Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Enhanced Electrochemical Detection of Heavy Metal Ions via Post-synthetic Schiff Base Modification of MWCNT-MOF Composites

  • Yeon-Joo Kim (Division of Materials Science and Engineering, Hanyang University) ;
  • Seung-Ho Choi (Division of Materials Science and Engineering, Hanyang University) ;
  • Seon-Jin Choi (Division of Materials Science and Engineering, Hanyang University)
  • Received : 2024.09.02
  • Accepted : 2024.09.20
  • Published : 2024.09.30
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Abstract

In this study, we present a novel approach to improve electrochemical heavy metal ion (HMI) sensing responses via post-synthetic modification of carbon nanotube-based metal-organic framework (MOF) nanocomposites with a Schiff base. UiO66-NH2 was employed as the MOF and incorporated with multi-walled carbon nanotubes (MWCNT) through in-situ growth, enhancing the electrical conductivity of the MWCNT-UiO66-NH2 composite. Subsequently, the Schiff base, which has been proven to be an excellent ligand for metal ion detection, was functionalized onto MWCNT-UiO66-NH2 via post-synthetic modification to improve its HMI absorption capacity. To evaluate the effect of the Schiff base on HMI detection capacity, electrochemical sensing of Cd2+, Pb2+, Cu2+, and Hg2+ was performed in an aqueous solution utilizing the MWCNT-UiO66-Schiff modified electrode as well as the bare electrode. Individual differential pulse anodic stripping voltammetry results revealed that the modified electrode with MWCNT-UiO66-Schiff exhibited increased HMI sensing properties, especially with 1.82-fold improvement in average oxidation currents toward 10 µM of Cu2+ compared to that for a bare glassy carbon electrode. The selective Cu2+-sensing properties of MWCNT-UiO66-Schiff were reflected in the highly selective Cu2-binding affinity of the Schiff base-containing model molecules compared to those of Cd2+, Hg2+, and Pb2+. Our work provides a new strategy for improving the sensing properties of electrochemical HMI sensors by the post-synthetic modification of MWCNT-UiO66 with a Schiff base.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIT) (No. RS-2023-00236572 and RS-2024-00407282). This work was also supported by the U.S. Army Combat Capabilities Development Command Soldier Center (DEVCOM SC) and the International Technology Center Pacific (ITC-PAC) Global Research Project under contract FA520922C0008 and conducted at Hanyang University. This research was supported by the Brain Korea 21 Fostering Outstanding Universities for Research (BK21 FOUR) project of the National Research Foundation of Korea Grant.

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