Preparation method and application of g-C3N4 containing three-coordination nitrogen vacancies

The invention discloses a preparation method of g-C3N4 containing three coordination nitrogen vacancies and application of the g-C3N4 containing the three coordination nitrogen vacancies. The g-C3N4 containing the three-coordination nitrogen vacancy is prepared from sodium sulfide or potassium sulfide and various precursors such as melamine, thiourea, urea, dicyandiamide and cyanamide through a one-step co-calcination method, the method is simple and easy to implement, does not need complex equipment, is suitable for industrial production, and can be used for preparing the g-C3N4 containing the three-coordination nitrogen vacancy. The application field belongs to the technical field of environmental remediation materials and advanced oxidation. The g-C3N4 containing the three-coordinate nitrogen vacancies is used as a carrier, transition metals such as copper are doped on the surface of the carrier, a Fenton-like catalyst with excellent performance can be prepared, the Fenton-like catalyst is used for degradi