Abstract
g–C3N4 nanosheets with porous structures (labelled PGN) were prepared by an extremely facile one-step, template-free method. The method used to prepare porous g–C3N4 nanosheets in this research was thermal polycondensation of urea pre-treated with ethanol. These nanosheets were compared with g–C3N4 agglomerates (labelled BG) prepared with raw urea. The pre-treatment process did not change the crystal structure of urea but changed the thermal polymerization process of urea to form g–C3N4. The change in the thermal polymerization process resulted in the formation of porous g–C3N4 nanosheets. The as-prepared PGN photocatalyst has an enlarged surface area of 66.0 m2 g−1 and a pore volume of 0.357 cm3 g−1, leading to enhanced visible light photocatalytic efficiency. The photocatalytic activity of g–C3N4 was evaluated by the photodegradation experiments with methylene blue (MB). The results indicated that PGN exhibited high and stable photocatalytic activity. The effective separation and transmission of photogenerated electron–hole pairs caused by precursor (urea) pre-treatment as well as the large BET surface area are associated with the enhanced photocatalytic activity of PGN.
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