Browsing by Author "Loukanov A."

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    Combustion gel method for synthesis of nanosized ZnO/TiO2 powders
    (2013-05-21) Gegova R.; Dimitriev Y.; Bachvarova-Nedelcheva A.; Iordanova R.; Loukanov A.; Iliev T.
    Nanosized powders in the ZnO-TiO2 system were synthesized by combustion gel method using different precursors: Zn(NO3)2.6H2O, Ti(OC2H5)4 and Ti(OC4H9)4. During the combustion process only one phase, ZnO was obtained. The phase formation and structural transformation at every step of routes for the synthesis were followed by XRD and IR analysis. Our previous investigation in the same system, applying the hydrolytic sol-gel method showed that the type of precursor and the order of adding the components influenced on the microstructure of the final product in the ZnO-TiO2 system, which was proved also in this study. The obtained powders possess photocatalytical activity against organic dye (Malachite green) in the UV and Vis region.
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    Photocatalytic properties of ZnO/TiO2 powders obtained via combustion gel method
    (2013-03-01) Bachvarova-Nedelcheva A.; Iordanova R.; Stoyanova A.; Gegova R.; Dimitriev Y.; Loukanov A.
    The present study is a continuation of our previous investigations on the ZnO-TiO2 system. By applying different sol-gel methods we proved that the type of precursor and the order of adding the components influence the microstructure of the final product. This study focuses on the combustion sol-gel synthesis and photocatalytic properties of nanosized (∼7-20 nm) ZnO-TiO2 powders. The photocatalytic tests were performed toward two model organic dyes, Malachite Green and Reactive Black 5, in the UV and Vis region. For synthesis of ZnO/TiO2 powders, different precursors such as Zn(NO3)2·6H2O, Zn(CH 3COO)2·2H2O, Ti(OC2H 5)4 and Ti(OC4H9)4 were used. During the combustion process various phases (ZnO, TiO2 - anatase and rutile, ZnTiO3) were obtained. The structure and morphology of the resulting particles were characterized by XRD and SEM analysis. All samples exhibited a good photocatalytic activity in both UV and Vis regions. © 2012 Versita Warsaw and Springer-Verlag Wien.
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    Photocatalytic properties of ZnO/TiO2 powders obtained via combustion gel method
    (2013-03-01) Bachvarova-Nedelcheva A.; Iordanova R.; Stoyanova A.; Gegova R.; Dimitriev Y.; Loukanov A.
    The present study is a continuation of our previous investigations on the ZnO-TiO2 system. By applying different sol-gel methods we proved that the type of precursor and the order of adding the components influence the microstructure of the final product. This study focuses on the combustion sol-gel synthesis and photocatalytic properties of nanosized (∼7-20 nm) ZnO-TiO2 powders. The photocatalytic tests were performed toward two model organic dyes, Malachite Green and Reactive Black 5, in the UV and Vis region. For synthesis of ZnO/TiO2 powders, different precursors such as Zn(NO3)2·6H2O, Zn(CH 3COO)2·2H2O, Ti(OC2H 5)4 and Ti(OC4H9)4 were used. During the combustion process various phases (ZnO, TiO2 - anatase and rutile, ZnTiO3) were obtained. The structure and morphology of the resulting particles were characterized by XRD and SEM analysis. All samples exhibited a good photocatalytic activity in both UV and Vis regions. © 2012 Versita Warsaw and Springer-Verlag Wien.