عنوان مقاله [English]
The first report of Graphene Quantum Dots (GQDs) as novel and highly efficient nano materials for degradation of Arsenazo(III) dye under visible light, is presented here. Preparation of GQDs was carried out by pyrolyzing method. The transition electron microscopy (TEM) and UV–Vis spectroscopy were used for characterizing the GQDs. Effect of the experimental parameters such as pH of dye solution, contact time, concentration of Arsenazo (III) dye and amount of GQDs on the degradation efficiency of dye were studied. The removal efficiency in optimum conditions including pH=4 contact time=120 minutes, the concentration of dye= 45 mg.L-1 and in presence 600 µL GQDs, was observed More than 90%. In general, GQDs had a good performance in dye removal. Finally, the kinetic model for degradation of Arsenazo (III) in the presence of GQDs was discussed. The possible mechanism of visible light photocatalytic degradation is also proposed.