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http://dx.doi.org/10.5012/bkcs.2012.33.11.3761

Ag2Se-Graphene/TiO2 Nanocomposites, Sonochemical Synthesis and Enhanced Photocatalytic Properties Under Visible Light  

Meng, Ze-Da (Department of Advanced Materials Science & Engineering, Hanseo University)
Zhu, Lei (Department of Advanced Materials Science & Engineering, Hanseo University)
Ghosh, Trisha (Department of Advanced Materials Science & Engineering, Hanseo University)
Park, Chong-Yeon (Department of Advanced Materials Science & Engineering, Hanseo University)
Ullah, Kefayat (Department of Advanced Materials Science & Engineering, Hanseo University)
Nikam, Vikram (Department of Advanced Materials Science & Engineering, Hanseo University)
Oh, Won-Chun (Department of Advanced Materials Science & Engineering, Hanseo University)
Publication Information
Bulletin of the Korean Chemical Society / v.33, no.11, 2012 , pp. 3761-3766 More about this Journal
Abstract
$Ag_2Se$-Graphene/$TiO_2$ composite was synthesized by a facile sonochemical method. The as-prepared products were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis, transmission electron microscopy (TEM) and UV-vis diffuse reflectance spectrophotometer. During the reaction, both of the reduction of graphene oxide and loading of $Ag_2Se$ and $TiO_2$ particles were achieved. The as-prepared $Ag_2Se$-Graphene/$TiO_2$ composites possessed great adsorptivity of dyes, extended light absorption range, and efficient charge separation properties simultaneously. Hence, in the photodegradation of rhodamine B (Rh.B), a significant enhancement in the reaction rate was observed with $Ag_2Se$-Graphene/$TiO_2$ composites, compared to the pure $TiO_2$. The high activity can be attributed to the synergetic effects of high charge mobility, and red shift in absorption edge of $Ag_2Se$-Graphene/$TiO_2$ composites.
Keywords
$Ag_2Se$; Graphene; UV-vis absorption spectra; Visible light; Rhodamine B;
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