▎ 摘　　要

NOVELTY - Coating layer comprises graphene and a photocatalyst. The photocatalyst layer includes graphene substrate. A titanium dioxide powder is impregnated in the graphene substrate. The thickness of the coating layer is 0.1-2 mm. The amount of titanium dioxide powder in the photocatalyst layer is 30-50 wt.%. USE - The coating layer is useful for removing nitrogen oxides. ADVANTAGE - The coating layer: prevents the deterioration of the coating properties; improves UV light absorption; solves the problem of peeling of the coating layer; and maximizes the photocatalytic effect.