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The g-C 3 N 4 -coupling TiO 2  photocatalysts with controllable particle size as well as the interface contact were prepared by a general nonaqueous sol-gel method. The structural and morphological features of g-C 3 N 4 /TiO 2  were investigated through the X-ray diffraction, Fourier transformed infrared spectra, scanning electron microscopy and transmission electron microscopy, respectively. It is found the TiO 2  nanoparticles with a size of 7.3 ± 1.6 nm are uniformly anchored on the surface of the g-C 3 N 4  nanosheets in isolation. The photocatalytic properties of as-prepared g-C 3 N 4 /TiO 2  were tested by degradation of Rhodamine B (RhB) under visible light, and an enhanced activity is observed. The mechanism of the enhanced activity was further investigated through N 2  adsorption-desorption isotherms, UV-vis spectra, photoluminescence spectra, photoelectrochemical measurements, radical trapping experiments and X-ray photoelectron spectroscopy. Furthermore, the photocatalytic performances of obtained g-C 3 N 4 /TiO 2  under sunlight were also evaluated in aspects of degradation efficiency and stability. The results indicate that the obtained g-C 3 N 4 /TiO 2  is one promising photocatalyst for practical applications. The study of as-prepared g-C 3 N 4 /TiO 2  also implies that the present method could be a general route of g-C 3 N 4 -coupling photocatalysts.

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A general nonaqueous sol-gel route to g-C3N4-coupling photocatalysts: the case of Z-scheme g-C3N4/TiO2 with enhanced photodegradation toward RhB under visible-light