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<p>In this study, porous nanocomposite material was prepared by hybridising reduced graphene oxide (rGO) with cobalt-manganese spinel oxide (CoMn<sub>2</sub>O<sub>4</sub>) using a simple hydrothermal technique. The prepared samples were characterised using X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), Brunauer–Emmett–Teller (BET) and X-ray Photoelectron Spectroscopy (XPS) to analyse its crystal structure, functional groups, morphology, surface area, and oxidation state. The structural study indicated that CoMn₂O₄ nanoparticles were uniformly anchored on the rGO sheets, increasing the overall physicochemical features of the composite. The photocatalytic performance of CoMn₂O₄@rGO was evaluated under visible-light irradiation for the degradation of Methylene Blue (MB) and Rhodamine B (RhB). The composite demonstrated superior photocatalytic activity compared to pristine rGO, with degradation efficiencies of 95% for MB and 84% for RhB. Optimization studies were conducted by varying parameters such as pH, catalyst dosage, and H₂O₂ concentration, further confirming the material’s efficiency in pollutant removal. Scavenger studies revealed that the degradation process follows a Z-scheme photocatalytic mechanism, facilitating efficient photogenerated electron-hole separation under sunlight irradiation. These results suggested that the synthesised CoMn<sub>2</sub>O<sub>4</sub>@rGO would be highly helpful for the decomposition of organic pollutants in various industries.</p>

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Structural Elucidation and Environmental Remediation Potential of Novel CoMn2O4@rGO Nanocatalyst

  • 期刊论文

  • 发表日期：

    2025年3月26日

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  • P. Rajeswaran,
  • P. Kamalarajan,
  • S. Vasanthan,
  • S. Sivagami,
  • D. Venkatesh,
  • P. Siva Karthik

摘要

In this study, porous nanocomposite material was prepared by hybridising reduced graphene oxide (rGO) with cobalt-manganese spinel oxide (CoMn2O4) using a simple hydrothermal technique. The prepared samples were characterised using X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), Brunauer–Emmett–Teller (BET) and X-ray Photoelectron Spectroscopy (XPS) to analyse its crystal structure, functional groups, morphology, surface area, and oxidation state. The structural study indicated that CoMn₂O₄ nanoparticles were uniformly anchored on the rGO sheets, increasing the overall physicochemical features of the composite. The photocatalytic performance of CoMn₂O₄@rGO was evaluated under visible-light irradiation for the degradation of Methylene Blue (MB) and Rhodamine B (RhB). The composite demonstrated superior photocatalytic activity compared to pristine rGO, with degradation efficiencies of 95% for MB and 84% for RhB. Optimization studies were conducted by varying parameters such as pH, catalyst dosage, and H₂O₂ concentration, further confirming the material’s efficiency in pollutant removal. Scavenger studies revealed that the degradation process follows a Z-scheme photocatalytic mechanism, facilitating efficient photogenerated electron-hole separation under sunlight irradiation. These results suggested that the synthesised CoMn2O4@rGO would be highly helpful for the decomposition of organic pollutants in various industries.