N掺杂碳量子点的制备及在Hg^(2+)快速检测中的应用

Preparation and application of N-doped carbon quantum dots in rapid Hg^(2+)detection

以柠檬酸和丙烯酰胺为原料,通过一步水热合成法,合成了一种对Hg^(2+)具有单一且快速响应机制的新型蓝色荧光碳量子点(CDs)。通过傅里叶红外光谱仪和透射电子显微镜对其结构进行表征,发现该CDs平均粒径约为3.6nm,且表面有丰富的酰胺和羟基基团。探究了CDs的荧光性能,测试其对重金属离子的选择性、检测灵敏度、pH稳定性和猝灭响应时间。研究结果表明,该CDs对Hg^(2+)有优异的单一选择性,并能够在5min内实现快速响应。Hg^(2+)的检出限低至10.0nmol/L,并在0.1~25μmol/L较宽的浓度范围内具有线性响应,且猝灭率达到65%。制备的新型CDs可方便快速地实现对不同pH水样中Hg^(2+)的特异性识别和检测。

A novel blue fluorescent carbon quantum dots(CDs)with a single and rapid response mechanism to Hg^(2+)was prepared by one-step hydrothermal method taking citric acid and acrylamide as raw materials.The structure of CDs was characterized by Fourier infrared spectroscopy and transmission electron microscopy.It was found that the average size of the CDs was about 3.6nm,and CDs had abundant amide and hydroxyl groups on the surface.The fluorescence properties of the CDs were studied,and their selectivity,detection sensitivity,pH stability and quenching response time to heavy metal ions were tested.The results showed that the CDs had a good single selectivity for Hg^(2+)and achieved a rapid response within 5 minutes.The detection limit of Hg^(2+)was as low as 10.0nmol/L and had a linear response over a wide concentration range from 0.1 to 25μmol/L,with a quenching rate of up to 65%.The prepared novel CDs could easily and quickly achieve the specific identification and detection of Hg^(2+)in water samples with different pH values.