海南师范大学学报（自然科学版）2025，Vol.38Issue(2)：152-160,9.DOI:10.12051/j.issn.1674-4942.2025.02.005
荧光碳点的制备及其对汞离子的选择性检测
Preparation of Fluorescent Carbon Dots and Their Selective Detection of Mercury Ions
摘要
Abstract
In view of the potential threat of Hg2+to the environment and human health,it is particularly important to develop an efficient and accurate Hg2+quantitative analysis method.Fluorescence detection method is popular because of its simple operation and low cost.Therefore,this study aims to explore a low-cost,high sensitivity and good selectivity fluorescent car-bon dot detection method.Firstly,polyethylenimine(HPEI)was modified by glycidyl,then the modified polyethylenimine modified fluorescent carbon dots(mPEI-CDs)were successfully synthesized by one-step hydrothermal method with citric acid and modified polyethylenimine(mPEI)as the core precursors.The fluorescence quantum yield was as high as 25.6%.The experimental results showed that the fluorescence quenching efficiency(F0-F)/F0 of mPEI-CDs was positively correlat-ed with the concentration of Hg2+with a good linear relationship in the range of 1～100 µmol/L.The regression equation was y=0.319 35 lgC+1.941 34,the correlation coefficient R2=0.996,and the detection limit was 0.47 µmol/L.These flu-orescent carbon dots not only have excellent fluorescence performance,but also show good selectivity and high sensitivity in the detection of Hg2+.When they were applied to the detection of Hg2+in Haihe River,even if there were many ions in the Haihe River,such as Na+,K+,Ca2+,Cl-,CO32-,etc.,high selectivity and high sensitivity detection of Hg2+can still be achieved.This discovery lays a solid foundation for the application of fluorescence sensing method based on fluorescent carbon dots(mPEI-CDs)in the quantitative analysis of Hg2+and enriches the technical means of quantitative analysis of Hg2+and pro-vides strong support for environmental monitoring,water quality security and human health risk assessment.关键词
荧光碳点/汞离子/聚乙烯亚胺/定量检测Key words
fluorescent carbon dot/mercury ion/polyethyleneimine/quantitative detection分类
化学化工引用本文复制引用
翟慧云,黄鑫,段鹏丽,刘冷,王宇星,郭玉珍,杜意恩..荧光碳点的制备及其对汞离子的选择性检测[J].海南师范大学学报（自然科学版）,2025,38(2):152-160,9.基金项目
山西省应用基础研究面上基金项目(201901D111303) （201901D111303）
