Open AccessPreparation and characterization of protective self-cleaning TiO<sub>2</sub>/kaolin composite coating
Author(s) -
Vojo Jovanov,
Vladan Zecevic,
Tatjana Vulić,
J. Ranogajec,
Emilija Fidanchevski
Publication year - 2018
Publication title -
materiales de construcción
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.539
H-Index - 30
eISSN - 1988-3226
pISSN - 0465-2746
DOI - 10.3989/mc.2018.08517
Subject(s) - materials science , photodegradation , photocatalysis , rhodamine b , composite number , coating , porosity , composite material , durability , surface roughness , characterization (materials science) , chemical engineering , nanotechnology , catalysis , chemistry , organic chemistry , engineering
The application of self-cleaning coatings presents one of the most effective ways to protect the surfaces of the building materials. The effect of TiO2/kaolin based coatings applied to three types of substrates: non-porous, porous and highly porous, was investigated. Mechanical activation was applied for the impregnation of the active TiO2 component (in content of 3 and 10 wt. %) into the kaolin support. Surface properties (roughness, hydrophilicity and micro-hardness) and functional properties (photocatalytic activity and self-cleaning efficiency) were studied in order to define the optimal formulation of the applied coatings. The effect of the photocatalytic behavior of the coated substrates in terms of self-cleaning ability was assessed by the photodegradation of Rhodamine B, performed before and after durability tests. The results obtained in this paper showed that photocatalytic activity of the TiO2/kaolin composite coating generally depends on the procedure of TiO2 impregnation into the kaolin clay and the loaded TiO2 content.