高等学校化学学报 ›› 2024, Vol. 45 ›› Issue (5): 20230504.doi: 10.7503/cjcu20230504

• 分析化学 • 上一篇    下一篇

基于N掺杂Ti3C2 MXene量子点的荧光探针用于Hg2+和S2-的传感检测

张慧莲1, 杨新杰1, 李军1, 李泉1, 张福娟1, 张艳丽1(), 王红斌1, 杨文荣1,2, 庞鹏飞1()   

  1. 1.云南民族大学, 云南省教育厅功能纳米材料基化学生物传感科技创新团队, 昆明 650504
    2.迪肯大学生命与环境科学学院, 吉朗 3217, 澳大利亚
  • 收稿日期:2023-12-11 出版日期:2024-05-10 发布日期:2024-03-05
  • 通讯作者: 张艳丽,庞鹏飞 E-mail:ylzhang@ymu.edu.cn;pfpang@aliyun.com
  • 基金资助:
    国家自然科学基金(21565031);云南省科技厅应用基础研究基金项目(202001AT070012);云南民族大学研究生科研创新基金项目(2023SKY028)

Fluorescent Probe for Detection of Hg2+ and S2- Based on N-Doped Ti3C2 MXene Quantum Dots

ZHANG Huilian1, YANG Xinjie1, LI Jun1, LI Quan1, ZHANG Fujuan1, ZHANG Yanli1(), WANG Hongbin1, YANG Wenrong1,2, PANG Pengfei1()   

  1. 1.Functional Nanomaterial?based Chemical and Biological Sensing Technology Innovation Team of Department of Education of Yunnan Province,Yunnan Minzu University,Kunming 650504,China
    2.School of Life and Environmental Sciences,Deakin University,Geelong 3217,Australia
  • Received:2023-12-11 Online:2024-05-10 Published:2024-03-05
  • Contact: ZHANG Yanli, PANG Pengfei E-mail:ylzhang@ymu.edu.cn;pfpang@aliyun.com
  • Supported by:
    the National Natural Science Foundation of China(21665027);the Applied Basic Research Project of Yunnan Provincial Science and Technology Department, China(202001AT070012);the Graduate Scientific Research Foundation of Yunnan Minzu University, China(2023SKY028)

摘要:

基于N掺杂Ti3C2 MXene量子点(N-Ti3C2 MQDs)荧光探针和配位相互作用, 构建了一种检测Hg2+和S2-的“开-关-开”型荧光传感新方法. 研究发现, 制备的N-Ti3C2 MQDs发射蓝色荧光(λem=440 nm), 荧光量子产率为15.7%. Hg2+与N-Ti3C2 MQDs表面的—NH2, —COOH, —OH等官能团产生选择性配位作用, 导致N-Ti3C2 MQDs体系荧光猝灭. 当加入S2-后, 由于S2-与Hg2+之间强的结合力, 形成HgS沉淀, 从而使N-Ti3C2 MQDs体系荧光恢复. 基于该原理, 构建了一种“开-关-开”型荧光传感方法, 实现了对Hg2+和S2-的定量检测. N-Ti3C2 MQDs探针的荧光强度与Hg2+浓度在0.02~200 μmol/L范围内呈良好线性关系, 检出限为10 nmol/L(S/N=3); 与S2-浓度在0.07~150 μmol/L范围内呈良好线性关系, 检出限为30 nmol/L(S/N=3). 该方法具有成本低、 操作简单、 灵敏度高和选择性好等特点, 并可用于水样中Hg2+和S2-的检测.

关键词: 汞离子, 硫离子, N掺杂Ti3C2 MXene, 量子点, 荧光探针

Abstract:

A novel fluorescent "on-off-on" method for the detection of Hg2+ and S2- was developed based on N-doped Ti3C2 MXene quantum dots(N-Ti3C2 MQDs) and complexation. The prepared N-Ti3C2 MQDs emitted blue fluorescence(λem=440 nm) with a fluorescence quantum yield of 15.7%. Hg2+ can selectively coordinate with functional groups of —NH2, —COOH, and —OH on the surface of N-Ti3C2 MQDs through electrostatic interaction, resulting in fluorescent quenching of the N-Ti3C2 MQDs system. After the addition of S2-, HgS precipitation is formed due to the strong binding force between S2- and Hg2+, leading to the fluorescent recovery of the N-Ti3C2 MQDs. Based on this principle, a fluorescent "on-off-on" sensing method was constructed to quantitatively detect Hg2+ and S2-. The fluorescenty of the N-Ti3C2 MQDs probe is proportional to Hg2+ and S2- concentrations in the range of 0.02—200 μmol/L and 0.07—150 μmol/L, with a detection limit of 10 nmol/L and 30 nmol/L(S/N=3), respectively. This proposed method has the advantages of low cost, simple operation, high sensitivity, and good selectivity, which has been used for the determination of Hg2+ and S2- in real water samples.

Key words: Hg2+, S2-, N-Doped Ti3C2 MXene, Quantum dot, Fluorescent probe

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