Nitrogen-doped carbon dots (N-CD) with green fluorescence were synthesized for Ag+ detection by one-step hydrothermal reaction using natural biomass Qiamagu (Brassica rapa) as carbon source and ethylenediamine as nitrogen source.The optimal synthesis conditions of N-CD were determined by single-factor experiment.The microscopic morphology,structure and elemental composition of N-CD were characterized by transmission electron microscopy,X-ray polycrystalline diffractometer,X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy.Additionally,the antioxidant properties of N-CD were investigated.The results showed that the N-CD prepared under the optimal synthesis conditions had a spherical morphology with an average particle size of (2.76±0.48)nm,and its fluorescence quantum yield reached 52.4%.The bursting of N-CD by Ag+ was a static bursting.The N-CD possessed a good radical-scavenging activity,and the scavenging rate of N-CD at the N-CD mass concentration of 0.03～0.36mg/mL against the radical 2-2-diphenyl-1-picrylhydrazyl was increased from 25.76% to 90.19%.The N-CD synthesized by a one-step hydrothermal method showed efficient selectivity for Ag+,while retaining the antioxidant activity of Qiamagu,expanding the application potential of Qiamagu.
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基金资助
新疆维吾尔自治区自然科学基金(2022D01A18)
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