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<p>The fact that metal oxide nanoparticles (NPs) have been used in both the energy and environmental fields has recently garnered huge attention. Hence, we investigate the photocatalytic properties of Ni<sub>1−<i>x</i></sub>Li<sub><i>x</i></sub>O with <i>x</i> = 0.0, 1.0, 2.5, 5.0, and 7.5&#xa0;wt% Li doping concentrations produced using a simple and inexpensive combustion method. XRD study reveals the synthesis of monophasic NiO at all Li-contents, and the crystallite size was found to be enhanced from 22 to 26&#xa0;nm. The vibrational analysis further confirms the single phase. The morphology and combustion studies were performed using SEM/EDX and TEM/HRTEM/SAED and approved the growth of well-crystalline nanomaterial. The band gap values were estimated through Kubelka–Munk methods and found that on increasing the Li doping content in NiO, the energy bandgap reduced from 3.55 to 3.36&#xa0;eV (Δ<i>E</i> = 0.19&#xa0;eV), and the mesoporous architecture of the synthesized samples played a decisive role in facilitating the efficient degradation of cationic dye under illumination. When subjected to natural sunlight, the Li-doped NiO NPs exhibited an instant methylene blue (MB) dye breakdown. The NiO NPs doped with 7.5% Li show 98% MB dye degradation in the presence of natural sunlight. Furthermore, the FTIR spectrum confirms the degradation of MB dye when subjected to light exposure. This improved photocatalytic performance indicates the potential of these Ni<sub>1−<i>x</i></sub>Li<sub><i>x</i></sub>O NPs for use in water treatment applications.</p>

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Remarkably enhanced photocatalytic performance of facile sol–gel combustion synthesized Ni1−xLixO nanoparticles

  • 期刊论文

  • 发表日期：

    2025年5月17日

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  • Ashwani Kumar,
  • R. Marnadu,
  • Talat Ali,
  • Mohd Shkir

摘要

The fact that metal oxide nanoparticles (NPs) have been used in both the energy and environmental fields has recently garnered huge attention. Hence, we investigate the photocatalytic properties of Ni1−xLixO with x = 0.0, 1.0, 2.5, 5.0, and 7.5 wt% Li doping concentrations produced using a simple and inexpensive combustion method. XRD study reveals the synthesis of monophasic NiO at all Li-contents, and the crystallite size was found to be enhanced from 22 to 26 nm. The vibrational analysis further confirms the single phase. The morphology and combustion studies were performed using SEM/EDX and TEM/HRTEM/SAED and approved the growth of well-crystalline nanomaterial. The band gap values were estimated through Kubelka–Munk methods and found that on increasing the Li doping content in NiO, the energy bandgap reduced from 3.55 to 3.36 eV (ΔE = 0.19 eV), and the mesoporous architecture of the synthesized samples played a decisive role in facilitating the efficient degradation of cationic dye under illumination. When subjected to natural sunlight, the Li-doped NiO NPs exhibited an instant methylene blue (MB) dye breakdown. The NiO NPs doped with 7.5% Li show 98% MB dye degradation in the presence of natural sunlight. Furthermore, the FTIR spectrum confirms the degradation of MB dye when subjected to light exposure. This improved photocatalytic performance indicates the potential of these Ni1−xLixO NPs for use in water treatment applications.