Graphitic carbon nitride (g-C3N4) has recently been received much attention in the field of photocatalysis such as hydrogen evolution [1], CO2 reduction [2] and photodegradation of organic pollutants [3] due to its nontoxic,high-efficiency and chemical stability.As to the photodegradation of organic dyes in aqueous system, g-C3N4 exhibits higher visible light photocatalytic activity in comparison with that of conventional photocatalyst like C-doped TiO2 [4].