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

doi:10.3724/SP.J.1077.2012.00033

Abstract

Abstract:

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/TiO₂composite 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.

Key words: transition metal, TiO₂, photocatalysis, fluidized bed, CNT

CLC Number:

TB383

MA Lei, CHEN Ai-Ping, LU Jin-Dong, HE Hong-Bo, LI Chun-Zhong. Synthesis and Photocatalytic Properties of CNT/Fe-Ni/TiO₂ by Fluidized Bed-chemical Vapor Deposition Method[J]. Journal of Inorganic Materials, 2012, 27(1): 33-38.

Figures/Tables 5

Fig. 1 XRD patterns of Fe-Ni/TiO2 and CNT/Fe-Ni/TiO2

Fig. 2 FESEM images of CNT/Fe-Ni/TiO2

Fig. 3 UV-Vis absorption spectra of the samples

Fig. 4 Photocatalytic degradation of different sample on methylene blue

Fig. 5 Mechanism for the synergistic effects after growing CNT

References 17

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

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