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<p>In this work, we developed a facile green and cost-effective approach for the preparation of bio-δ-MnO₂ (manganese dioxide) nanoparticles by utilizing the carom seed extract as natural reducers and template agents. This route allows phase-pure δ-MnO₂ to be synthesized with a 16.4&#xa0;nm crystallite size and a high load of O-containing surface functionalities, which promote its electrochemical and catalytic performance. The formation of aggregated spherical nanoparticles is further confirmed by SEM–EDX. The Activated charcoal (AC) modified composite was prepared for better performance. AC/MnO₂ composite also performs very well as a supercapacitor with 750 F g⁻<sup>1</sup> and energy density of 19.9 Wh kg⁻<sup>1</sup> at 1 A g⁻<sup>1</sup>, a high cyclical stability showing almost retention capacity (about 100%). The nanoparticle is also highly catalytic, with a greater than 90% degradation of Rhodamine B in less than 100&#xa0;min. These findings highlight a sustainable and economical route for producing high-performance MnO₂ nanomaterials with strong potential for energy storage, environmental remediation, and related technological applications to meet current global needs, such as greener technologies. The work provides a novel biomass-derived strategy that broadens the scope of green MnO₂ synthesis and aligns with emerging perspectives in sustainable nanomaterials. These findings highlight the potential of carom-seed-mediated MnO₂ as a multifunctional material for energy storage and environmental remediation.</p>

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Facile and Sustainable Approach to Synthesize Bio-δ-MnO2 Nano Sphere from Carom Seeds: Supercapacitor, Dye Degradation and Antioxidant

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Suresh Munusamy,
  • Thangavel Thamaraikannan,
  • Subashini Kasivisvanathan,
  • Shinyjoy Elangomannan,
  • Rathinavelu Arumugam,
  • Priya Vettuvapalayam Thangarasu,
  • Karthikeyan Palanisamy

摘要

In this work, we developed a facile green and cost-effective approach for the preparation of bio-δ-MnO₂ (manganese dioxide) nanoparticles by utilizing the carom seed extract as natural reducers and template agents. This route allows phase-pure δ-MnO₂ to be synthesized with a 16.4 nm crystallite size and a high load of O-containing surface functionalities, which promote its electrochemical and catalytic performance. The formation of aggregated spherical nanoparticles is further confirmed by SEM–EDX. The Activated charcoal (AC) modified composite was prepared for better performance. AC/MnO₂ composite also performs very well as a supercapacitor with 750 F g⁻1 and energy density of 19.9 Wh kg⁻1 at 1 A g⁻1, a high cyclical stability showing almost retention capacity (about 100%). The nanoparticle is also highly catalytic, with a greater than 90% degradation of Rhodamine B in less than 100 min. These findings highlight a sustainable and economical route for producing high-performance MnO₂ nanomaterials with strong potential for energy storage, environmental remediation, and related technological applications to meet current global needs, such as greener technologies. The work provides a novel biomass-derived strategy that broadens the scope of green MnO₂ synthesis and aligns with emerging perspectives in sustainable nanomaterials. These findings highlight the potential of carom-seed-mediated MnO₂ as a multifunctional material for energy storage and environmental remediation.