可视化黄色荧光石油焦基碳量子点高效检测Cu2+

Yellow-visual fluorescent carbon quantum dots from petroleum coke for the efficient detection of Cu2+ ions

    摘要
  • 摘要: 以石油焦为碳源,采用超声辅助的化学氧化法直接制备可视化黄色荧光碳量子点(CQDs)。作为非标记的探针,该CQDs无需任何修饰即可成功用于实际水样中Cu2+的检测。该荧光探针制备方法简单、经济,可快速响应(3 s),具有良好的选择性、灵敏性和可重复利用性,并且可实现"混合即检测"的快速检测目的。其线性检出范围较宽,为0.25~10 μmol/L,检出限为0.029 5 μmol/L。光诱导电子转移机理可很好地解释Cu2+猝灭CQDs的过程,本文提出的CQDs-Cu2+-EDTA "off-to-on"检测机理为金属离子荧光探针的开发奠定了理论基础。石油焦基CQDs在实际水样Cu2+的检测中具有快速响应性,在实际传感器应用领域具有很好的实际应用价值。

     

    Abstract: Yellow-visual fluorescent carbon quantum dots (CQDs) were prepared from petroleum coke by ultrasonic-assisted chemical oxidation andwere used as label-free probes for Cu2+ detection in water. The detection of Cu2+ by CQD probesis related to a quenching of fluorescence by a photo induced electron transfer mechanism. The quenched fluorescence of the CQDs by Cu2+ can be recovered by adding ethylene diaminetetraacetic acid.The yellow-visual fluorescent CQD probes have a linear detection range from 0.25 to 10 μM, a detection limit of 0.029 5 μM, a response time of 3 s, and a superior sensitivity and selectivity for Cu2+ detection compared to other fluorescent probes. The CQDs are easy to prepare, economical, reusable, fast to respond and can be used inon-line detection.

     

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