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<p>Multifunctional oxides are essential for energy storage and environmental remediation due to their ability to integrate several properties that improve the efficiency of energy storage and treatment of organic waste. In this research, the coprecipitation method was utilized to synthesize NiO, Ni<sub>0.98</sub>Y<sub>0.01</sub>La<sub>0.01</sub>O and Ni<sub>0.96</sub>Y<sub>0.02</sub>La<sub>0.02</sub>O nanopowders. The X-ray diffraction (XRD) analysis confirmed that all compositions exhibit a face-centered cubic structure of NiO. The X-ray photoelectron spectroscopy (XPS) analysis conducted on Ni<sub>0.96</sub>Y<sub>0.02</sub>La<sub>0.02</sub>O powder has demonstrated the existence of Ni<sup>2+</sup>, Y<sup>3+</sup> and La<sup>3+</sup> cations. The optical band gap energies for NiO, Ni<sub>0.98</sub>Y<sub>0.01</sub>La<sub>0.01</sub>O and Ni<sub>0.96</sub>Y<sub>0.02</sub>La<sub>0.02</sub>O nanopowders were found to be 3.36 eV, 3.09 eV, and 2.9 eV, respectively, suggesting significant potential for the degradation of organic pollutants when exposed to natural sunlight. Scanning electron microscopy (SEM) image of pure NiO powder displays nanoparticles form whereas the SEM image of Ni<sub>0.96</sub>Y<sub>0.02</sub>La<sub>0.02</sub>O nanopowder shows a sheet-like particles. The EDX mapping of Ni<sub>0.96</sub>Y<sub>0.02</sub>La<sub>0.02</sub>O powder demonstrates a consistent distribution of the dopants throughout the NiO matrix. Ni<sub>0.96</sub>Y<sub>0.02</sub>La<sub>0.02</sub>O sample exhibited a giant dielectric constant observed at low frequencies, making it a promising candidate composition for energy storage devices, capacitors, and advanced electronic components. The Ni<sub>0.96</sub>Y<sub>0.02</sub>La<sub>0.02</sub>O photocatalyst exhibits a superior photocatalytic performance for degrading malachite green and rose Bengal pollutants under direct sunlight, achieving photodegradation efficiencies above 97% after 36 min.</p>

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Colossal Permittivity and Superior-degradation of Hazardous Malachite Green and Rose Bengal Dyes: (Y, La) Modified NiO Nanostructures

  • 期刊论文

  • 发表日期：

    2026年7月14日

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  • Moufida Boukriba,
  • Suzan Makawi,
  • Ali Moulahi

摘要

Multifunctional oxides are essential for energy storage and environmental remediation due to their ability to integrate several properties that improve the efficiency of energy storage and treatment of organic waste. In this research, the coprecipitation method was utilized to synthesize NiO, Ni0.98Y0.01La0.01O and Ni0.96Y0.02La0.02O nanopowders. The X-ray diffraction (XRD) analysis confirmed that all compositions exhibit a face-centered cubic structure of NiO. The X-ray photoelectron spectroscopy (XPS) analysis conducted on Ni0.96Y0.02La0.02O powder has demonstrated the existence of Ni2+, Y3+ and La3+ cations. The optical band gap energies for NiO, Ni0.98Y0.01La0.01O and Ni0.96Y0.02La0.02O nanopowders were found to be 3.36 eV, 3.09 eV, and 2.9 eV, respectively, suggesting significant potential for the degradation of organic pollutants when exposed to natural sunlight. Scanning electron microscopy (SEM) image of pure NiO powder displays nanoparticles form whereas the SEM image of Ni0.96Y0.02La0.02O nanopowder shows a sheet-like particles. The EDX mapping of Ni0.96Y0.02La0.02O powder demonstrates a consistent distribution of the dopants throughout the NiO matrix. Ni0.96Y0.02La0.02O sample exhibited a giant dielectric constant observed at low frequencies, making it a promising candidate composition for energy storage devices, capacitors, and advanced electronic components. The Ni0.96Y0.02La0.02O photocatalyst exhibits a superior photocatalytic performance for degrading malachite green and rose Bengal pollutants under direct sunlight, achieving photodegradation efficiencies above 97% after 36 min.