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J. Korean Ceram. Soc. > Volume 51(3); 2014 > Article
Journal of the Korean Ceramic Society 2014;51(3): 162.
doi: https://doi.org/10.4191/kcers.2014.51.3.162
Sonophotocatalytic Performance of Bi2Se3-Graphene/TiO2 Hybrid Nanomaterials Synthesized with a Microwave-assisted Method
Lei Zhu, Sun-Bok Jo, Shu Ye, Kefayat Ullah, Won-Chun Oh
Department of Advanced Materials Science & Engineering, Hanseo University
This paper introduces a microwave-assisted synthesis method to prepare hybrid $Bi_2Se_3-GR/TiO_2$ nanocomposites, which exhibit superior properties over single component materials. The as-prepared composites were characterized by XRD, UV-vis absorbance spectra, SEM,TEM, EDX, and BET analyses, revealing uniform covering of the graphene nanosheet with $Bi_2Se_3$ and $TiO_2$ nanocrystals. For visible light photocatalysis of Rh.B, a significant enhancement in the reaction rate was consequently observed with $Bi_2Se_3-GR/TiO_2$ composites. The degradation rate($k_{app}$) obtained for sonophotocatalysis was $6.8{times}10^{-3}min^{-1}$, roughly 2.2 times better than that of VL photocatalysis under higher concentrations of Rh.B. The sonophotocatalysis was faster due to greater formation of reactive radicals as well as an increase of the active surface area of the $Bi_2Se_3-GR/TiO_2$ composites. The high activity is attributed to the synergetic effects of high charge mobility and red shift of the absorption edge of $Bi_2Se_3-GR/TiO_2$.
Key words: Microwave-assisted synthesis, Visible light, Sonophotocatalysis, Graphene hybrid, $Bi_2Se_3$
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