Abstract
Similar to common building materials, TiO2 self-cleaning construction materials are exposed to the impact of humidity during their life cycle. This factor influences their photocatalytic stain removal, compromising their successful commercialization. The effect of relative humidity (RH) on the stain removal performance of porous and non-porous TiO2 self-cleaning coatings is presented. Results showed that humidity influences the hydration of clean TiO2 coatings and the photocatalytic activity due to this condition, but has less influence when a stain is already covering the coating. The porous and non-porous coatings present the best performance at RH ≥35.1% and RH = 53.4%, respectively.
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