Voltammetric Detection of Cu²⁺ Using a Napa Soil-Derived NiAl₂O₄/MWCNT-Modified Glassy Carbon Electrode

Authors

  • Ihya Zakira Sani Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang,Jl.Prof. Dr.Hamka Air Tawar Barat, Padang, Indonesia https://orcid.org/0009-0005-6986-3968
  • Mawardi Mawardi Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang,Jl.Prof. Dr.Hamka Air Tawar Barat, Padang, Indonesia
  • Desy Kurniawati Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang,Jl.Prof. Dr.Hamka Air Tawar Barat, Padang, Indonesia
  • Miftahul Khair Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang,Jl.Prof. Dr.Hamka Air Tawar Barat, Padang, Indonesia
  • Okta Suryani Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang,Jl.Prof. Dr.Hamka Air Tawar Barat, Padang, Indonesia

DOI:

https://doi.org/10.33394/hjkk.v14i3.21279

Keywords:

Cu²⁺ Detection, Cyclic Voltammetry, Nial₂O₄, MWCNT, Glassy Carbon Electrode

Abstract

Copper ions (Cu²⁺) are essential trace elements but may become toxic at elevated concentrations, requiring reliable monitoring methods. In this study, a NiAl₂O₄/MWCNT-modified glassy carbon electrode (GCE) derived from napa soil was developed for the voltammetric determination of Cu²⁺ ions. The modified electrode was prepared by combining NiAl₂O₄ synthesized from napa soil with multi-walled carbon nanotubes (MWCNTs) through a drop-casting technique. Electrochemical characterization demonstrated that the incorporation of NiAl₂O₄ and MWCNTs significantly enhanced the electrochemical performance of the electrode by improving electron-transfer efficiency and increasing the electroactive surface area. The modified electrode exhibited a strong voltammetric response toward Cu²⁺ ions, while HClO₄ was identified as the most suitable supporting electrolyte among the investigated media. Selectivity studies showed that Cu²⁺ remained detectable in the presence of Pb²⁺, although partial signal suppression was observed at higher Pb²⁺ concentrations. These findings indicate that the NiAl₂O₄/MWCNT-modified GCE is a promising low-cost and sustainable platform for Cu²⁺ determination in aqueous environments.

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Published

2026-06-30

How to Cite

Sani, I. Z., Mawardi, M., Kurniawati, D., Khair, M., & Suryani, O. (2026). Voltammetric Detection of Cu²⁺ Using a Napa Soil-Derived NiAl₂O₄/MWCNT-Modified Glassy Carbon Electrode. Hydrogen: Jurnal Kependidikan Kimia, 14(3), 488–496. https://doi.org/10.33394/hjkk.v14i3.21279

Issue

Vol. 14 No. 3 (2026): June 2026

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Copyright (c) 2026 Ihya Zakira Sani, Mawardi Mawardi, Desy Kurniawati, Miftahul Khair, Okta Suryani

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