and chemical stability in the sensing field. Regrettably, the loss of active site exposure originating from the agglomerate during preparation largely restricted their sensing applications. In this work, we report an efficient strategy for advancing the performance of BTMOs in rapid detection based on a 3D molybdenum disulfide nanoflower. The larger surface area, multiple active site exposures, and higher electrical conductivity promote the dispersion of BTMOs and the redox reaction of analytes on the surface of nanocomposites, thereby enhancing the sensitivity and widening the quantitative range. As a proof-of-method application, ferric vanadate (FeVO4) and ciprofloxacin (CIP) were chosen as model catalysts and analytes, respectively. This approach exhibits excellent sensitivity, selectivity, repeatability, and stability. The detection limit could be as low as 26.6 nM, and the linear range covered 3 orders of magnitude (from 0.1 to 500 μM). It also demonstrated good practicality in milk, honey, and drinking water with a recovery of 90.6% to 100.8%. To our knowledge, this is the first report on incorporating MoS2 into BTMOs for augmenting sensing performance in rapid detection.
危险品化学品经营许可证（带存储）