高等学校化学学报 ›› 2023, Vol. 44 ›› Issue (4): 20220719.doi: 10.7503/cjcu20220719

• 分析化学 • 上一篇    下一篇

基于二硫化钼和钴基金属有机骨架的痕量汞离子电化学传感器

王日1,2, 边超1, 谢勇1,2, 韩明杰1,2, 李洋1, 夏善红1()   

  1. 1.中国科学院空天信息创新研究院, 传感技术联合国家重点实验室, 北京 100190
    2.中国科学院大学电子电气与通信工程学院, 北京 100049
  • 收稿日期:2022-11-14 出版日期:2023-04-10 发布日期:2022-12-16
  • 通讯作者: 夏善红 E-mail:shxia@mail.ie.ac.cn
  • 基金资助:
    国家重点研发计划项目(2021YFB3201400)

Novel Electrochemical Sensor Based on Molybdenum Disulfide and Cobalt Based Metal Organic Frameworks Nanocomposites for Trace Mercury Detection

WANG Ri1,2, BIAN Chao1, XIE Yong1,2, HAN Mingjie1,2, LI Yang1, XIA Shanhong1()   

  1. 1.State Key Laboratory of Transducer Technology,Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100190,China
    2.School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2022-11-14 Online:2023-04-10 Published:2022-12-16
  • Contact: XIA Shanhong E-mail:shxia@mail.ie.ac.cn
  • Supported by:
    the National Key Research and Development Program of China(2021YFB3201400)

摘要:

汞离子(Hg2+)具有高生物毒性, 痕量的汞也会对生态环境质量和人体健康造成严重危害. 本文基于二硫化钼(MoS2)和钴基金属有机骨架(ZIF-67)的复合材料MoS2@ZIF-67制备了一种新型的电化学传感器, 结合MoS2的优异导电性与金属有机骨架的催化性能, 复合材料MoS2@ZIF-67可放大电化学信号, 提高电极的电化学活性. 利用Hg2+能与DNA中胸腺嘧啶T结合形成T-Hg2+-T双螺旋结构的原理, 使用差分脉冲伏安法实现了对水环境中痕量汞的特异性检测. 该传感器对Hg2+检测的线性范围为0.01~10 μg/L, 检出限为5 ng/L, 并表现出较好的选择性. 采用该传感器对自来水样品进行加标回收检测, 回收率为110%~119%, 在痕量汞的检测中具有良好的应用前景.

关键词: 汞离子检测, 二硫化钼, 钴基金属有机骨架, T-Hg2+-T

Abstract:

The detection of trace mercury ions(Hg2+) in water is imperative to ensure water quality and human health. In this work, a novel electrochemical sensor based on molybdenum disulfide(MoS2) and cobalt based metal organic frameworks nanocomposites(MoS2@ZIF-67) was developed to detect trace Hg2+ in water through differential pulse voltammetry. MoS2@ZIF-67 amplified the electrochemical signals and improved the electrochemical activity of the sensor, which combined the excellent conductivity of MoS2 and catalytic performance of metal organic frameworks. The specific detection of Hg2+ was realized by the double strand structure of T-Hg2+-T formed by Hg2+ and thymine T in DNA. The sensor achieved excellent performances in detection of Hg2+, including a low limit of detection(5 ng/L), considerable linear range(0.01—10 μg/L), good selectivity and satisfactory recovery in tap water samples, which had the potential for application in the future.

Key words: Mercury detection, Molybdenum disulfide, Cobalt based metal organic framework, T-Hg2+-T

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