Photocatalytic and Protective Thin Films for Enhanced Self‐cleaning Activity and Durability of Painted Steel Roofings

Fouling of painted steel roofings over time due to biological organisms and other pollutants is a well-known aesthetic, functional environmental problem that highlights the importance developing greener self-cleaning technologies for roofing applications. Accordingly, series novel photocatalytic coating systems have been developed in this study by introducing copolymer tetratethyl orthosilane methyltrimethoxysilane as photochemically stable binder intermediate protective layer. Visible light active carbon doped titanium dioxide surface modified nano with anatase-rutile hetero junctions were used semiconductor photocataysts. The concentration was set 10 %, 25 % 40 weight dried film. Methylene blue photoderadation reaction kinetics antimicrobial assays key measures assessing performance. morphological chemical composition changes analyzed function using scanning electron microscopic spectroscopic techniques measure service life these putative systems. According, high degree activity observed having (w/w) loading compared control sample. A complete eradication 2–3 orders log reduction achieved respectively against E.coli bacteria A.niger Cladosporium fungies. introduction polysiloxane layer has significantly enhanced both life, minimizing diffusion photogenerated reactive oxygen species into subsequent underneath paint layers. rate photodegradation increased concentration. system found be optimum formulation obtain at minimum study.