Determine methylene blue based on carbon paste electrode modified with nanoparticles of nickel oxide-nitrogen carbon quantum dots and carbon structures by cyclic voltammetry

Volume 7, Issue 01, Pages 17-29, March 2024 *** Field: Analytical Chemistry

  • Khalil Ibrahim Alabid, Corresponding Author, Ph.D. candidate of Analytical Chemistry Department, Faculty of Science, Tishreen University, Syria
  • Hajar Naser Nasser bAnalytical Chemistry Department, Faculty of Science, Tishreen University, Syria
Keywords: Methylene Blue, Electrochemical method, UV-Vis spectrometry, Adsorbent behavior, Methylthionine chloride


This paper deals with an electrochemical method for the determination of methylene blue (MB) by fabrication of an electrode based on a carbon paste modified with nano-nickel oxide and nitrogen carbon quantum dots (NiO-NCQD), graphene-carbon nitride (g-C3N4), reduced graphene oxide (rGO), and graphite powder and paraffin oil are as a plasticizer. This electrode is used as a working electrode.  The analytical method used is cyclic voltammetry (CV), The oxidation-reduction curve of methylene blue was shown using this electrode. It is a quasi-reversible curve, and it works at (pH =1) and the best acid used is HCl a concentration of (0.1M). It was also found that the linear range is within the range of (7.99-31.98 mg L-1). The standard deviation (SD) and relative standard deviation (RSD%) were obtained at (0.361 mg L-1 and 0.294 mg L-1) and (4.52% and 3.68%) for both oxidation and reduction respectively. Retrospective, the limit of quantitative (LOQ) and limit of detection (LOD) were achieved at (99.65%; 99.70%), (0.24 mg L-1; 0.13 mg L-1), and (0.071 mg L-1; 0.039 mg L-1) for both oxidation and reduction respectively. Methylene blue was analyzed by UV-Vis spectrophotometry at (663 nm).


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How to Cite
Alabid, K., & Nasser, H. (2024). Determine methylene blue based on carbon paste electrode modified with nanoparticles of nickel oxide-nitrogen carbon quantum dots and carbon structures by cyclic voltammetry. Analytical Methods in Environmental Chemistry Journal, 7(01), 17-29.
Original Article