Graphite phase carbon nitride photocatalyst as well as preparation method, system and application thereof

The invention discloses a graphite phase carbon nitride photocatalyst as well as a preparation method, system and application thereof, graphite phase carbon nitride dispersion liquid and high-temperature preheated water are mixed in a reaction section through a continuous reaction system and are subjected to rapid high-temperature and high-pressure hydrothermal reaction, and graphite phase carbon nitride is subjected to continuous rapid high-temperature and high-pressure hydrothermal post-treatment to obtain the graphite phase carbon nitride photocatalyst. The more efficient graphite-phase carbon nitride photocatalyst is obtained. The graphite phase carbon nitride is subjected to continuous rapid high-temperature hydrothermal modification based on a continuous reaction system, the modification time is (25.2-50.3) s, the test result of photocatalytic water splitting hydrogen production shows that the activity is improved by 5.2 times compared with that before modification, and the graphite phase carbon nitride