摘要
以梧桐叶为碳源,利用燃烧法合成了具有蓝色荧光的碳量子点(CQDs)溶液,碳量子点中含有羧基、羟基等亲水基团,其在水溶液中有很好的稳定性和分散性。碳量子点在Fe(Ⅲ)离子存在下聚集,导致荧光强度降低,进而利用铁离子对碳量子点的荧光猝灭效果,建立一种简单、快速检测铁离子含量的方法。比较了常见的16种金属离子(K^(+)、Ca^(2+)、Mg^(2+)、Al3+、Ba^(2+)、Zn^(2+)、Cr^(3+)、Mn^(2+)、Fe^(2+)、Co^(2+)、Ni^(2+)、Cu^(2+)、Pb^(2+)、Ag^(+))对CQDs的荧光猝灭作用,根据实验可以得出Fe^(3+)对CQDs的荧光猝灭作用最为明显;在最优条件实验下,Fe^(3+)浓度在2.5~100μmol/L范围内与CQDs的荧光猝灭呈良好的线性关系。该方法已应用于实际水样中Fe^(3+)的检测。
Using parasol leaves as carbon source, carbon dots with blue fluorescence were prepared by combustion method. The surface of the carbon dots isrich in hydroxyl and carboxyl hydrophilic group, so the carbon dots are very stable and dispersity in water.The aggregation of carbon quantum dots in the presence of Fe(Ⅲ) leads to the fluorescence quenching. Based on the fluorescence quenching effect of iron ions on carbon quantum dots, a simple and rapid method for the determination of iron ions was established. The results show that compared with 16 common metal ions, Fe^(3+)can quench the fluorescence of carbon quantum dots significantly. The ratio of fluorescence intensities(F/F0) hasa linear relationship with the concentration of Fe^(3+)ion in the range of 2.5~100 μmol/L(R^(2)= 0.996 2).The developed method has been successfully applied to the detection of Fe^(3+)in tap water.
作者
谷苗苗
李姣
周爱东
GU Miaomiao;LI Jiao;ZHOU Aidong(School of Chemistry and Life Sciences,Nanjing University Jinling College,Nanjing 210089,China;School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210023,China)
出处
《实验室研究与探索》
CAS
北大核心
2022年第11期53-56,共4页
Research and Exploration In Laboratory
基金
江苏省高等教育教改研究立项课题(2019JSJG316)
南京大学金陵学院校级教改项目(0010522021)。
关键词
碳量子点
荧光猝灭
Fe(Ⅲ)
carbon quantum dots
fluorescence quenching
iron ions Fe(Ⅲ)
