Nitrogen-doped hydrothermal carbon/graphene composite membrane as well as preparation method and application thereof

The invention belongs to the field of biomass carbon films, and particularly relates to a nitrogen-doped hydrothermal carbon/graphene composite film as well as a preparation method and application thereof. The nitrogen-doped hydrothermal carbon/graphene composite film is an amorphous structure lamellar film with the surface containing hydroxyl, carbonyl, ether group, imino group and cyano group, the film thickness is 20-80 [mu] m, the distance between carbon lamellar layers is 0.88-0.95 of ID/IG of Raman spectrum, and the nitrogen content is 3.0-15.06 wt%. The composite membrane has specific thickness, carbon sheet interlayer spacing, ID/IG and nitrogen content indexes, the surface contains hydroxyl, carbonyl, ether, imino and cyano functional groups, and the site activity is high. A heavy metal removal experiment shows that the membrane material with the structure has a good removal effect on heavy metal ions in wastewater and has a relatively good industrial application prospect. 本发明属于生物质碳膜领域，具体涉及一种氮掺杂水热碳/石