Nb 2 O 5 supported in mixed oxides catalyzed mineralization process of methylene blue.

Autor: de Carvalho GSG; Federal University of Juiz de Fora, Chemistry Department, Cidade Universitária, Rua José Lourenço Kelmer s/n, Juiz de Fora, MG, 36036-900, Brazil., de Siqueira MM; Federal University of Juiz de Fora, Chemistry Department, Cidade Universitária, Rua José Lourenço Kelmer s/n, Juiz de Fora, MG, 36036-900, Brazil., do Nascimento MP; Federal University of Juiz de Fora, Chemistry Department, Cidade Universitária, Rua José Lourenço Kelmer s/n, Juiz de Fora, MG, 36036-900, Brazil., de Oliveira MAL; Federal University of Juiz de Fora, Chemistry Department, Cidade Universitária, Rua José Lourenço Kelmer s/n, Juiz de Fora, MG, 36036-900, Brazil., Amarante GW; Federal University of Juiz de Fora, Chemistry Department, Cidade Universitária, Rua José Lourenço Kelmer s/n, Juiz de Fora, MG, 36036-900, Brazil.
Jazyk: angličtina
Zdroj: Heliyon [Heliyon] 2020 Jun 05; Vol. 6 (6), pp. e04128. Date of Electronic Publication: 2020 Jun 05 (Print Publication: 2020).
DOI: 10.1016/j.heliyon.2020.e04128
Abstrakt: Heterogeneous photocatalysis has become a significant green technology for water treatment. The application of Nb 2 O 5 catalyst for the photodegradation of contaminants has merged as an important tool to this process. Furthermore, it is known that catalytic phases supported on metal oxides are an alternative method for enhancing its activity. In this work, supported Nb 2 O 5 on mixed oxides as catalyst was applied to degrade methylene blue dye, leading to almost 100% of dye degradation without the need of any additives, after only three hours of sunlight exposure. The effect of catalyst concentration, exposure time and light source were investigated. The best catalyst activity was found at 1.5 g L -1 and for higher catalyst concentrations the degradation was kept constant. Plausible intermediates of this degradation process were observed and characterized by NMR, LC/MS and CZE techniques. After degradation, the catalyst was recovered and could be further re-applied in other three reaction cycles without significant loss of catalytic activity.
(© 2020 Published by Elsevier Ltd.)
Databáze: MEDLINE
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