硫量子点的制备及构建荧光“关-开”型铅离子探针  

Preparation of sulfur quantum dots and construction of a fluorescent"off-on"lead ion probe

作　　者：湛志华 薛茗月 杨细妹 ZHAN Zhihua;XUE Mingyue;YANG Ximei(School of Chemistry and Chemical Engineering,Lingnan Normal University,Zhanjiang 524048,China;School of Life and Environmental Sciences,Guilin University of Electronic Technology,Guilin 541004,China)

机构地区：[1]岭南师范学院化学化工学院,湛江524048 [2]桂林电子科技大学生命与环境科学学院,桂林541004

出　　处：《分析试验室》2024年第9期1277-1282,共6页Chinese Journal of Analysis Laboratory

基　　金：国家自然科学基金(61861010);岭南师范学院人才专项(ZL1902,ZL1945);岭南师范学院示范教学团队:分析化学系列课程“课程思政”教学团队(2021)资助;2020年广东省高等教育教学改革项目(粤教高函[2020]20号,377)。

摘　　要：以升华硫粉、氢氧化钠、聚乙二醇(PEG-4000)、过氧化氢为原料,采用冷凝回流法制备了荧光硫量子点(SQDs),并通过X射线衍射(XRD)、红外光谱(FT-IR)等手段对材料进行了表征。该荧光SQDs最佳激发波长为370 nm,最佳发射波长为451 nm,具备较好的荧光稳定性。实验发现,3,5-二硝基水杨酸(DNS)可使SQDs荧光信号“关闭”,加入铅离子(Pb^(2+))后体系荧光信号重新“打开”,由此构建了“关-开”型探针检测Pb^(2+)的新方法。Pb^(2+)浓度在0~100μmol/L范围内与DNS-SQDs体系的荧光恢复值之间呈良好的线性关系,线性方程为ΔF=0.00167c_(Pb^(2+))+0.96306,线性相关系数(R2)为0.99842,检出限(LOD)为1.90μmol/L,回收率为108.6%~109.4%。该方法成功应用于模拟样品中Pb^(2+)的检测。By condensation reflux method,sulfur quantum dots(SQDs)with stable fluorescence properties were prepared using sublimated sulfur powder,sodium hydroxide,polyethylene glycol(PEG-4000)and hydrogen peroxide as raw materials.The SQDs were characterized by X-ray diffraction(XRD)and Fourier infrared spectrum(FT-IR).The fluorescence spectrum showed that the optimum excitation and emission wavelength of SQDs were 370 nm and 451 nm,respectively,showing good fluorescence stability.It was found that the fluorescence signal of SQDs can be turned off by 3,5-dinitrosalicylic acid(DNS)and recovered upon adding Pb^(2+).Based on this,a new"off-on"fluorescence probe method for the detection of Pb^(2+)was developed.The recovered fluorescence intensity of DNS-SQDs system was linearly related with Pb^(2+)concentration in the range of 0-100μmol/L,the linear equation wasΔF=0.00167c_(Pb^(2+))+0.96306,the correlation coefficient(R~2)was 0.99842,the detection limit was 1.90μmol/L,and the recovery rates were 108.6%-109.4%.The method has been successfully applied to the determination of Pb^(2+)in simulated samples.

关 键 词：硫量子点 光稳定性 铅离子 分析检测 

分 类 号：O657.3[理学—分析化学]