Synergistic bromothymol blue dye degradation with hydrodynamic cavitation and hydrogen peroxide (HC-H2O2)

Machado, Polyane Ribeiro; Soeira, Thiago Vinicius Ribeiro; Pagan, Fausto de Souza; Malpass, Geoffroy Roger Pointer; Gonçalves, Julio Cesar de Souza Inácio; Ferreira, Deusmaque Carneiro

doi:10.4136/ambi-agua.2518

Cited by 4 publications

(1 citation statement)

References 25 publications

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“…Advanced oxidative processes (AOPs) have attracted attention as highly competitive alternatives for the removal of dyes and other recalcitrant compounds (Nguyen et al 2017;Alves et al 2019;Araújo et al 2020;Machado et al 2020;Poblete et al 2020;Tripathy et al 2020;Raji et al 2021). Ozone processes are AOPs of particular interest because they demonstrate ease of installation and operation, aptitude to remove turbidity, low influence on subsequent processes in the treatment plant and are able to synergize with other agents (other oxidants, catalysts and/or radiation) (Nawrocki 2013;Takashina et al 2017;Setareh et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Study of the catalytic activity of multilayer graphene (MLG), molybdenum oxide (MoO2), and manganese ferrite (MnFe2O4) on the melanoidin removal by ozonation process

Mateus

Luz

Gelamo

et al. 2021

Braz. J. Chem. Eng.

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Melanoidin is a compound produced by food industries and distilleries, which has negative impacts on the water environment due to the high content of dissolved organic carbon and dark color. Consequently, this work aims to study the catalytic properties of multilayer graphene (MLG), molybdenum oxide (MoO 2 ), and manganese ferrite (MnFe 2 O 4 ) in the ozonation process to remove melanoidin from water solution. The results show that the reaction rate constant (k) of the melanoidin decolorization process using catalytic ozonation is 1.7 times higher than the non-catalytic ozonation process. The same results were observed for all catalytic materials with no significant difference among them. On the other hand, MLG was the most efficient catalyst in removing total organic carbon. The removal efficiency was 32% for the non-catalytic ozonation process and 63% for the catalytic ozonation using MLG. This increase in efficiency is attributed to a better production of hydroxyl radicals in the presence of MLG, which was confirmed using isopropanol as a radical scavenger. The efficiencies using MoO 2 and MnFe 2 O 4 were 46% and 51%, respectively. The results show that catalytic ozonation by MLG is a promising treatment for melanoidin removal.

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