Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (5): 20230504.doi: 10.7503/cjcu20230504

• Analytical Chemistry • Previous Articles     Next Articles

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)

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

CLC Number: 

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