nanoparticles were synthesized by a hydrothermal method from SnCl4•5H2O precursor and hydrazine hydrate (N2H4•H2O) in pH 12 medium in an autoclave at 135 º C for 24 h from our previous study . For the synthesis of g-C3N4, we conducted an annealing melamine (C3H6N6) in the muffle furnace with the ramping rate of 2 ºC/min at 550 ºC for 4 h.