Abstract
The series porous graphitic carbon nitride (pg-C3N4) materials have been prepared by pyrolysis of dicyandiamide in air using urea as bubble template. The surface area of as-prepared pg-C3N4 was increased from 5.4 to 60m2g−1 by increasing the mass ratio of urea/dicyandiamide and calcination temperature. We have found that thus-produced nanostructures can display efficient photocatalytic performance for the photodegradation of methylene blue (MB) and phenol pollutant when energized with visible light. The photocurrent and photocatalytic activities of as-synthesized pg-C3N4 were increased with the higher proportion of urea and calcination temperature under visible light irradiation. Compared with the bulk g-C3N4, the optimum photocatalytic activity of our synthesized pg-C3N4 displays a significant enhancement by a factor of 2.1 and 2.8 for MB and phenol, respectively. The separation and migration efficiency of photogenerated electron–hole pairs were improved by the porous structure, which resulted in the enhancement of photocatalytic performances.
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