A method of creating a composite system with a photocatalytic function

摘要

A method of creating a composite system with a photocatalytic function consisting of a photocatalyst and a binder, wherein the photocatalyst is a non-agglomerated TiO₂ nanoparticle, undoped or doped, suspended in water or in a mixture of water with organic solvents or in the form of a powdered material, and where the binder is formed by SiO₂ nanoparticles in the form of a stabilized aqueous suspension. The synthesis of this composite system is based on the difference in the zero electric charge point (pH_zpc) of SiO₂ and TiO₂ nanoparticles, where the addition of buffer to the solvent sets such pH values that TiO₂ nanoparticles are charged positively, while the SiO₂ nanoparticles negatively, and where by selecting the ratio of the nanoparticle concentrations of the two kinds, after mixing their suspensions, optionally by mixing the powder form of TiO₂ nanoparticles into the stabilized aqueous suspension of SiO₂ nanoparticles, by the action of the different electric charges of SiO₂ and TiO₂ nanoparticles, TiO₂ nanoparticles are surrounded by the wall of SiO₂ nanoparticles that, after mutual contact, agglomerate into a mechanically stable shell of the resultant composite spatial formations.