Influence of iron-containing components in facade coatings on their ability to self-cleaning

The article examines the effect of iron oxide additives on the self-cleaning ability of mineral façade materials. Two components of self-purification are considered: the decomposition of organic pollutants upon irradiation with light in the presence of a photocatalyst and photoinduced superhydrophilicity. Self-cleaning ability was determined by changing the contact angle of a drop on a surface coated with oleic acid before and after irradiation with light. Irradiation with light caused photocatalytic activity of iron compounds. Additives based on iron (III) oxide, compared to iron oxide (II, III), have higher photocatalytic activity, which leads to self-cleaning of the material surface. The use of iron-containing additives in excess of optimal values leads to a decrease in the efficiency of self-purification, probably due to the high degree of recombination of electron-hole pairs and agglomeration of additive particles. Additionally, iron oxide additives promote hydrophobization of the surface of materials, which can reduce the self-cleaning effect in practice, because for such coatings, the second component of self-cleaning, based on the superhydrophilicity function, does not work.
Author: P.I. Kiyko, T.N. Chernykh

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