Abstract
Cu doped g-C3N4 nanosheets are synthesized by a facile process of calcining dicyandiamide, ammonium chloride (NH4Cl) and copper chloride (Cu(II)Cl2) at N2 environment. XRD, FTIR and XPS results indicate that the Cu species coordinated in the pore among three tri-s-triazine units at the states of Cu2+/Cu+, expanding visible light absorption and narrowing the bandgap of g-C3N4. The degradation rate is about 2.3 times higher than that of pristine g-C3N4. DFT calculations show that the doped Cu2+ ion acts as the strong reduction site, while the doped Cu+ as the strong oxidation site. Thus the Cu2+/Cu+ doping facilitates the photoinduced charge transfer by forming the S-S Z-scheme heterojunction of photosystem Cu2+ doped g-C3N4 (PSI) and Cu+ doped g-C3N4 (PSII).
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