Abstract: Aiming at the problem that   the visible light absorption and active site exposure capacity of graphitic phase carbon nitride (g-C₃N₄ or CN) were limited,  and the photogenerated carriers were easy to recombine,  which  limited the activity of CN-based photocatalytic materials. A new type of diphenylaminourea doped CN (BCN) photocatalyst was  prepared by a  one-step thermal polymerization method using urea as a precursor and diphenylaminourea as dopant. The BCN photocatalyst was characterized by using nitrogen adsorption-desorption test,  Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), ultraviolet-visible spectroscopy (UV\|Vis DRS), photolumine-scence spectroscopy (PL),  electrochemical impedance spectroscopy (EIS). The results show that compared with CN, the BCN photocatalyst can significantly improve visible-light absorption capacity and separation efficiency of photogenerated electron-hole pair,  and the specific surface area is about twice that of the original.   The hydrogen production rate of the BCN photocatalyst under visible light irradiation is 588.7 μmol/(h·g),  which is about  twice that of  the original CN,  and the photodegradation rate is 74% for tetracycline,  corresponding  to rate constant of about  1.5 times that of the original CN. This research results can provide useful references  for the development of novel CN photocatalysts,   hydrogen energy production and antibiotic pollution remediation.

Key words: graphite phase carbon nitride,  , photocatalysis,  , diphenylaminourea,  , hydrogen production, tetracycline,  , degradation