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<p>Photocatalytic oxidation technology is a promising solution for indoor air purification, requiring immobilized photocatalysts for practical use in continuous flow reactors. This study evaluates the photocatalytic performance of a P25-powder modified sol–gel TiO<sub>2</sub> coating on various metal substrates. Photocatalytic activity was assessed via removal efficiency (RE) (%) and removal rate (RR) (µmol/m<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11356_2025_36642_Article_IEq1.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="8" /> </InlineMediaObject> <EquationSource Format="TEX">\(^{2}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mn>2</mn> </mmultiscripts> </math></EquationSource> </InlineEquation>/h) for acetaldehyde conversion. The results showed that a double-layered coating on a stainless steel substrate achieved the highest RE and RR, while maintaining strong adhesion between coating and substrate. Varying the inlet acetaldehyde concentration (1 to 10 ppmv) and relative humidity (27 to 65%) revealed that relative humidity enhanced both parameters, while concentration had opposing effects on RE and RR. Additionally, a computational fluid dynamics model was used to derive key photocatalytic parameters of the two-layered coating on stainless steel, providing insights that support its application in functional air-purifying photocatalytic reactors.</p>

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Evaluation of TiO2 photocatalytic coating on metallic substrates: influence of substrate type, coating layers, and operational conditions

  • 期刊论文

  • 发表日期：

    2025年6月20日

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  • Donja Baetens,
  • Megha Ramteke,
  • Ali Zain Ul Abadeen,
  • Arno Raes,
  • Siegfried Denys

摘要

Photocatalytic oxidation technology is a promising solution for indoor air purification, requiring immobilized photocatalysts for practical use in continuous flow reactors. This study evaluates the photocatalytic performance of a P25-powder modified sol–gel TiO2 coating on various metal substrates. Photocatalytic activity was assessed via removal efficiency (RE) (%) and removal rate (RR) (µmol/m \(^{2}\) 2 /h) for acetaldehyde conversion. The results showed that a double-layered coating on a stainless steel substrate achieved the highest RE and RR, while maintaining strong adhesion between coating and substrate. Varying the inlet acetaldehyde concentration (1 to 10 ppmv) and relative humidity (27 to 65%) revealed that relative humidity enhanced both parameters, while concentration had opposing effects on RE and RR. Additionally, a computational fluid dynamics model was used to derive key photocatalytic parameters of the two-layered coating on stainless steel, providing insights that support its application in functional air-purifying photocatalytic reactors.