Highly efficient nano-graphite doped TiO2 photo-catalyst with unique sea-island structure under visible light
Nano-graphite doped TiO2 composite, C-TiO2, was fabricated by atomic layer deposition (ALD) of TiO2 onto carbon fiber fabrics (CFFs), followed by the calcination approach. The morphology and structure of composited C-TiO2 was characterized by various techniques. The photo-catalytic activity of C-TiO2 was compared with that of commercial P25. Results revealed that the nano-graphite/TiO2 “islands” with diameters of ~5.5 nm were uniformly dispersed inside graphite “sea” with size of around 840 nm. Nano-graphite sheets closely contacted with TiO2, which formed Ti-O-C bonds between Nano graphite and TiO2. C-TiO2 showed 2.1 times photo-catalytic activity of that of P25 and reported C-TiO2 composite under visible light. The C-TiO2 could effectively degrade MB at a removal ratio up to 93.1% even after 6 cycles of repeated usage.