Synthesis high specific surface area nanotube g-C 3 N 4 with two-step condensation treatment of melamine to enhance photocatalysis properties

High specific surface area nanotube g-C 3 N 4 was fabricated by a simple two-step condensation method. Photocatalytic activity was evaluated by decomposition of Rhodamine B (Rh B) under visible light. Nanotube g-C 3 N 4 showed 12 times higher photocatalytic activity than bulk g-C 3 N 4 . The improvement of photocatalytic activity was mainly due to the higher surface area, the unique morphology and the number of defects.