The contact form of the heterojunction interface has an importance effect on interfacial photoelectron transfer and photocatalytic property. Here, C/C3N4 heterojunction with three types of interface contact between C and C3N4 have been constructed, including C/C3N4-I, C/C3N4-HI, C/C3N4-D. The physico-chemical properties of the prepared catalysts were characterized by TEM, XRD, XPS, Raman, FT-IR, UV-VIS DRS and UPS. The results indicate that the interface composition (Cg/Cs, Nt/Ns) and valence band characteristic of the photocatalysts are strongly dependent on the interface contact form of C and C3N4. Compared with the C/C3N4-HI and C/C3N4-D, the sample C/C3N4-I present higher ratios of Cg/Cs and Nt/Ns, stronger light response and appropriate band locations. These findings reveal that the C deposited on the surface of C3N4 promotes the efficiencies of light harvest and charge carrier separation, ultimately resulting in an enhanced photocatalytic performance for pure water splitting.
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