Nanocomposite Photocatalyst Based on Layered Double Hydroxides (LDHs) Associated with TiO₂

Abstract:

The surfaces of building materials are constantly exposed to the actions of environmental factors, pollutants of inorganic and organic origin as well as to microorganisms, which significantly contribute to corrosion phenomena.The application of coatings decreases the negative action of the pollutants minimizing their direct contact with the substrate. Different types of coatings with additional functions have been developed. A specific problem of these applications is the lack of compatibility of the photocatalysts with the surface of the building materials and the detachment of potentially toxic TiO₂ nanoparticles. In the present study, this problem was solved by the proper immobilization of TiO₂ nanoparticles onto the photocatalyst support, layered double hydroxides (LDHs). The newly formed coating possesses acceptable porosity for a porous building material (porosity within the range of 30-46 %) and satisfied photocatalytic activity, as well as mineralogical compatibility with the substrates (mortars, renders, bricks). Additionally, a positive effect considering the self-cleaning phenomenon was attained.

• Periodical: Advances in Science and Technology (Volume 92)
• Pages: 100-109
• DOI: https://doi.org/10.4028/www.scientific.net/AST.92.100
• Online since: October 2014
• Authors: Jonjaua Ranogajec*, Andrijana Sever-Skapin, Ognjen Rudic, Snezana Vucetic
• Keywords: Building Material, Durability, Photo-Induced Hydrophilicity, Self-Cleaning, Surface Properties, TiO₂/LDH Solution

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