Active photocatalytic-superhydrophobic coating with TiO2-ZnO nano-heterostructures for lime mortars

Abstract

Nano-heterostructures of TiO2-ZnO (50:50 and 10:90) were obtained by Flame Spray Pyrolisis as photocatalytic agents with expanded sensitivity towards solar light, instead of the restricted UV dependence of the pure TiO2 or ZnO. A superhydrophobic medium was simultaneously prepared and photocatalytic nanoparticles were added to obtain active coatings to be applied onto hardened surfaces of lime rendering and masonry mortars and stones. The coatings were expected to prevent the water absorption of the substrates and the subsequent degradation effects as well as to act as self-cleaning materials, reducing the dirt deposition and the biological colonization. Dispersions were applied onto the surface of lime mortars and siliceous stone. Measurements of the photocatalytic oxidation activity of the coatings were carried out by means of the NO degradation, showing a very good efficiency of the nanoparticles even at long term tests (values of NO oxidation of ca. 35 %). Water contact angle assessment evidenced a strong hydrophobization of the treated surfaces, with WCA values higher than 140°. The results proved the synergistic effect of these coatings with respect to the durability of the treated substrates.