Pt@g-C_3N_4/CeO_2 photocatalyst for the remediation of low concentration NO_x at room temperature

Pt@g-C_3N_4/CeO_2 photocatalyst was prepared by calcination of g-C_3N_4/CeO_2 mixture followed by impregnating Pt. Under the irradiation of visible light with the presence of water vapor at room temperature, Pt@g-C_3N_4/CeO_2 showed significant performance for remediation of NO_x. The deNO_x mechanism was studied by modified in-situ FTIR. The results proved that NO was prone to adsorb on the surface of Pt@CeO_2 and oxidized to nitrite for storage. Then, the photoinduced hydrogen on Pt@g-C_3N_4 component could diffuse into the vicinity of nitrite through the spillover effect of Pt and reacted with nitride to produce N_2 and H_2O.