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http://dx.doi.org/10.14478/ace.2017.1046

New Synthesis of the Ternary Type Bi2WO6-GO-TiO2 Nanocomposites by the Hydrothermal Method for the Improvement of the Photo-catalytic Effect  

Nguyen, Dinh Cung Tien (Department of Advanced Materials Science & Engineering, Hanseo University)
Cho, Kwang Youn (Korea Institutes of Ceramic Engineering and Technology)
Oh, Won-Chun (Department of Advanced Materials Science & Engineering, Hanseo University)
Publication Information
Applied Chemistry for Engineering / v.28, no.6, 2017 , pp. 705-713 More about this Journal
Abstract
A novel material, $Bi_2WO_6-GO-TiO_2$ composite, was successfully synthesized using a facile hydrothermal method. During the hydrothermal reaction, the loading of $Bi_2WO_6$ and $TiO_2$ nanoparticles onto graphene sheets was achieved. The obtained $Bi_2WO_{6-GO-TiO2}$ composite photo-catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, transmission electron microscopy (TEM), Raman spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy (UV-vis-DRS), and X-ray photoelectron spectroscopy (XPS). The $Bi_2WO_6$ nanoparticle showed an irregular dark-square block nanoplate shape, while $TiO_2$ nanoparticles covered the surface of the graphene sheets with a quantum dot size. The degradation of rhodamine B (RhB), methylene blue trihydrate (MB), and reactive black B (RBB) dyes in an aqueous solution with different initial amount of catalysts was observed by UV spectrophotometry after measuring the decrease in the concentration. As a result, the $Bi_2WO_6-GO-TiO_2$ composite showed good decolorization activity with MB solution under visible light. The $Bi_2WO_6-GO-TiO_2$ composite is expected to become a new potential material for decolorization activity. Photocatalytic reactions with different photocatalysts were explained by the Langmuir-Hinshelwood model and a band theory.
Keywords
graphene nanocomposites; hydrothermal; decolorization; quantum dots; $Bi_2WO_6$; porous $TiO_2$;
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