| Hydrothermal Synthesis, Characterization and Improved Activity of a Visible-Light-Driven ZnSe-Sensitized TiO2 Composite Photocatalyst |
| Lei Zhu, Mei-Mei Peng1, Kwang Youn Cho2, Shu Ye, Sourav Sarkar, Kefayat Ullah, Ze-Da Meng, Won-Chun Oh |
Department of Advanced Materials Science & Engineering, Hanseo University
1Chemical Engineering Department, Hanseo University
2Korea Institute of Ceramic Engineering and Technology |
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| ABSTRACT |
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In this study, ZnSe-$TiO_2$ composites were synthesized by a facile hydrothermal-assisted sol-gel process and characterized by nitrogen adsorption isotherms (77 K), X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis, transmission electron microscopy (TEM) and UV-vis diffuse reflectance spectrophotometry. The photocatalytic activity was investigated by decoloration methylene blue (MB), methyl orange (MO), and rhodamine B (Rh.B) in an aqueous solution under visible light irradiation. The results revealed that the photocatalytic activity of the ZnSe-$TiO_2$ photocatalyst was much higher than that of pure$TiO_2$. The ZnSe nanoparticles, which act as a photosensitizer, not only extend the spectral response of $TiO_2$ to the visible region but also reduce charge recombinations. |
| Key words:
$TiO_2$, ZnSe, UV-vis, Hydrothermal, Visible light photocatalytic |
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