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<p>MnO<sub>2</sub> is an efficient photocatalyst for the degradation of organic dyes under visible-light irradiation due to its favourable structural, electronic, and morphological characteristics, including a narrow band gap. In the present study, the crystalline α-MnO<sub>2</sub> nanorods have been prepared by a simple and cost-effective method via a KMnO<sub>4</sub>-ethylene glycol redox route followed by subsequent calcination. The powder X-ray diffraction (PXRD) pattern confirms a well-crystalline α-MnO<sub>2</sub> phase. The scanning electron microscopy (SEM) images reveal the rod-like morphology. The calculated direct band gap of α-MnO<sub>2</sub> nanostructures is 1.5&#xa0;eV, enabling strong absorption in the visible region and efficient utilisation of solar energy. A systematic investigation of the pH-dependent photocatalytic degradation of two structurally distinct cationic dyes, methylene blue (MB) and Rhodamine B (Rh-B), is carried out, with enhanced degradation efficiencies (&gt; 95%) achieved within a short irradiation time. The study establishes a direct correlation between crystal structure, nanorod morphology, and enhanced oxidative photodegradation performance. The results reveal that α-MnO<sub>2</sub> nanorods are efficient and practical photocatalysts for the remediation of organic pollutants.</p>

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Synergistic photocatalytic activity of α-MnO2 nanorods for the degradation of methylene blue and Rhodamine-B dyes

  • 期刊论文

  • 发表日期：

    2026年6月20日

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  • P. Sanjay,
  • M. S. Vasanthkumar,
  • S. Shivakumara,
  • M. Srinivas

摘要

MnO2 is an efficient photocatalyst for the degradation of organic dyes under visible-light irradiation due to its favourable structural, electronic, and morphological characteristics, including a narrow band gap. In the present study, the crystalline α-MnO2 nanorods have been prepared by a simple and cost-effective method via a KMnO4-ethylene glycol redox route followed by subsequent calcination. The powder X-ray diffraction (PXRD) pattern confirms a well-crystalline α-MnO2 phase. The scanning electron microscopy (SEM) images reveal the rod-like morphology. The calculated direct band gap of α-MnO2 nanostructures is 1.5 eV, enabling strong absorption in the visible region and efficient utilisation of solar energy. A systematic investigation of the pH-dependent photocatalytic degradation of two structurally distinct cationic dyes, methylene blue (MB) and Rhodamine B (Rh-B), is carried out, with enhanced degradation efficiencies (> 95%) achieved within a short irradiation time. The study establishes a direct correlation between crystal structure, nanorod morphology, and enhanced oxidative photodegradation performance. The results reveal that α-MnO2 nanorods are efficient and practical photocatalysts for the remediation of organic pollutants.