A photocatalytic composition comprising: (a) at least one aerial binder； (b) at least one photocatalyst； (c) at least one cellulose ether； (d) at least one fluidizing agent； (e) at least one pumice in the form of micronized powder； (f) at least one barite in the form of micronized powder. This composition can be used as water-based paint for preparing wall coatings having a very low thickness, in particular for interior applications, which guarantee a high photocatalytic effect and stable with time, even with relatively low quantities of photocatalyst, normally lower than 10% by weight. This coating also has marked inhibitory properties with respect to the growth of mold and bacteria on wall surfaces.
