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<p>Addressing complex wastewater contamination necessitates the development of nanomaterials that integrate both photocatalytic activity and sensing functionality within one system. In this article, we report a novel CuO/Cr₂O₃ nanocomposite for both electrochemical sensing of paracetamol at very low concentrations and sunlight-driven photodegradation of methyl orange (MO) by PMS activation method. The nanocomposite was synthesized by hydrothermal approach and characterized by a range of analytical techniques. The material exhibited good crystallinity, a narrow band gap of 1.3&#xa0;eV, and a high BET surface area of 180 m<sup>2</sup>/g, facilitating enhanced light absorption and greater active surface exposure. The photocatalytic efficiency was 95% degradation of methyl orange (20&#xa0;ppm) using 0.5&#xa0;g catalyst at pH 6, supported by a high kinetic rate constant of 4.89 × 10⁻<sup>2</sup>&#xa0;min⁻<sup>1</sup>. The improved activity is mainly attributed to the heterojunction at the CuO/Cr₂O₃ interface, which enhances charge separation and suppresses recombination, while the presence of peroxymonosulfate further promotes reactive species formation, leading to accelerated degradation. Electrochemical studies were carried out using a modified carbon paste-based electrode via cyclic voltammetry. Key parameters such as scan rate, pH, and analyte concentration were systematically optimized. A linear sensing response was obtained for paracetamol in the 2–20&#xa0;μM range, with corresponding LOD and LOQ values of 20.8&#xa0;μM and 69.2&#xa0;μM, confirming the material’s applicability for low-concentration pharmaceutical detection. In conclusion, the synthesized CuO/Cr₂O₃ nanocomposite demonstrated promising characteristics, efficient photocatalytic activity, and potential applications in electrochemical sensing and environmental applications.</p>

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Dual-functional CuO/Cr₂O₃ nanocomposite-modified electrode for paracetamol sensing and peroxymonosulfate-activated photocatalysis

  • 期刊论文

  • 发表日期：

    2026年4月17日

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  • Jahnavi Hunasekatte Katamallappa,
  • Jagadish Krishnegowda,
  • Dhanyashree Savitha Vishwakumar,
  • Rajendra Prasad Shivalingappa

摘要

Addressing complex wastewater contamination necessitates the development of nanomaterials that integrate both photocatalytic activity and sensing functionality within one system. In this article, we report a novel CuO/Cr₂O₃ nanocomposite for both electrochemical sensing of paracetamol at very low concentrations and sunlight-driven photodegradation of methyl orange (MO) by PMS activation method. The nanocomposite was synthesized by hydrothermal approach and characterized by a range of analytical techniques. The material exhibited good crystallinity, a narrow band gap of 1.3 eV, and a high BET surface area of 180 m2/g, facilitating enhanced light absorption and greater active surface exposure. The photocatalytic efficiency was 95% degradation of methyl orange (20 ppm) using 0.5 g catalyst at pH 6, supported by a high kinetic rate constant of 4.89 × 10⁻2 min⁻1. The improved activity is mainly attributed to the heterojunction at the CuO/Cr₂O₃ interface, which enhances charge separation and suppresses recombination, while the presence of peroxymonosulfate further promotes reactive species formation, leading to accelerated degradation. Electrochemical studies were carried out using a modified carbon paste-based electrode via cyclic voltammetry. Key parameters such as scan rate, pH, and analyte concentration were systematically optimized. A linear sensing response was obtained for paracetamol in the 2–20 μM range, with corresponding LOD and LOQ values of 20.8 μM and 69.2 μM, confirming the material’s applicability for low-concentration pharmaceutical detection. In conclusion, the synthesized CuO/Cr₂O₃ nanocomposite demonstrated promising characteristics, efficient photocatalytic activity, and potential applications in electrochemical sensing and environmental applications.