Enhanced visible light photocatalytic activity of g-C₃N₄assisted by hydrogen peroxide

Water pollution has caused much attention nowadays. Photocatalysis as a kind of advanced oxidation technology has been widely studied in the field of environmental pollution control. As a stable non-metal photocatalyst, the photocatalytic activity of g-C 3 N 4 assisted by H 2 O 2 was investigated for the degradation of Rhodamine B (RhB) under visible light irradiation. The combination of g-C 3 N 4 and H 2 O 2 has much higher activity than that of pure g-C 3 N 4 or H 2 O 2 . Neutral solution is preferred for the high phtotocatalytic activity of g-C 3 N 4 with H 2 O 2 . The effect of the amount of catalyst, H 2 O 2 concentration and RhB concentration was investigated. Photocatalytic mechanism study using radical scavenger showed free radicals O 2 − and · OH are the main active species. g-C 3 N 4 assisted by H 2 O 2 showed good photostability and repeatability after five cycles of degradation experiment.