A water soluble photocatalytic material capable of being adhered to an article by a conventional coating process is described. The photocatalytic material includes a doped metal oxide substrate capable of exhibiting photocatalytic behavior on being exposed to visible light, wherein particle size of doped metal oxide substrate ranges from about 18 nanometer (nm) to about 35 nm. Further, the photocatalytic material includes a polymeric adhesive for improving the adhering property of the doped metal oxide substrate on the article. In addition, a process for producing the water soluble photocatalytic material is described. Further, an air purifying article, such as a sheet, on which the said photocatalytic material is applied to is also described.