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<p>TiO<sub>2</sub> catalytically active coating on TC4 titanium alloy was prepared through plasma electrolytic oxidation (PEO) utilizing aqueous electrolytes. The elemental and phase composition, microstructure, and catalytic performance of the coating was characterized by EDS, XRD, SEM, UV-Vis, TOC, and COD methods, respectively. The coating, with a surface porosity of 20%, primarily consists of rutile-type TiO<sub>2</sub> and amorphous vanadium compounds. The catalysis originates from the synergistic interaction between the porous TiO<sub>2</sub> coating and ozone activation, where the plasma-electrolytic porous architecture enhances surface adsorption and radical-mediated from ozone decomposition reaction pathways. Combined with ozone oxidation, the coating exhibits excellent catalytic performance in degrading methyl orange (MO), and the degradation rate has been increased. Notably, the catalyst showed the most significant effect in catalytic ozonation of a 10&#xa0;mg/L MO, achieving a degradation rate of up to 95.6% in 60&#xa0;min, representing 71.8% enhancement compared to ozone oxidation. What’s more, the result of TOC and COD jointly confirms that the PEO catalytic coating exhibits high efficiency for the catalytic degradation of low-concentration MO solution. This study establishes a potential application in advanced oxidation processes for the degradation of organic pollutants.</p> Graphical Abstract <p></p>

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Plasma Electrolytic Oxidation Coating as an Alternative Support for TiO2 Catalysts in Catalytic Ozonation

  • 期刊论文

  • 发表日期：

    2025年11月16日

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  • Liya Wang,
  • Xuejun Cui,
  • Fengqi Wang,
  • Yuming Qi

摘要

TiO2 catalytically active coating on TC4 titanium alloy was prepared through plasma electrolytic oxidation (PEO) utilizing aqueous electrolytes. The elemental and phase composition, microstructure, and catalytic performance of the coating was characterized by EDS, XRD, SEM, UV-Vis, TOC, and COD methods, respectively. The coating, with a surface porosity of 20%, primarily consists of rutile-type TiO2 and amorphous vanadium compounds. The catalysis originates from the synergistic interaction between the porous TiO2 coating and ozone activation, where the plasma-electrolytic porous architecture enhances surface adsorption and radical-mediated from ozone decomposition reaction pathways. Combined with ozone oxidation, the coating exhibits excellent catalytic performance in degrading methyl orange (MO), and the degradation rate has been increased. Notably, the catalyst showed the most significant effect in catalytic ozonation of a 10 mg/L MO, achieving a degradation rate of up to 95.6% in 60 min, representing 71.8% enhancement compared to ozone oxidation. What’s more, the result of TOC and COD jointly confirms that the PEO catalytic coating exhibits high efficiency for the catalytic degradation of low-concentration MO solution. This study establishes a potential application in advanced oxidation processes for the degradation of organic pollutants.

Graphical Abstract