Figure 7

Absorption spectra of the undoped, B_C-, N_C-, S_C- and P_C+V_C-GR/Ag₃PO₄(100) composites for the polarization vector perpendicular to the surface.

The inset of shows that the N_C- and S_C-GR/Ag₃PO₄(100) composites display strong absorption in the range 550 to 750 nm. The higher resonant-like peaks at about 400~440 nm, due to doping, are especially beneficial to enhance the photocatalytic performance of the doped GR/Ag₃PO₄(100) composites, according to the fact that the light with wavelength of ~440 nm might be the most appropriate visible light for generation of radical species in the GR/Ag₃PO₄(100) composite. The N atom may be one of the most appropriate dopants for the GR/Ag₃PO₄ photocatalyst.