研究目的
To develop a green route for the conversion of waste polyethylene terephthalate (PET) to fluorescent carbon dots (CDs) for the selective and sensitive detection of ferric ion (Fe3+) and pyrophosphate anion (PPi).
研究成果
The study successfully demonstrated a green and low-cost method for converting waste PET into fluorescent CDs, which can be used for the selective and sensitive detection of Fe3+ and PPi. The CDs showed good PL stability and were effectively applied in real water samples and human urine, suggesting potential for environmental and biological sensing applications.
研究不足
The study does not address the scalability of the synthesis process for industrial applications or the long-term stability of the CDs under various environmental conditions.
1：Experimental Design and Method Selection
A two-step synthetic strategy involving air thermal oxidation and H2O2-assisted hydrothermal technique was designed for the conversion of waste PET to CDs.
2：Sample Selection and Data Sources
Waste plastic bottles made of PET were used as raw materials. The CDs were characterized using TEM, XRD, Raman spectroscopy, XPS, FTIR, UV-vis absorption, and PL spectroscopy.
3：List of Experimental Equipment and Materials
Plastic bottles, hydrogen peroxide (30 wt%), Iron (III) chloride, sodium pyrophosphate decahydrate, and other analytical grade reagents were used. Equipment included a JEM-2100 electron microscope, Bruker D8 Advance X-ray diffractometer, Renishaw inVia-reflex spectroscopy, AXIS ULTRA DLD spectrograph, Nicolet 6700 FTIR spectrometer, UV-3101PC spectrophotometer, Hitachi F-7000 spectrophotometer, nano Z zeta potential analyzer, and a spectroscope.
4：Experimental Procedures and Operational Workflow
CDs were fabricated by air oxidation of waste PET followed by hydrothermal treatment in aqueous H2O2 solution. The CDs were then used for the detection of Fe3+ and PPi through fluorescence quenching and recovery processes.
5：Data Analysis Methods
The PL spectra were recorded to analyze the quenching and recovery effects. The Stern-Volmer equation was used to determine the quenching constant. The selectivity and sensitivity of the CDs towards Fe3+ and PPi were evaluated.
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