Preparation of doped Mn, N-CDs and their application in the detection of ampicillin

In this study, a one-step hydrothermal method was employed to synthesise highly fluorescent carbon quantum dots (Mn, N-CDs), incorporating the metallic element manganese (Mn) and the non-metallic element nitrogen (N). Banana peels and potassium permanganate were utilised as the raw materials. Characterisation methods were used to investigate the structure and properties of the Mn, N-CDs, revealing that they exhibited excellent fluorescence performance. The Mn, N-CDs was then applied as a fluorescent probe for penicillin detection, revealing that it significantly affected the fluorescence intensity of the Mn, N-CDs via a static quenching mechanism. Furthermore, the concentration of ampicillin sodium exhibited a strong linear relationship within the range of 0.05-20 µg/mL. Furthermore, antibiotics in environmental wastewater were analysed and spiked recovery experiments were performed. The results showed that ampicillin sodium recovery was 96.0-98.20%, with an RSD of less than 2.41%. In summary, this method provides a novel nanosensing platform for the rapid detection of antibiotic residues, with potential applications in environmental testing.