Sonochemical coupled synthesis of Cr-TiO^sub 2^ supported on Fe^sub 3^O^sub 4^ structures and chemical simulation of the degradation mechanism of Malachite Green dye

Cr-TiO2 supported on Fe3O4 material was synthesized using a sonochemical method. By TEM images it was possible to observe cubic morphologies and by XRD and Raman spectroscopy the anatase phase was evaluated, showing that no subsequent thermal treatment was necessary. XPS analysis shows a decrease in...

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Published in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 2018-09, Vol.364, p.250
Main Authors: Colín, Diego Manuel de Santiago, Martínez-Chávez, LA, Cuán, Ángeles, Elizalde-Peña, Eduardo A, Rivera, Josefina Alvarado, Guzmán, C, Escobar-Alarcón, L, Esquivel, K
Format: Article
Language:English
Subjects:
Anatase
Benzophenone
Bubbling
Byproducts
Catalysts
Chemical compounds
Color removal
Computer simulation
Density functional theory
Dyes
Heat treatment
Iron oxides
Leuco dyes
Malachite green
Medical imaging
Morphology
Organic chemistry
Photocatalysis
Raman spectroscopy
Reaction time
Solar radiation
Time dependence
Titanium dioxide
Water treatment
X ray photoelectron spectroscopy
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Summary:Cr-TiO2 supported on Fe3O4 material was synthesized using a sonochemical method. By TEM images it was possible to observe cubic morphologies and by XRD and Raman spectroscopy the anatase phase was evaluated, showing that no subsequent thermal treatment was necessary. XPS analysis shows a decrease in the intensity of the Fe3O4 signals when the TiO2 is added to create the material discussed in this paper. Also, by this technique, it was possible to confirm the presence of Cr over the doped materials. In the photocatalysis test. 100% of color removal of the Malachite Green dye (10 mg L−1) was achieved after 300 min of reaction time under solar radiation in a cylindrical reactor with constant bubbling, and only 60% of TOC removal was reached. Using the Time Dependent – Density Functional Theory (TD-DFT) model, was possible to predict the by-products of the photocatalytic reaction of the Malachite Green dye, such as the leuco carbinol Malachite Green, 4-(dimethylamino) benzophenone and 4-[[4-(dimethylamino) phenyl] methyl]-N,N-dimethylaniline Malachite and it its compared with the experimental UV–vis spectra.
ISSN:1010-6030
1873-2666