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<p>Methyl orange (MO) is a common azo dye that harms human health and is used in the food, paper, and textile sectors. MO detection at low levels is crucial. This study used the hydrothermal method to synthesize a manganese dioxide-titanium dioxide nanocomposite (MnO<sub>2</sub>-TiO<sub>2</sub>). The synthesized nanocomposite was examined using physicochemical methods, including Energy Dispersive X-ray analysis (EDAX), X-ray Diffraction Spectroscopy (XRD), Field Emission Scanning Electron Microscopy (FESEM), X-ray Photoelectron Spectroscopy (XPS) and Fourier Transform Infrared Spectroscopy (FTIR). The cyclic voltammetry (CV) was used to sense the amount of MO dye. The MnO<sub>2</sub>-TiO<sub>2</sub> modified graphite electrode (GE) had a superior current response at a pH of 8. For this MnO<sub>2</sub>-TiO<sub>2</sub> modified GE, a linear range of 1–5 µM with a correlation coefficient (R<sup>2</sup>) of 0.97, a detection limit of 1 µM, a quantification limit of 3.5 µM, and a sensitivity of the sensor is 3 µA.µM<sup>− 1</sup>.cm<sup>− 2</sup> were obtained. The findings should be viewed as a beginning point for developing a portable device that aids in onsite monitoring.</p>

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Electrochemical performance of MnO2-TiO2 nanocomposite for methyl orange sensing applications

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Mythili Kumaresan Kavitha,
  • Radha Sankararajan,
  • Sreeja Balakrishnapillai Suseela,
  • Muthumeenakshi Kailasam,
  • Vijayalakshmi Kailasam

摘要

Methyl orange (MO) is a common azo dye that harms human health and is used in the food, paper, and textile sectors. MO detection at low levels is crucial. This study used the hydrothermal method to synthesize a manganese dioxide-titanium dioxide nanocomposite (MnO2-TiO2). The synthesized nanocomposite was examined using physicochemical methods, including Energy Dispersive X-ray analysis (EDAX), X-ray Diffraction Spectroscopy (XRD), Field Emission Scanning Electron Microscopy (FESEM), X-ray Photoelectron Spectroscopy (XPS) and Fourier Transform Infrared Spectroscopy (FTIR). The cyclic voltammetry (CV) was used to sense the amount of MO dye. The MnO2-TiO2 modified graphite electrode (GE) had a superior current response at a pH of 8. For this MnO2-TiO2 modified GE, a linear range of 1–5 µM with a correlation coefficient (R2) of 0.97, a detection limit of 1 µM, a quantification limit of 3.5 µM, and a sensitivity of the sensor is 3 µA.µM− 1.cm− 2 were obtained. The findings should be viewed as a beginning point for developing a portable device that aids in onsite monitoring.