I guess I didn't ask my question clearly. I want to synthesize g-C3N4 network (as a support) through a route involving graphene/graphite and also nitrogen-containing precursors like; amines, N-oxides, nitric/nitro acid, etc. to be used. I want graphene/graphite to be certainly used as one of the precursors (and of course a suitable nitrogen-based precursor should be present). That's what I seek for.