研究目的
Developing a highly selective and sensitive electrochemical sensor for toxic mercury ions utilizing carbon quantum dot-modified glassy carbon electrode.
研究成果
The CQD-modified GCE exhibits improved electrocatalytic activity towards Hg with a wide linearity range and low detection limit. The sensor demonstrates excellent selectivity, stability, and reproducibility, making it a promising tool for environmental monitoring of Hg ions.
研究不足
The study focuses on the detection of Hg ions in aqueous solutions and may require further validation for complex environmental matrices. The stability of the CQD-modified electrode decreases slightly over time.
1：Experimental Design and Method Selection:
The study involved the synthesis of carbon quantum dots (CQDs) from activated carbon obtained from coconut shell through chemical oxidation method. The CQDs were characterized using FT-IR, HR-TEM, XRD, and UV–Vis analysis. The electrochemical sensing of Hg ions was performed using cyclic voltammetry (CV) and differential pulse voltammetry (DPV).
2：Sample Selection and Data Sources:
Activated carbon was prepared from coconut shells. The synthesized CQDs were used to modify the glassy carbon electrode (GCE) for Hg ion detection.
3：List of Experimental Equipment and Materials:
Instruments used include FT-IR spectrophotometer, HR-TEM, XRD unit, UV–Vis spectrophotometer, and CHI electrochemical workstation. Chemicals included activated carbon, HNO3, and various metal ions for interference studies.
4：Experimental Procedures and Operational Workflow:
The GCE was polished and modified with CQDs via drop casting. Electrochemical measurements were conducted in phosphate buffer solution (PBS) with varying concentrations of Hg ions.
5：Data Analysis Methods:
The electrochemical responses were analyzed to determine the linearity range, limit of detection, and selectivity against interfering ions.
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