Construction of fluorescence sensor based on nitrogen and phosphorus co-doped carbon dots and the efficient analysis of mercury ion

摘要：

以柠檬酸铵和磷酸胍为前驱体，利用简便的一步水热法制备了氮、磷共掺杂荧光碳点(N，P-CDs).采用傅里叶变换红外光谱、X射线光电子能谱、X射线衍射仪、透射电子显微镜、紫外-可见吸收光谱和荧光光谱对其结构、形貌和光学性质进行了表征.N，P-CDs碳点分散性好,平均粒径为2.5 nm,表面含有氨基、羟基、羧基等官能团.荧光稳定性好.基于静态猝灭机制，建立了灵敏检测黄河流域河南段环境中汞离子(Hg^2＋)的新方法.Hg^2＋浓度在0.05~12.50μmol/L范围内与其荧光猝灭率呈现良好的线性关系,方法的检出限为9.50nmol/L;该方法成功用于黄河流域河南段水样和土样中Hg²⁺的分析,样品的加标回收率为96.8%~104.8%.所构筑的荧光传感器为环境中Hg^2＋的高效分析提供了一个简便快速的新方法.

Nitrogen and phosphorus co-doped fluorescent carbon dots(N，P-CDs) were prepared by using ammonium cit-rate and guanidine phosphate as the precursors through a simple one-step hydrothermal method. The structure, morphology and optical properties of N，P-CDs were well characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy. X-ray diffractomer. transmission electron microscopy. Ultraviolet-visible(UV-vis) absorption spectroscopy. and fluorescence spectroscopy. The mean particle diameter of N， P-CDs was 2.5 nm with good dispersion. There were amino. hydroxyl, carboxyl groups on the N，P-CDs surface and the N，P-CDs possessed excellent fluorescence stability. A novel approach was constructed for sensitive detection of mercury ion in environment based on the static quenching mechanism. There was a good linear relationship between the quenching effect of the N，P-CDs and the concentration of Hg^2＋ in the range of 0.05-12.50μmol/L, and the detection limit was 9.50 nmol/L. The method had been successfully employed to measure Hg^2＋in envi-ronmental water and soil samples from the Henan section of the Yellow River Basin, and the recoveries ranged from 96.8 % to104.8%. The constructed fluorescent sensor offered a simple and rapid method for efficiently sensing Hg^2＋ in environmental samples.

作者：

高燕哺，黄亚，刘永丽，金甜苗，刘桓嘉，朱桂芬，罗晨诗，王雨欣

Gao Yanbu, Huang Ya, Liu Yongli, Jin Tianmiao, Liu Huanjia, Zhu Guifen, Luo Chenshi, Wang Yuxin

机构地区：

河南省地质研究院自然资源部黄河流域中下游水土资源保护与修复重点实验室；河南师范大学环境学院

引用本文：

高燕哺，黄亚，刘永丽等.基于氮、磷共掺杂碳点的荧光传感器构筑及对汞离子的高效分析[J].河南师范大学学报(自然科学版).2026.54(5):31-38.(Gao Yanbu. Huang Ya.Liu Yongli.et al.Construction of fluorescence sensor based on nitrogen and phosphorus co-doped carbon dots and the efficient analysis of mercury ion[J].Journal of Henan Normal University(Natural Science Edition),2026,54(5):31-38.DO1:10.16366/j.cnki.1000-2367.2025.09.25.0001.)

基金：

国家自然科学基金；河南省高等学校青年骨干教师培养计划

关键词：

氮、磷共掺杂碳点;荧光传感器;汞离子;静态猝灭

nitrogen and phosphorus co-doped carbon dots; fluorescent sensor; Hg^2t; static quenching

分类号：

O657

基于氮、磷共掺杂碳点的荧光传感器构筑及对汞离子的高效分析.pdf