碳量子点荧光探针制备及对铬(Ⅵ)的检测应用  

Synthesis of carbon quantum dots and application in Cr(Ⅵ)detection

作　　者：应露 沈路萍 陆筑凤[1] 王红梅[1] Ying Lu;Shen Luping;Lu Zhufeng;Wang Hongmei(College of Biological,Chemical Sciences and Engineering,Jiaxing University,Jiaxing 314001,China)

机构地区：[1]嘉兴学院生物与化学工程学院,嘉兴314001

出　　处：《分析仪器》2019年第1期137-140,共4页Analytical Instrumentation

基　　金：浙江省公益技术应用研究(分析测试)项目(2018C37077);浙江省大学生科技创新活动计划(新苗人才计划)项目(2018R417003);浙江省第十六届"挑战杯"大学生课外学术科技作品竞赛支持

摘　　要：以生物质基碳源一步水热法合成碳量子点(CQDs)。通过电镜、荧光光谱、红外光谱等表征,制备良好荧光性能的CQDs;探讨Cr(Ⅵ)对CQDs的荧光猝灭效应,建立荧光检测Cr(Ⅵ)离子浓度的方法。结果表明CQDs的平均尺寸在3～5nm,荧光检测显示332nm处有最大紫外吸收特征峰,在440nm处有强荧光发射峰。在pH 6.0的体系中CQDs浓度18.72μg·mL-1(以碳计),室温25℃与Cr(Ⅵ)反应30min猝灭稳定。低浓度Cr(Ⅵ)离子与体系的荧光猝灭程度呈良好的线性关系,可开展深入研究。In this paper,the carbon quantum dots(CQDs)were firstly synthesized by one-step hydrothermal method using biochemical substances as the carbon source.The CQDs were characterized by electron microscopy,fluorescence spectrometry and Fourier transform infrared spectrometry.The properties characterization demonstrated that CQDs whose size was about 3.5nm had excellent fluorescence performance.In the buffer solution at pH=6.0,fluorescence quenching turned to be stable after 18.72μg·mL-1 CQDs(in carbon)reacted with Cr(VI)at 25℃for 30min.The system was determined at the excitation wavelength of 332 nm and the emission wavelength of 440 nm.The results showed that the concentration of Cr(VI)had a good linear relationship with the fluorescence quenching degree of the system,and more in-depth study needs to be developed.

关 键 词：碳量子点(CQDs) 荧光猝灭 铬(Ⅵ) 荧光检测 

分 类 号：O657.3[理学—分析化学]