Z-scheme 3 D g-C3N4/TiO2-x Heterojunctions with High Photocatalytic Efficiency

The 3D network structure composed of g-C(3)N(4)nanorods was prepared via treatment of bulk g-C(3)N(4)with hot HNO(3)followed by adjustment the pH and lyophilization. Then the 3D g-C3N4/TiO(2-x)heterojunctions with a strong interface was constructed via loading TiO(2-x)nanoparticles onto the 3D g-C(3)N(4)networks under hydrothermal conditions. The structure and morphology of the 3D g-C3N4/TiO(2-x)heterojunctions was characterized by infrared spectrum (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and field emission transmission electron microscope (TEM). The photo-degradation rate of Doxycycline HCl for 3D g-C3N4/TiO(2-x)heterojunction is about 4 times of that original bulk-C(3)N(4)and 2.75 times of 3D g-C3N4. The improved photocatalytic efficiency is attributed to 3D g-C(3)N(4)networks, which provides the more transfer channel to accelerate the electron transportation and the strong heterointerface between g-C(3)N(4)and TiO(2-x)which promotes the separation of the electron-holes. Besides, more adsorption capacity of the pollutant onto the 3D g-C3N4/TiO(2-x)also contributed to this high efficiency.