Sonochemical coupled synthesis of Cr-TiO2 supported on Fe3O4 structures and chemical simulation of the degradation mechanism of Malachite Green dye

Diego Manuel de Santiago Colín, L.A. Martínez-Chávez, Ángeles Cuán, Eduardo A. Elizalde-Peña, Josefina Alvarado Rivera, C. Guzmán, L. Escobar-Alarcón, K. Esquivel

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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.
Translated title of the contributionSíntesis sonoquímica acoplada de Cr-TiO2 soportado en estructuras de Fe3O4 y simulación química del mecanismo de degradación del tinte verde Malaquita
Original languageEnglish
Pages (from-to)250-261
Number of pages11
JournalJournal of Photochemistry and Photobiology A: Chemistry
StatePublished - Sep 2018

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