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<p>This study reports a novel, eco-friendly green synthesis of nickel oxide nanoparticles (NiO NPs) utilizing the red algae <i>Corallina elongata</i> as a biotemplating and reducing agent, followed by calcination. The synthesized NiO NPs were extensively characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray fluorescence (XRF), thermogravimetric/differential thermal analysis (TGA/DTA), UV–Visible spectroscopy, photoluminescence (PL) spectroscopy, and electrochemical impedance spectroscopy (EIS). XRD analysis confirmed the formation of cubic phase NiO with an average crystallite size of approximately 12.32&#xa0;nm. UV–Vis spectroscopy revealed an optical band gap of 2.41&#xa0;eV, indicating potential for UV/visible light photocatalysis, which was further supported by PL studies identifying defect-mediated emission pathways. The photocatalytic activity of the NiO NPs was evaluated for the degradation of methylene blue (MB) dye under solar irradiation. The effects of catalyst loading, initial dye concentration, and solution pH on the degradation efficiency were systematically investigated. The synthesized NiO NPs exhibited promising photocatalytic activity, achieving a maximum MB degradation efficiency of 93% under optimized conditions (10&#xa0;mg/L MB concentration, pH 12). Kinetic studies demonstrated that MB degradation followed pseudo-first-order kinetics with a rate constant of 0.01835&#xa0;min<sup>–1</sup>. Furthermore, the NiO NPs exhibited good reusability over three consecutive cycles. This work highlights a sustainable and cost-effective route for synthesizing highly efficient NiO photocatalysts, demonstrating their significant potential for the remediation of dye-polluted wastewater.</p>

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Sustainable NiO nanoparticles photocatalysts for efficient methylene blue removal: synthesis, characterization, and kinetic studies

  • 期刊论文

  • 发表日期：

    2025年6月15日

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  • Nassim Sayoud,
  • Abdennour Bouchair,
  • Oumnia Khen,
  • Sara Laib,
  • Hichem Boudellioua,
  • Fatah Hadji,
  • Abdelhalim Zoukel,
  • Houcine Touati

摘要

This study reports a novel, eco-friendly green synthesis of nickel oxide nanoparticles (NiO NPs) utilizing the red algae Corallina elongata as a biotemplating and reducing agent, followed by calcination. The synthesized NiO NPs were extensively characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray fluorescence (XRF), thermogravimetric/differential thermal analysis (TGA/DTA), UV–Visible spectroscopy, photoluminescence (PL) spectroscopy, and electrochemical impedance spectroscopy (EIS). XRD analysis confirmed the formation of cubic phase NiO with an average crystallite size of approximately 12.32 nm. UV–Vis spectroscopy revealed an optical band gap of 2.41 eV, indicating potential for UV/visible light photocatalysis, which was further supported by PL studies identifying defect-mediated emission pathways. The photocatalytic activity of the NiO NPs was evaluated for the degradation of methylene blue (MB) dye under solar irradiation. The effects of catalyst loading, initial dye concentration, and solution pH on the degradation efficiency were systematically investigated. The synthesized NiO NPs exhibited promising photocatalytic activity, achieving a maximum MB degradation efficiency of 93% under optimized conditions (10 mg/L MB concentration, pH 12). Kinetic studies demonstrated that MB degradation followed pseudo-first-order kinetics with a rate constant of 0.01835 min–1. Furthermore, the NiO NPs exhibited good reusability over three consecutive cycles. This work highlights a sustainable and cost-effective route for synthesizing highly efficient NiO photocatalysts, demonstrating their significant potential for the remediation of dye-polluted wastewater.