Simultaneous Electrochemical Generation of Ferrate and Oxygen Radicals to Blue BR Dye Degradation

Mauricio Chiliquinga; Patricio J. Espinoza-Montero; Oscar Rodríguez; Alain Picos; Erick R. Bandala; S. Gutiérrez-Granados; Juan M. Peralta-Hernández

LAPSE

Living Archive for Process Systems Engineering

LAPSE:2020.1020

Published Article

LAPSE:2020.1020

Simultaneous Electrochemical Generation of Ferrate and Oxygen Radicals to Blue BR Dye Degradation

Mauricio Chiliquinga, Patricio J. Espinoza-Montero, Oscar Rodríguez, Alain Picos, Erick R. Bandala, S. Gutiérrez-Granados, Juan M. Peralta-Hernández

October 6, 2020

In this study, electro-oxidation (EOx) and in situ generation of ferrate ions [Fe(VI)] were tested to treat water contaminated with Blue BR dye (BBR) using a boron-doped diamond (BDD) anode. Two electrolytic media (0.1 M HClO4 and 0.05 M Na2SO4) were evaluated for the BDD, which simultaneously produced oxygen radicals (•OH) and [Fe(VI)]. The generation of [Fe(VI)] was characterized by cyclic voltammetry (CV) and the effect of different current intensity values (e.g., 7 mA cm−2, 15 mA cm−2, and 30 mA cm−2) was assessed during BBR degradation tests. The discoloration of BBR was followed by UV-Vis spectrophotometry. When the EOx process was used alone, only 78% BBR discoloration was achieved. The best electrochemical discoloration conditions were found using 0.05 M Na2SO4 and 30 mA cm−2. Using these conditions, overall BBR discoloration values up to 98%, 95%, and 87% with 12 mM, 6 mM, and 1 mM of FeSO4, respectively, were achieved. In the case of chemical oxygen demand (COD) reduction, the EOx process showed only a 37% COD reduction, whereas combining [Fe(VI)] generation using 12 mM of FeSO4 achieved an up to 61% COD reduction after 90 min. The evolution of reaction byproducts (oxalic acid) was performed using liquid chromatography analysis.

Record ID

LAPSE:2020.1020

Keywords

advace oxitadion processes (AOP), BBR dye, electro-oxidation, ferrate ion

Subject

Reaction Engineering

Suggested Citation

Chiliquinga M, Espinoza-Montero PJ, Rodríguez O, Picos A, Bandala ER, Gutiérrez-Granados S, Peralta-Hernández JM. Simultaneous Electrochemical Generation of Ferrate and Oxygen Radicals to Blue BR Dye Degradation. (2020). LAPSE:2020.1020

Author Affiliations

Chiliquinga M: Departamento de Ingeniería Civil y Ambiental, Facultad de Ingeniería Civil y Ambiental, Escuela Politécnica Nacional. P.O. Box, Quito 17-01-2759, Ecuador; Departamento de Química, División de Ciencias Naturales y Exactas, Universidad de Guanajuato, C
Espinoza-Montero PJ: Escuela de Ciencias Químicas, Pontificia Universidad Católica del Ecuador, Avenida 12 de Octubre y Roca, Apartado, Quito 17-01-2184, Ecuador [ORCID]
Rodríguez O: Departamento de Química, División de Ciencias Naturales y Exactas, Universidad de Guanajuato, Cerro de la Venada s/n, Pueblito de Rocha, Guanajuato 36040, Mexico
Picos A: Departamento de Química, División de Ciencias Naturales y Exactas, Universidad de Guanajuato, Cerro de la Venada s/n, Pueblito de Rocha, Guanajuato 36040, Mexico
Bandala ER: Division of Hydrologic Sciences, Desert Research Institute, 755 E. Flamingo Road, Las Vegas, NV 89119-7363, USA [ORCID]
Gutiérrez-Granados S: Departamento de Química, División de Ciencias Naturales y Exactas, Universidad de Guanajuato, Cerro de la Venada s/n, Pueblito de Rocha, Guanajuato 36040, Mexico
Peralta-Hernández JM: Departamento de Química, División de Ciencias Naturales y Exactas, Universidad de Guanajuato, Cerro de la Venada s/n, Pueblito de Rocha, Guanajuato 36040, Mexico [ORCID]

Journal Name

Processes

Volume

8

Issue

7

Article Number

E753

Year

2020

Publication Date

2020-06-28