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<p>Photocatalysts are crucial for environmental remediation due to their ability to generate reactive oxidizing species under light irradiation. In this study, zinc oxide (ZnO) ultrafine fibers were synthesized via electrospinning followed by calcination, and doped with nickel (Ni) and magnesium (Mg) to enhance their photocatalytic performance. The fibers maintained the wurtzite ZnO crystalline structure after doping, while exhibiting reduced crystallite size and, in some cases, increased surface area—factors that contributed to improved photocatalytic activity. Photocatalytic performance was evaluated through the degradation of methylene blue (MB) and crystal violet (CV) dyes under UV and solar irradiation. The sample doped with 8% Mg achieved over 90% degradation efficiency of MB under UV light. In contrast, the co-doped sample with 2% Mg and Ni showed enhanced activity under sunlight, highlighting its potential for solar-driven water treatment, including in reuse cycles. Characterization techniques including XRD, SEM, XPS, UV–Vis, PL, and BET supported these findings. These results demonstrate that metal-doped ZnO ultrafine fibers possess optimized structural and optical properties, making them promising candidates for sustainable environmental remediation technologies.</p> Graphical Abstract <p></p>

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Synthesis, Characterization, and Optical Properties of Mg²⁺ and Ni²⁺ Doped ZnO Ceramic Ultrafine Fibers

  • 期刊论文

  • 发表日期：

    2025年7月16日

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  • Leonardo G. de Medeiros,
  • Joyce M. P. Silva,
  • Alan J. L. de Melo,
  • Marcio D. Teodoro,
  • Mauricio R. D. Bomio,
  • Loong-Tak Lim,
  • Fabiana V. Motta

摘要

Photocatalysts are crucial for environmental remediation due to their ability to generate reactive oxidizing species under light irradiation. In this study, zinc oxide (ZnO) ultrafine fibers were synthesized via electrospinning followed by calcination, and doped with nickel (Ni) and magnesium (Mg) to enhance their photocatalytic performance. The fibers maintained the wurtzite ZnO crystalline structure after doping, while exhibiting reduced crystallite size and, in some cases, increased surface area—factors that contributed to improved photocatalytic activity. Photocatalytic performance was evaluated through the degradation of methylene blue (MB) and crystal violet (CV) dyes under UV and solar irradiation. The sample doped with 8% Mg achieved over 90% degradation efficiency of MB under UV light. In contrast, the co-doped sample with 2% Mg and Ni showed enhanced activity under sunlight, highlighting its potential for solar-driven water treatment, including in reuse cycles. Characterization techniques including XRD, SEM, XPS, UV–Vis, PL, and BET supported these findings. These results demonstrate that metal-doped ZnO ultrafine fibers possess optimized structural and optical properties, making them promising candidates for sustainable environmental remediation technologies.

Graphical Abstract