石榴汁碳量子点的制备及其在铁离子检测和抑菌方面的应用OA

Carbon quantum dots(CQDs)are a type of nanomaterial with excellent luminescent prop‑erties and have promising applications in various fields.Green fluorescent carbon quantum dots(g-CQDs)were synthesized by a solvothermal method using pomegranate juice as the carbon source and absolute ethanol as the solvent.The structure and optical properties of g-CQDs were characterized by UV-Vis absorption,fluorescence spectroscopy,FTIR and TEM.The results showed that g-CQDs had an average particle size of approximately 2.96 nm,with abundant surface functional groups such as hydroxyl and carboxyl groups,exhibiting good water dispersibility and fluorescence stability.Un‑der excitation at 410 nm,g-CQDs emit green fluorescence at 500 nm with a quantum yield of 15.24%.The fluorescence of g-CQDs was quenched by Fe3+and Fe2+,and the quenching mechanism mainly involves photo-induced electron transfer resulting from surface coordination.The detection limits of Fe2+are 0.155 μmol/L(linear range 1.25-18 μmol/L)and 0.221 μmol/L(linear range 18-50 μmol/L),respectively.The detection limit of Fe3+within the linear range of 2.5 to 72.5 μmol/L is 0.211 μmol/L.It can be concluded that g-CQDs has sensitivity for Fe3+and Fe2+.The antibacterial experiments indicated that g-CQDs exhibited inhibitory effects on mold growth,with the antibacteri‑al activity increasing at higher concentrations.This study provides a reference for the green synthesis of multifunctional CQDs and their applications in ion detection and antibacterial fields.