Nano-Cu Modified Cu and Nano-Cu Modified Graphite Electrodes for Chemical Oxygen Demand Sensors

Yuris Diksy, Isnaini Rahmawati, Prastika K. Jiwanti, Tribidasari A. Ivandini

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Nano-Cu modified Cu (nano-Cu/Cu) and nano-Cu modified graphite (nano-Cu/C) electrodes were prepared by depositing a thin layer of copper nanoparticles on a Cu wire or graphite electrode. Chronoamperometric and cyclic voltammetry techniques were applied to deposit the nanoparticles. The effects of Cu2+ concentration, deposition time, number of scan cycles, and scan rate were studied to determine the optimum conditions of the experiment. The applications of both electrodes in the COD analysis were performed using glucose and glycine as the models. The voltammetry of a mixture solution of glucose (mg/L) and glycine (mg/L) in 0.075 M NaOH solution showed an oxidation peak at +0.68 V vs. Ag/AgCl. Good stability of this peak current was shown with relative standard deviations lower than 3% for 10 measurements. Amperometric determination of COD at this potential showed excellent linearities at both nano-Cu/Cu and nano-Cu/C electrodes (R2 = 0.997) as well as good precision and accuracy with estimated detection limits of around ∼9 mgO/L for both the developed electrodes. Validation using the conventional COD measurements showed that the measurements achieved the average values of 92.58 and 87.86%, respectively, for nano-Cu/Cu and nano-Cu/C electrodes. Furthermore, comparison with the theoretical COD value achieved 94.90 and 89.87%, respectively, for nano-Cu/Cu and nano-Cu/C electrodes. The results indicated that both electrodes are suitable for practical application in COD determination.

Original languageEnglish
Pages (from-to)1323-1330
Number of pages8
JournalAnalytical sciences : the international journal of the Japan Society for Analytical Chemistry
Volume36
Issue number11
DOIs
Publication statusPublished - 10 Nov 2020

Keywords

  • chemical oxygen demand
  • copper wire
  • glycine and glucose
  • graphite
  • nano-Cu
  • Sensor

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