Fabrication of TiO2/CdS Coaxial Heterojunction and Its Photocatalytic Properties

doi:10.3724/SP.J.1077.2013.12323

Abstract

Abstract:

TiO₂ nanotube arrays on titanium sheet were prepared by anodized oxidation method and filled with CdS in the interior of the annealed TiO₂ nanotubes by direction current (DC) electrodeposition. The TiO₂/CdS heterojunctions were characterized through scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and X-Ray diffraction (XRD). The results show that TiO₂/CdS coaxial nanocables are orderly arrayed, their diameters are uniform and the chemical ratio of Cd and S is closed to 1:1. The TiO₂ annealed at 450℃ in air is anatase and the deposited CdS is hexagonal phase. UV-visible absorption spectroscopy and methyl orange dye by photocatalytic degradation under UV light of the pure TiO₂ nanotubes and TiO₂/CdS heterojunction are investigated. Compared with the pure TiO₂, TiO₂/CdS heterojunction has an obvious red-shift on the edge of TiO₂ absorption and their photocatalytic activity is obviously improved, with maximum degradation rate of methyl orange as 99.4%.

Key words: titanium dioxide, cadmium sulfide, heterojunction, electrodeposition, photocatalysis

CLC Number:

TB383

CAI Si-Long, SONG Ping-Xin, ZHANG Ying-Jiu, WANG Cai-Li, ZHANG Yue-Ping, AN Lu-Lu. Fabrication of TiO₂/CdS Coaxial Heterojunction and Its Photocatalytic Properties[J]. Journal of Inorganic Materials, 2013, 28(4): 431-435.

Figures/Tables 7

Fig. 1 SEM images of samples

Fig. 2 EDS spectrum of TiO2 nanotube arrays after electrochemical deposition of CdS

Fig. 3 XRD patterns of the samples

Fig. 4 UV-Vis absorption spectra of (a) TiO2 and (b) TiO2/CdS

Fig. 5 Absorption cuve of methyl orange solution with degradation time

Fig. 6 Effect of CdS deposition time on the degradation rate

Fig. 7 Effect of methyl orange concentration on the degradation rate

References 15

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Fabrication of TiO₂/CdS Coaxial Heterojunction and Its Photocatalytic Properties

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