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
Fluorescent Probe for Detection of Hg2+ and S2-Based on N-Doped Ti3C2 MXene Quantum Dots
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 2庞鹏飞1
作者信息
- 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. 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;迪肯大学生命与环境科学学院,吉朗 3217,澳大利亚
- 折叠
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.
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 fluores-centy 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.
关键词
汞离子/硫离子/N掺杂Ti3C2/MXene/量子点/荧光探针Key words
Hg2+/S2-/N-Doped Ti3C2 MXene/Quantum dot/Fluorescent probe引用本文复制引用
基金项目
国家自然科学基金(21565031)
国家自然科学基金(21665027)
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)
出版年
2024
国家科技期刊平台
NSTL
万方数据