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<p>The present study focuses on the green synthesis, characterization and photocatalytic evaluation of Cu-doped NiO/rGO heterostructures under UV irradiation. To synthesise the heterostructure hybrid photocatalysts, an aqueous extract from <i>Acacia nilotica</i> leaves was used as a natural reducing and stabilising agent. This environmentally friendly process provides for a low-temperature, sustainable route for nanoparticle synthesis with avoiding hazardous compounds. The addition of Cu and rGO to the cubic-structured NiO lattice was validated by X-ray diffraction method. Field Emission Scanning Electron Microscopy (FESEM) images revealed uniformly distributed nanoparticles with an average size of approximately 20&#xa0;nm. The photocatalytic activity of the composites was evaluated for the degradation of Cr (VI) and Naphthol Blue Black (NBB) under UV light irradiation. The Cu-doped NiO/rGO nanocomposites shown significantly better photocatalytic efficiency relative to pure NiO, achieving up to 99% destruction of Cr (VI). The increased activity is due to the combined effects of Cu doping and the superior electron-transport characteristics of rGO, which together reduce charge recombination and boost photocatalytic efficiency. Furthermore, the composite exhibited enhanced stability and an increased rate constant. In contrast to traditional chemical synthesis methods, the Acacia nilotica-assisted green synthesis provides a cleaner, safer, and more sustainable alternative. The results indicate that Cu-doped NiO/rGO nanocomposites has significant promise for practical applications in wastewater treatment and environmental remediation.</p>

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Green Synthesis of Cu Wrapped NiO@rGO Nanocomposite Using Acacia nilotica Plant Extract: A Sustainable Solution for Photocatalytic and Antioxidant Activities

  • 期刊论文

  • 发表日期：

    2025年7月30日

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  • V. Kanchana,
  • A. Kistan,
  • S. Ramesh,
  • P. Balaramesh

摘要

The present study focuses on the green synthesis, characterization and photocatalytic evaluation of Cu-doped NiO/rGO heterostructures under UV irradiation. To synthesise the heterostructure hybrid photocatalysts, an aqueous extract from Acacia nilotica leaves was used as a natural reducing and stabilising agent. This environmentally friendly process provides for a low-temperature, sustainable route for nanoparticle synthesis with avoiding hazardous compounds. The addition of Cu and rGO to the cubic-structured NiO lattice was validated by X-ray diffraction method. Field Emission Scanning Electron Microscopy (FESEM) images revealed uniformly distributed nanoparticles with an average size of approximately 20 nm. The photocatalytic activity of the composites was evaluated for the degradation of Cr (VI) and Naphthol Blue Black (NBB) under UV light irradiation. The Cu-doped NiO/rGO nanocomposites shown significantly better photocatalytic efficiency relative to pure NiO, achieving up to 99% destruction of Cr (VI). The increased activity is due to the combined effects of Cu doping and the superior electron-transport characteristics of rGO, which together reduce charge recombination and boost photocatalytic efficiency. Furthermore, the composite exhibited enhanced stability and an increased rate constant. In contrast to traditional chemical synthesis methods, the Acacia nilotica-assisted green synthesis provides a cleaner, safer, and more sustainable alternative. The results indicate that Cu-doped NiO/rGO nanocomposites has significant promise for practical applications in wastewater treatment and environmental remediation.