Some information might find in the following paper.
Surface modification of g-C3N4 by hydrazine: Simple way for noble-metal free hydrogen evolution catalysts
Chemical Engineering JournalIssue Date:2-Nov-2015
DOI:10.1016/j.cej.2015.10.080
http://hdl.handle.net/10754/581797
The graphitic carbon nitride (g-C3N4) usually is thought to be an inert material and it’s difficult to have the surface terminated NH2 groups functionalized. By modifying the g-C3N4 surface with hydrazine, the diazanyl group was successfully introduced onto the g-C3N4 surface