Abstract
Porous graphitic carbon nitride (g-C3N4) has been synthesised by means of one-step calcinations of dicyandiamide for efficient photocatalysis under visible light irradiation (λ > 400 nm). Scanning electron microscopy images demonstrate that the as-prepared photocatalyst calcined at 650°C is a porous structure. The UV–vis diffuse reflectance spectra show that the optical absorption for the porous g-C3N4 is more intensive than for common g-C3N4 calcined at 550°C. The enhanced generation of the photocurrent under visible light irradiation (λ > 400 nm) is observed by using the porous g-C3N4. The results of the photocatalytic experiments under visible light irradiation reveal that the photocatalytic degradation of methylene blue using the porous g-C3N4 is higher than common g-C3N4, showing the advantage of the structure for efficient photocatalysis. The presence of the calcinations temperature is presumed to play a key role in adjusting the textural properties.
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