PREPARATION AND CHARACTERIZATION OF ZnO/CuO SEMICONDUCTOR AND PHOTOCATALYTIC ACTIVITY ON THE DECOLORIZATION OF DIRECT RED 80 AZODYE

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dc.contributor.authorDa Silva, Wallace J. C.
dc.contributor.authorDa Silva, Marcelo R. [UNESP]
dc.contributor.authorTakashima, Keiko
dc.contributor.institutionUniversidade Estadual de Londrina (UEL)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2018-11-26T15:29:13Z
dc.date.available2018-11-26T15:29:13Z
dc.date.issued2015-12-01
dc.description.abstractZinc 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 300 degrees C 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 degrees C. The highest photocatalytic activity occurred to the semiconductor containing 1.0 % copper oxide, whose decolorization rate constant was equivalent to 6.40x10(-2) min(-1), that is, 17.4 % larger in comparison to ZnO, 5.45x10(-2) min(-1).en
dc.description.affiliationUniv Estadual Londrina, Lab Proc Oxidacao Avancados, Dept Quim, Caixa Postal 10011, BR-86057970 Londrina, Parana, Brazil
dc.description.affiliationUniv Estadual Paulista, Colegio Tecn Ind, Fac Engn, BR-17033260 Sao Paulo, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Colegio Tecn Ind, Fac Engn, BR-17033260 Sao Paulo, Brazil
dc.description.sponsorshipFundacao Araucaria
dc.description.sponsorshipIdFundacao Araucaria: 22850/2011
dc.format.extent2749-2751
dc.identifier.citationJournal Of The Chilean Chemical Society. Concepcion: Soc Chilena Quimica, v. 60, n. 4, p. 2749-2751, 2015.
dc.identifier.issn0717-9707
dc.identifier.urihttp://hdl.handle.net/11449/158792
dc.identifier.wosWOS:000373368100022
dc.language.isoeng
dc.publisherSoc Chilena Quimica
dc.relation.ispartofJournal Of The Chilean Chemical Society
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectheterogeneous photocatalysis
dc.subjectzinc oxide
dc.subjectcopper oxide
dc.subjectcharacterization
dc.subjectdirect red 80
dc.titlePREPARATION AND CHARACTERIZATION OF ZnO/CuO SEMICONDUCTOR AND PHOTOCATALYTIC ACTIVITY ON THE DECOLORIZATION OF DIRECT RED 80 AZODYEen
dc.typeArtigo
dcterms.rightsHolderSoc Chilena Quimica

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