Synthesis and Photocatalytic Properties of CNT/Fe―Ni/TiO2 by Fluidized Bed―chemical Vapor Deposition Method

Fe―Ni/TiO2 was used as catalyst to synthesize carbon nanotube(CNT)/Fe―Ni/TiO2 composite photocatalyst by fluidized bed chemical vapor deposition (FBCVD) method. Carbon nanotube grew in situ on TiO2 surface. The CNT/Fe―Ni/TiO2 composite photocatalyst were characterized by X―ray diffraction (XRD), UV―Vis absorption spectroscope and field emission scanning electron microscope (FESEM). The photocatalytic activities of prepared samples were investigated by the photodegradation of methylene blue (MB). The results showed that Ni was characterized as catalytic center for CNT growth in FBCVD process. In CNT/Fe―Ni/TiO2 composite photocatalyst, Fe (III) cation was characterized as an electron capture center and efficiently promoted the separation of photogenerated holes and electrons. The electron transfer from TiO2 was facilitated by Ni particles and CNTs, which could reduce the electron ― hole recombination. The synergistic effects of Fe―Ni and CNT significantly enhanced the photocatalytic activity of the catalysts. The degradation ratio of MB of CNT/Fe―Ni/TiO2 doped with 0.25mol% Fe and 4.75mol% Ni was increased about 70% than that of pure TiO2.