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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Cu~(2+)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0.25~10μmol/L,检出限为0.029 5μmol/L。光诱导电子转移机理可很好地解释Cu~(2+)猝灭CQDs的过程,本文提出的CQDs-Cu~(2+)-EDTA“off-toon”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Cu~(2+)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。
Petroleum coke as a carbon source, the use of ultrasound-assisted chemical oxidation of direct preparation of visual yellow fluorescent carbon quantum dots (CQDs). As a non-labeled probe, the CQDs can be successfully used for the detection of Cu 2+ in actual water samples without any modification. The fluorescent probe is simple and economical to prepare, fast response (3 s), has good selectivity, sensitivity and reusability, and can achieve the purpose of rapid detection of “mixed and detected”. The linear detection range of a wide range of 0.25 ~ 10μmol / L, the detection limit of 0.029 5μmol / L. The photoinduced electron transfer mechanism can explain Cu2 + quenching of CQDs well. The detection mechanism of CQDs-Cu ~ (2 +) - EDTA "off-toon The development laid the theoretical foundation. The petroleum coke base CQDs has fast response in the real water sample Cu 2+ detection and has good practical application value in practical sensor applications.