Preparation and characterization of Zno/CuO semiconductor and photocatalytic activity on the decolorization of direct red 80 azodye
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Data
2015-12-01
Autores
Da Silva, Wallace J.C.
Da Silva, Marcelo R. [UNESP]
Takashima, Keiko
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Resumo
Zinc oxide, an n-type semiconductor, has been used as photocatalyst for contaminated water purification by organic compounds. The addition of a p-type semiconductor as copper oxide could increase the catalytic efficiency through the p-n junction in order to decrease the electron-hole recombination. In this work, zinc and copper oxides containing 1.0, 3.0, and 5.0 % of copper were prepared by manual grinding, followed by heat treatment at 300C during 5 h. The zinc oxide and copper oxide mixture as well as their precursors were characterized by x-ray diffraction, diffuse reflectance, scanning electron microscopy, and x-ray fluorescence. The photocatalytic efficiency was verified by the direct red 80 tetraazodye decolorization using UV radiation under pseudo-first order conditions at natural pH (7.5-8.0) and 30 °C. The highest photocatalytic activity occurred to the semiconductor containing 1.0 % copper oxide, whose decolorization rate constant was equivalent to 6.40×10-2min-1, that is, 17.4 % larger in comparison to ZnO, 5.45×10-2min-1.
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Characterization, Copper oxide, Direct red 80, Heterogeneous photocatalysis, Zinc oxide
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Journal of the Chilean Chemical Society, v. 60, n. 4, p. 2749-2751, 2015.