Core-shell nanostructures with TiO2 core and aerogel SiO2 shell with controlled shell thickness and porosity were developed. Such surface modification aims protection and immobilization of TiO2 photocatalyst in different construction material substrates. Partial covering and porous shell structure allow "access" of the reactants and decomposition products to and from the TiO2 photocatalyst core.
Schematic total & partial cover of TiO2 with SiO2 aerogel (a) and TEM micrograph of partial cover of TiO2 nanoparticles with SiO2 aerogel (b) and (c).
The photonic efficiency in NO oxidation and NOx removal was higher in the samples with higher SiO2/TiO2 mass ratios equal to 0.3 and 0.5.