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<p>This study investigates a novel spiral-shaped magnesium-TiO₂ photocatalyst developed via electrophoretic deposition of TiO₂-P25 nanoparticles onto chemically-etched, metallic magnesium substrate. The surface-nanostructured magnesium (NS-Mg) was initially explored for its photocatalytic efficiency in degrading Acid Yellow 99 (AY99) dye; therefore, it was chemically etched using acetic acid (CH<sub>3</sub>COOH) to expose a reactive surface with high surface area. However, despite its remarkable photocatalytic performance under UV light (254.4&#xa0;nm), achieving a kinetic rate constant of 0.02941&#xa0;min⁻<sup>1</sup> and over 95% AY99 removal within 150&#xa0;min, its rapid corrosion severely limited structural durability. To address this, a thin TiO₂-P25 film was deposited electrophoretically onto the NS-Mg surface, forming a corrosion-resistant photocatalytic system characterized by XRD-EDX, SEM, UV–Vis, BET, and EIS in 3.5 wt% NaCl. The coating maintained high UV activity (0.03286&#xa0;min⁻<sup>1</sup>) while significantly enhancing corrosion resistance. Under visible light, NS-Mg/TiO₂ showed superior efficiency (36.1%) compared to bare NS-Mg (21%), with a synergistic effect of 90.17%. These findings highlight a promising route for coupling light-driven catalysis with intrinsic corrosion resistance for long-term stability in magnesium based-systems.</p> Graphical Abstract <p></p>

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Surface-nanostructured spiral TiO2-Coated magnesium for intensified photocatalytic degradation of Azo dye

  • 期刊论文

  • 发表日期：

    2026年2月26日

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  • Amina Bousireb,
  • Fatiha Ahmedchekkat,
  • Mahdi Chiha,
  • Nesrine Bougouizi

摘要

This study investigates a novel spiral-shaped magnesium-TiO₂ photocatalyst developed via electrophoretic deposition of TiO₂-P25 nanoparticles onto chemically-etched, metallic magnesium substrate. The surface-nanostructured magnesium (NS-Mg) was initially explored for its photocatalytic efficiency in degrading Acid Yellow 99 (AY99) dye; therefore, it was chemically etched using acetic acid (CH3COOH) to expose a reactive surface with high surface area. However, despite its remarkable photocatalytic performance under UV light (254.4 nm), achieving a kinetic rate constant of 0.02941 min⁻1 and over 95% AY99 removal within 150 min, its rapid corrosion severely limited structural durability. To address this, a thin TiO₂-P25 film was deposited electrophoretically onto the NS-Mg surface, forming a corrosion-resistant photocatalytic system characterized by XRD-EDX, SEM, UV–Vis, BET, and EIS in 3.5 wt% NaCl. The coating maintained high UV activity (0.03286 min⁻1) while significantly enhancing corrosion resistance. Under visible light, NS-Mg/TiO₂ showed superior efficiency (36.1%) compared to bare NS-Mg (21%), with a synergistic effect of 90.17%. These findings highlight a promising route for coupling light-driven catalysis with intrinsic corrosion resistance for long-term stability in magnesium based-systems.

Graphical Abstract