Poly(triazine imide) (PTI) is a materialbelonging to the group of carbon nitrides and has shown tohave competitive properties compared to melon or g-C3N4,especially in photocatalysis. As most of the carbon nitrides, PTIis usually synthesized by thermal or hydrothermal approaches.We present and discuss an alternative synthesis for PTI whichexhibits a pH-dependent solubility in aqueous solutions. Thissynthesis is based on the formation of radicals duringelectrolysis of an aqueous melamine solution, coupling ofresulting melamine radicals and the final formation of PTI. Weapplied different characterization techniques to identify PTI asthe product of this reaction and report the first liquid stateNMR experiments on a triazine-based carbon nitride. We showthat PTI has a relatively high specific surface area and a pHdependentadsorption of charged molecules. This tunable adsorption has a significant influence on the photocatalytic propertiesof PTI, which we investigated in dye degradation experiments.