Black composites photocatalyst coatings of K2Ti6O13-TiO2/TiC with nano-sheet flower-like structure by heat treatment in molten salt

Black photocatalyst coatings of 6-potassium titanate (K2Ti6O13) and anatase TiO2 were formed on the surface of TiC coatings by low-temperature heat treatment in molten salt of KNO3 at 673 K for 3 h. The surface of the composite coatings of K2Ti6O13-TiO2/TiC shows the nano-sheet flower-like structure, which could substantially increase the accessible surface area, compared with that of composite coatings of K2Ti6O13/Ti by the same treatment for Ti coatings. The composite coatings of K2Ti6O13-TiO2/TiC obtain high and stable adsorption, and still show photocatalytic activity. The results show that the low-temperature treatment in molten salt is a simple and effective approach to fabricate catalyst with nano-sheet K2Ti6O13.