G-C3N4 nanosheet and preparation method and application thereof

The invention discloses a g-C3N4 nanosheet. The thickness of the nanosheet is 1-200nm and the specific surface area is 10-200m g. The invention further provides a preparation method of the g-C3N4 nanosheet and an application of the g-C3N4 nanosheet in photocatalytic degradation of phenol in the field of sewage treatment. The preparation method comprises the following steps of (1) grinding and mixing a carbon-nitrogen-containing organic matter and cyanuric acid to prepare a precursor; and (2) pouring the precursor into a crucible for burning and reacting to obtain the g-C3N4 nanosheet. The prepared g-C3N4 nanosheet can be widely applied to photodegradation of water, organic matter preparation and sterilization in the fields of energy, environments and medicine. The g-C3N4 nanosheet has a visible-light response, an appropriate band gap and high specific surface area, is a photodegradable material with good property, and solar energy can be efficiently utilized. The preparation method is economical, environm