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Abstract <p>Photocatalysis is crucial for treating water pollution and converting solar energy into electricity or chemical reactions. ZnO is widely used for its affordable and stable properties. Cobalt doping enhances the photocatalytic efficiency of ZnO, particularly in the visible spectrum. This study investigates cobalt-doped ZnO for degrading tartrazine dye under solar irradiation. The results maintain that doping alters the properties of ZnO, with an increase in specific surface area and a shift in the absorption peak towards longer wavelengths. Tartrazine (TAR) degradation is nearly complete in 180 min with ZnO:5%Co, retaining over 56% efficiency after four cycles. These promising results highlight the potential of cobalt-doped ZnO nanostructures for effective and sustainable photocatalysis.</p>

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Application of Cobalt-Doped ZnO for the Solar Photocatalytic Degradation of Tartrazine Dye

  • 期刊论文

  • 发表日期：

    2026年6月25日

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  • S. Mokhtari,
  • L. Aoudjit,
  • T. Saidani,
  • S. Habi ben hariz,
  • I. Djouabi,
  • G. Rekhila,
  • F. Ait Merzeg

摘要

Abstract

Photocatalysis is crucial for treating water pollution and converting solar energy into electricity or chemical reactions. ZnO is widely used for its affordable and stable properties. Cobalt doping enhances the photocatalytic efficiency of ZnO, particularly in the visible spectrum. This study investigates cobalt-doped ZnO for degrading tartrazine dye under solar irradiation. The results maintain that doping alters the properties of ZnO, with an increase in specific surface area and a shift in the absorption peak towards longer wavelengths. Tartrazine (TAR) degradation is nearly complete in 180 min with ZnO:5%Co, retaining over 56% efficiency after four cycles. These promising results highlight the potential of cobalt-doped ZnO nanostructures for effective and sustainable photocatalysis.