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Visible light driven photocatalysis in chromate(VI)/TiO_2 systems : improving stability of the photocatalyst

Visible light driven photocatalysis in chromate(VI)/TiO_2 ...

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dc.contributor.author Kuncewicz, Joanna [SAP13903062] pl
dc.contributor.author Ząbek, Przemysław pl
dc.contributor.author Stasicka, Zofia pl
dc.contributor.author Macyk, Wojciech [SAP11116781] pl
dc.contributor.author Stochel, Grażyna [SAP11011061] pl
dc.date.accessioned 2015-09-14T12:52:47Z
dc.date.available 2015-09-14T12:52:47Z
dc.date.issued 2011 pl
dc.identifier.issn 0920-5861 pl
dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/15625
dc.language eng pl
dc.title Visible light driven photocatalysis in chromate(VI)/TiO_2 systems : improving stability of the photocatalyst pl
dc.type JournalArticle pl
dc.description.physical 78-83 pl
dc.abstract.en Titanium dioxide photosensitization to visible light can be observed in the presence of chromate(VI) ions adsorbed at the surface of TiO 2 . The resulting materials do not show, however, sufficient stability and photostability—chromium(VI) species desorb from the surface and can be reduced to chromium(III). The stability of such systems has been improved by TiO 2 impregnation with fluorochromate(VI), K[CrO 3 F], instead of K 2 Cr 2 O 7 , yielding yellow F-Cr VI @TiO 2 material. Fluorides playing the role of anchors enable stronger adsorption of chromates at titanium dioxide. Also composites of water insoluble chromates(VI) with TiO 2 release significantly lower amounts of Cr VI ions. Such materials have been synthesized accord- ing to two main strategies—the first one involves precipitation of water insoluble chromates in the presence of TiO 2 particles (MCrO 4 @TiO 2 ) while the second strategy comprises of TiO 2 synthesis in the presence of insoluble chromate particles (TiO 2 @MCrO 4 ). Visible light induced photocatalytic activity of synthesized materials was studied in the process of 4-chlorophenol (4-CP) oxidation. A considerable pho- tocatalytic activity was observed in the case of F-Cr VI @TiO 2 and TiO 2 @MCrO 4 type materials (M n + :Ba 2+ , Co 2+ ,Mn 2+ ,Cr 3+ ). Among the composites the highest photoreactivity was shown by TiO 2 @CoCrO 4 (1.7% Cr VI , mol/mol, calcined at 450 ◦ C) and TiO 2 @Cr 2 (CrO 4 ) 3 (5% Cr VI , mol/mol, calcined at 450 ◦ C). pl
dc.description.volume 161 pl
dc.description.number 1 pl
dc.description.points 40 pl
dc.identifier.doi 10.1016/j.cattod.2010.10.075 pl
dc.identifier.eissn 1873-4308 pl
dc.title.journal Catalysis Today pl
dc.title.volume Selected contributions of the 6th European Meeting on Solar Chemistry and Photocatalysis : Environmental Applications (SPEA 6), 13th to 16th June 2010 pl
dc.language.container eng pl
dc.affiliation Wydział Chemii : Zakład Chemii Nieorganicznej pl
dc.subtype Article pl
.pointsMNiSW [2011 A]: 40


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