Photocatalyst coating

1. A photocatalytic composition comprising:

a photocatalyst comprising WO 3 ;

a co-catalyst comprising CeO 2 ; and

an adsorbent material.

2. The photocatalytic composition according to claim 1 , wherein the adsorbent material comprises solid acid and/or solid base.

3. The photocatalytic composition according to claim 1 , wherein the adsorbent material comprises at least one of ZrO 2 , activated carbon and Al 2 O 3 .

4. The photocatalytic composition according to claim 1 , where the photocatalyst is doped with at least one naturally occurring element.

5. The photocatalytic composition according to claim 1 , where the photocatalyst is loaded with a transition metal, a transition metal oxide, or a transition metal hydroxide.

6. The photocatalytic composition according to claim 5 , wherein the transition metal is Cu, Fe, or Ni.

7. The photocatalytic composition according to claim 1 , wherein the photocatalyst is loaded with a noble metal, a noble metal oxide, or a noble metal hydroxide.

8. The photocatalytic composition according to claim 7 , wherein the noble metal is Au, Ag, Pt, Pd, Ir, Ru, or Rh.

9. The photocatalytic composition according to claim 1 , wherein the co-catalyst comprises a binder.

10. The photocatalytic composition according to claim 1 , wherein the photocatalytic composition is capable of photocatalytically decomposing trimethylamine.

11. A photocatalytic layer comprising the photocatalytic composition according to claim 1 .

12. The photocatalytic layer according to claim 11 , further comprising a substrate, wherein at least a portion of the photocatalytic composition contacts the substrate surface.

13. A self cleaning material comprising the photocatalytic composition according to claim 1 .

14. A method of making a photocatalytic layer, comprising forming the photocatalytic composition of claim 1 ; and applying the photocatalytic composition to a substrate.

15. The method according to claim 14 , wherein the photocatalytic composition is applied to glass, wallboards, stone, masonry, metals, woods, plastics, other polymeric surfaces, concrete, fibers, textiles, yarns, or ceramics.

16. The method according to claim 15 , wherein the photocatalytic composition is applied by vapor deposition, chemical vapor deposition, physical vapor deposition, laminating, pressing, rolling, soaking, melting, gluing, sol-gel deposition, spin coating, dip coating, bar coating, brushing coating, sputtering, thermal spraying, flame spray, plasma spray, high velocity oxy-fuel spray, atomic layer deposition, cold spraying, or aerosol deposition.