Abstract: Disclosed in an air purification device comprising a case that contains at least a first filtering system including an M6 filter according to standard EN1822, a second filtering system including UV-C lamps, and a third filtering system. The second filtering system is situated between the first filtering system and the third filtering system, the UV-C light of the lamps sterilising the air flow that passes through the second filtering system. The UV-C light of the lamps has a powerful destructive effect on the DNA chains of microorganisms or cells retained in the first filtering system and the third filtering system and also on those of microorganisms or cells in the space delimited between the first filtering system and the third filtering system.

Abstract: The process is characterised in that it comprises at least one sol-gel layer with a maximum thickness of 800 nm, where said sol-gel layer comprises nanoparticles with a laminar crystal structure, and where each sol-gel layer is obtained from a silicon alkoxide solution; preparation of a dispersion that comprises at least one type of particles with a spherical, fibrillar or laminar morphology, and a laminar crystal structure, wherein at least one of the dimensions, thickness or diameter, of said particles is less than 400 nm; addition of the dispersion prepared to the solution; deposition of the suspension on said substrate; thermal treatment of the substrate; and, in the case of multilayer coatings, optionally, the addition of high-dimensional particles and repetition of the steps, provided that the thermal treatment of the last layer, or outer layer, is performed at a temperature equal to or greater than that of the preceding layer. The invention also relates to the sol-gel coating thus obtained.