Self-cleaning, photocatalytic films on aluminum plates for multi-pollutant air remediation: promoting adhesion and activity by SiO₂ interlayers

In recent years, nanoparticles have come under close scrutiny for their possible health and environmental issues, making them less attractive photocatalytic applications in air or water purification. Replacing free nano-powders with active stable films is thus a fundamental step towards developing effective devices. Aluminum represents cheap technologically-relevant substrate, but its been hampered by adhesion issues metal ion diffusion within the layer. this work, use of silica interlayers investigated as strategy to promote adhesion, efficiency reusability TiO2 deposited on aluminum plates. Films were prepared from titania sols avoid nano-powders. substrates different surface morphology role interlayer thickness was studied. extensively characterized, studying structure, morphology, optical properties, hardness. Self-cleaning properties studied respect superhydrophilicity ability resist fouling via alkylsilanes. Photocatalytic degradation tests also carried out using both volatile organic compounds (VOC) NOx, recycle tests. The presence proved crucial film robustness activity. substrate determines optimal thickness, especially terms reusability.