A novel blue fluorescent carbon quantum dots (CDs) with a single and rapid response mechanism to Hg2+ 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 Hg2+ and achieved a rapid response within 5 minutes.The detection limit of Hg2+ 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 Hg2+ in water samples with different pH values.
[1] 刘华东,徐浩轩,李合伟,等.氮硫掺杂碳量子点荧光探针检测Fe3+和Hg2+[J].郑州大学学报:工学版,2022,43(6):64-69.
[2] Li C H,Liu Y M,Lu B,et al.Toward high-performance and functionalized carbon dots:strategies,features,and prospects[J].Progress in Chemistry,2022,34(3):499-518.
[3] 曹丹,李永生.基于硅氮掺杂荧光碳点测定水样中痕量Hg(Ⅱ)[J].应用化工,2022,51(8):2473-2476.
[4] Bigdeli A,Ghasemi F,Abbasi-Moayed S,et al.Ratiometric fluorescent nanoprobes for visual detection:design principles and recent advances-a review[J].Analytica Chimica Acta,2019,1079:30-58.
[5] Anjana R R,Anjali Devi J S,Jayasree M,et al.S,N-doped carbon dots as a fluorescent probe for bilirubin[J].Mikrochimica Acta:An International Journal for Physical and Chemical Methods of Analysis,2018,185(1):11.
[6] Zhao C,Jiao Y,Hua J,et al.Hydrothermal synthesis of nitrogen-doped carbon quantum dots as fluorescent probes for the detection of dopamine[J].Journal of Fluorescence,2018,28(1):269-276.
[7] Ge H,Zhang K,Yu H,et al.Sensitive and selective detection of antibiotic D-penicillamine based on a dual-mode probe of fluorescent carbon dots and gold nanoparticles[J].Journal of Fluorescence,2018,28(6):1405-1412.
[8] Zheng X,Ren S,Wang L,et al.Controllable functionalization of carbon dots as fluorescent sensors for independent Cr(Ⅵ),Fe(Ⅲ) and Cu(Ⅱ) ions detection[J].Journal of Photochemistry and Photobiology A Chemistry,2021,417(482):113359.
[9] 齐海燕,孙晓娜,苏立强,等.水热法制备氮硫共掺杂碳点检测Cr(Ⅵ)[J].分析试验室,2022,41(8):886-893.
[10] 杜鹏,刘洁,曹丰.碳点的合成方法及其用于重金属离子检测的研究进展[J].化工新型材料,2022,50(6):37-42.
[11] 陈修阳,潘立志,盛同范,等.基于锰掺杂碳点的橘红色荧光纳米开关检测Cu2+和Arg的研究[J].现代化工,2022,42(11):249-255.
[12] Li L S,Jiao X Y,Zhang Y,et al.Green synthesis of fluorescent carbon dots from Hongcaitai for selective detection of hypochlorite and mercuric ions and cell imaging[J].Sensors and Actuators,2018,B263(JUN):426-435.
[13] 李淑雅,魏超,赵晗,等.检测汞离子的比色-荧光双通道探针的设计合成及应用[J].分析化学,2023(2):204-214.
[14] 王娇炳.基于多酰胺受体的汞离子分子荧光探针[D].大连:大连理工大学,2007.
[15] 梁国熙,潘常刚,卢庆,等.荧光碳量子点的制备及其在Cu2+检测中的应用[J].江苏大学学报(自然科学版),2020,41(4):440-445.
[16] 李玲玲,倪刚,王嘉楠,等.氮掺杂碳量子点的合成及作为荧光探针对Hg2+的检测[J].光谱学与光谱分析,2016,36(9):2846-2851.
基金资助
大连市科技创新基金项目(2020JJ26GX042)
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