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<p>Green-synthesized iron oxide nanoparticles (IONPs) were prepared with the assistance of <i>Camellia sinensis</i> extract and supported at varying loadings on TiO<sub>2</sub> anatase phase doped with 10&#xa0;mol% CeO<sub>2</sub>. These composite materials were investigated as catalysts for the photodegradation of the azo dye methyl orange under UV irradiation. Characterization revealed the formation of amorphous FeO<sub>x</sub> nanoparticles, functionalized by polyphenolic compounds from the extract. A progressive decrease in the band gap energy was observed with increasing iron content, ranging from 2.98 to 1.19&#xa0;eV. Photocatalytic degradation followed a pseudo-first order kinetic model, with up to 95% dye removal achieved after 120&#xa0;min of UV exposure. The catalyst with 1.9 wt% Fe exhibited optimal performance, demonstrating significantly enhanced photocatalytic activity due to improved light absorption and charge separation.</p> Graphical abstract <p></p>

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Photodegradation of methyl orange catalyzed by green synthesized iron oxide supported on TiO2-0.1CeO2

  • 期刊论文

  • 发表日期：

    2025年6月25日

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  • Ana Paula Nazar de Souza,
  • Bruno A. T. Menezes,
  • Luana de Souza Gaspar,
  • Juliana Fonseca de Lima,
  • Nakédia M. F. Carvalho

摘要

Green-synthesized iron oxide nanoparticles (IONPs) were prepared with the assistance of Camellia sinensis extract and supported at varying loadings on TiO2 anatase phase doped with 10 mol% CeO2. These composite materials were investigated as catalysts for the photodegradation of the azo dye methyl orange under UV irradiation. Characterization revealed the formation of amorphous FeOx nanoparticles, functionalized by polyphenolic compounds from the extract. A progressive decrease in the band gap energy was observed with increasing iron content, ranging from 2.98 to 1.19 eV. Photocatalytic degradation followed a pseudo-first order kinetic model, with up to 95% dye removal achieved after 120 min of UV exposure. The catalyst with 1.9 wt% Fe exhibited optimal performance, demonstrating significantly enhanced photocatalytic activity due to improved light absorption and charge separation.

Graphical abstract