| Abstrakt: |
Graphene quantum dots (GQDs) are a distinct type of fluorescent material with zero dimensions and are highly valued for their exceptional quantum confinement, optical size, and characteristics. A simple alkaline hydrothermal process achieved a surface modification of Graphene Quantum dots (GQDs) with Luminol to enhance the fluorescence emission and hence the better limit of detection. Their structural information was obtained using Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), photoluminescence spectroscopy, X-ray diffraction (XRD), and UV-Vis absorption spectroscopy. The results demonstrated that the GQDs had a consistent size distribution ranging from 6 to 18 nm and possessed an abundance of nitrogen-containing functional groups. The modified graphene quantum dot (GQD) has significant optical characteristics, including a tenfold increase in fluorescence intensity. The altered graphene quantum dots (GQDs) were employed to detect ferrous ions (Fe3+) in an aqueous solution. It exhibits remarkable selectivity for (Fe3+) compared to other metal ions in an aqueous solution. The fluorescence intensity exhibited an inverse relationship with the concentration of (Fe3+) ions. The calibration curve displayed linear regression (R2) within the given concentration range of 0.21–300 µMolar. The detection limit was determined to be 0.08 µM. The results demonstrate that Luminol-GQDs, functioning as a photoluminescence sensing platform, possess the necessary selectivity for environmental applications and can effectively detect (Fe3+) ions in the presence of other ions in aqueous samples. |
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