Methylene blue decolorization and mineralization by means of electrochemical technology at pre-pilot plant scale

Role of the electrode material and oxidants

Juliana Patrícia Souza Duarte Pontes, Patrícia Rachel Fernandes da Costa, Djalma Ribeiro da Silva, Sergio GARCIA SEGURA, Carlos Alberto Martínez-Huitle

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In this work, a synthetic effluent containing methylene blue has been treated by electrochemical oxidation (EO) process at pre-pilot plant scale using a filter-press electrochemical cell reactor. Electrochemical experiments were carried out using Ti/Pt and Ti/IrO2-Ta2O5 anodic materials in the presence or absence of chloride ions to study the influence on the decolorization and mineralization of the different oxidant species electrogenerated in situ. The electrochemical experiences have been carried out at different applied current densities (j = 20, 40 and 60 mA cm-2) to evaluate the effect of this controlling parameter on the degradation efficiency and the operational energy consumption. Under optimal treatment conditions of 40 mA cm-2 in 0.05 M of Na2SO4 at pH 6.0, solutions of 100 mg L-1 of methylene blue were completely decolorized obtaining 86.0 % of COD abatement after 360 min of electrolysis. The determination of energy consumption allowed to estimate operational costs about 13.36 US$ m-3. The results obtained provide valuable information regarding the EO process scaling-up, aiming the application of electrochemical technologies to treat actual effluent at real scale.

Original languageEnglish (US)
Pages (from-to)4878-4891
Number of pages14
JournalInternational Journal of Electrochemical Science
Volume11
Issue number6
DOIs
StatePublished - Jun 1 2016
Externally publishedYes

Fingerprint

Electrochemical oxidation
Methylene Blue
Pilot plants
Oxidants
Effluents
Energy utilization
Electrodes
Electrochemical cells
Electrolysis
Chlorides
Current density
Ions
Degradation
Costs
Experiments

Keywords

  • Anodic oxidation
  • Dimensional stable anodes (DSA)
  • Dyes
  • Electrochemical advanced oxidation processes (EAOPs)
  • Wastewater treatment

ASJC Scopus subject areas

  • Electrochemistry

Cite this

Methylene blue decolorization and mineralization by means of electrochemical technology at pre-pilot plant scale : Role of the electrode material and oxidants. / Pontes, Juliana Patrícia Souza Duarte; da Costa, Patrícia Rachel Fernandes; da Silva, Djalma Ribeiro; GARCIA SEGURA, Sergio; Martínez-Huitle, Carlos Alberto.

In: International Journal of Electrochemical Science, Vol. 11, No. 6, 01.06.2016, p. 4878-4891.

Research output: Contribution to journalArticle

Pontes, Juliana Patrícia Souza Duarte ; da Costa, Patrícia Rachel Fernandes ; da Silva, Djalma Ribeiro ; GARCIA SEGURA, Sergio ; Martínez-Huitle, Carlos Alberto. / Methylene blue decolorization and mineralization by means of electrochemical technology at pre-pilot plant scale : Role of the electrode material and oxidants. In: International Journal of Electrochemical Science. 2016 ; Vol. 11, No. 6. pp. 4878-4891.
@article{3d96dd6afb3947ceabec34801ea7bd5d,
title = "Methylene blue decolorization and mineralization by means of electrochemical technology at pre-pilot plant scale: Role of the electrode material and oxidants",
abstract = "In this work, a synthetic effluent containing methylene blue has been treated by electrochemical oxidation (EO) process at pre-pilot plant scale using a filter-press electrochemical cell reactor. Electrochemical experiments were carried out using Ti/Pt and Ti/IrO2-Ta2O5 anodic materials in the presence or absence of chloride ions to study the influence on the decolorization and mineralization of the different oxidant species electrogenerated in situ. The electrochemical experiences have been carried out at different applied current densities (j = 20, 40 and 60 mA cm-2) to evaluate the effect of this controlling parameter on the degradation efficiency and the operational energy consumption. Under optimal treatment conditions of 40 mA cm-2 in 0.05 M of Na2SO4 at pH 6.0, solutions of 100 mg L-1 of methylene blue were completely decolorized obtaining 86.0 {\%} of COD abatement after 360 min of electrolysis. The determination of energy consumption allowed to estimate operational costs about 13.36 US$ m-3. The results obtained provide valuable information regarding the EO process scaling-up, aiming the application of electrochemical technologies to treat actual effluent at real scale.",
keywords = "Anodic oxidation, Dimensional stable anodes (DSA), Dyes, Electrochemical advanced oxidation processes (EAOPs), Wastewater treatment",
author = "Pontes, {Juliana Patr{\'i}cia Souza Duarte} and {da Costa}, {Patr{\'i}cia Rachel Fernandes} and {da Silva}, {Djalma Ribeiro} and {GARCIA SEGURA}, Sergio and Mart{\'i}nez-Huitle, {Carlos Alberto}",
year = "2016",
month = "6",
day = "1",
doi = "10.20964/2016.06.2",
language = "English (US)",
volume = "11",
pages = "4878--4891",
journal = "International Journal of Electrochemical Science",
issn = "1452-3981",
publisher = "Electrochemical Science Group",
number = "6",

}

TY - JOUR

T1 - Methylene blue decolorization and mineralization by means of electrochemical technology at pre-pilot plant scale

T2 - Role of the electrode material and oxidants

AU - Pontes, Juliana Patrícia Souza Duarte

AU - da Costa, Patrícia Rachel Fernandes

AU - da Silva, Djalma Ribeiro

AU - GARCIA SEGURA, Sergio

AU - Martínez-Huitle, Carlos Alberto

PY - 2016/6/1

Y1 - 2016/6/1

N2 - In this work, a synthetic effluent containing methylene blue has been treated by electrochemical oxidation (EO) process at pre-pilot plant scale using a filter-press electrochemical cell reactor. Electrochemical experiments were carried out using Ti/Pt and Ti/IrO2-Ta2O5 anodic materials in the presence or absence of chloride ions to study the influence on the decolorization and mineralization of the different oxidant species electrogenerated in situ. The electrochemical experiences have been carried out at different applied current densities (j = 20, 40 and 60 mA cm-2) to evaluate the effect of this controlling parameter on the degradation efficiency and the operational energy consumption. Under optimal treatment conditions of 40 mA cm-2 in 0.05 M of Na2SO4 at pH 6.0, solutions of 100 mg L-1 of methylene blue were completely decolorized obtaining 86.0 % of COD abatement after 360 min of electrolysis. The determination of energy consumption allowed to estimate operational costs about 13.36 US$ m-3. The results obtained provide valuable information regarding the EO process scaling-up, aiming the application of electrochemical technologies to treat actual effluent at real scale.

AB - In this work, a synthetic effluent containing methylene blue has been treated by electrochemical oxidation (EO) process at pre-pilot plant scale using a filter-press electrochemical cell reactor. Electrochemical experiments were carried out using Ti/Pt and Ti/IrO2-Ta2O5 anodic materials in the presence or absence of chloride ions to study the influence on the decolorization and mineralization of the different oxidant species electrogenerated in situ. The electrochemical experiences have been carried out at different applied current densities (j = 20, 40 and 60 mA cm-2) to evaluate the effect of this controlling parameter on the degradation efficiency and the operational energy consumption. Under optimal treatment conditions of 40 mA cm-2 in 0.05 M of Na2SO4 at pH 6.0, solutions of 100 mg L-1 of methylene blue were completely decolorized obtaining 86.0 % of COD abatement after 360 min of electrolysis. The determination of energy consumption allowed to estimate operational costs about 13.36 US$ m-3. The results obtained provide valuable information regarding the EO process scaling-up, aiming the application of electrochemical technologies to treat actual effluent at real scale.

KW - Anodic oxidation

KW - Dimensional stable anodes (DSA)

KW - Dyes

KW - Electrochemical advanced oxidation processes (EAOPs)

KW - Wastewater treatment

UR - http://www.scopus.com/inward/record.url?scp=84974824103&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84974824103&partnerID=8YFLogxK

U2 - 10.20964/2016.06.2

DO - 10.20964/2016.06.2

M3 - Article

VL - 11

SP - 4878

EP - 4891

JO - International Journal of Electrochemical Science

JF - International Journal of Electrochemical Science

SN - 1452-3981

IS - 6

ER -