Synergy of combined adsorption and electrochemical degradation of aqueous organics by granular activated carbon particulate electrodes

Nikoline Loklindt Pedersen, Mahdi Nikbakht Fini, Peter Krisztian Molnar, Jens Muff

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Electrochemical oxidation (EO) and activated carbon (AC) adsorption are, despite difference in maturation andmarket dissemination, both well-proven water treatment principles for the abatement of micropollutants. Bothtechnologies suffer some drawbacks as mass transfer limitations (in case of EO) and poor adsorption affinity ofsome compounds (in case of AC). Granular active carbon may, when placed within an electric field, be polarizedgenerating particulate reactive microelectrodes in bulk solution increasing the overall active electrode area, aconcept known as 3D electrochemistry. In this paper, a potential synergy by combining EO and AC was studiedin a potentiostatic batch setup at different applied electric field strengths (25–500 V/m), using boron-dopeddiamond (BDD) as active anode and the hydroxyl radical probe compound p-nitrosodimethylaniline (RNO) andthe groundwater contaminants 2-methyl-4-chlorophenoxy acetic acid (MCPA), 2-methyl-4-chlorophenoxy pro-pionic acid (MCPP or mecoprop) and 2,6-benzamide (BAM) as target model contaminants. Synergy was assessedbased on comparison of the 3D process with removal kinetics in conventional 2D electrochemical process andpure AC adsorption. In demineralized water model solutions, synergies of 121–126% was found for RNO, MCPAand MCPA at 375 V/m electric field strength and w/w AC:organic ratio of 5:1. For BAM, the synergy was 192%,primarily due to stronger AC adsorption affinity. The study showed interesting perspectives of this treatmentconcept that needs to be pursued and studied in matrices of higher complexity.
OriginalsprogEngelsk
TidsskriftSeparation and Purification Technology
Vol/bind208
Sider (fra-til)51-58
Antal sider8
ISSN1383-5866
DOI
StatusUdgivet - 9 jan. 2019

Fingerprint

Activated carbon
Adsorption
Degradation
Electrodes
Electrochemical oxidation
Acetic acid
Impurities
Boron
Microelectrodes
Electrochemistry
Water treatment
Hydroxyl Radical
Groundwater
Anodes
Carbon
Mass transfer
Kinetics
Acids
Water
4-chlorophenoxyacetic acid

Citer dette

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title = "Synergy of combined adsorption and electrochemical degradation of aqueous organics by granular activated carbon particulate electrodes",
abstract = "Electrochemical oxidation (EO) and activated carbon (AC) adsorption are, despite difference in maturation andmarket dissemination, both well-proven water treatment principles for the abatement of micropollutants. Bothtechnologies suffer some drawbacks as mass transfer limitations (in case of EO) and poor adsorption affinity ofsome compounds (in case of AC). Granular active carbon may, when placed within an electric field, be polarizedgenerating particulate reactive microelectrodes in bulk solution increasing the overall active electrode area, aconcept known as 3D electrochemistry. In this paper, a potential synergy by combining EO and AC was studiedin a potentiostatic batch setup at different applied electric field strengths (25–500 V/m), using boron-dopeddiamond (BDD) as active anode and the hydroxyl radical probe compound p-nitrosodimethylaniline (RNO) andthe groundwater contaminants 2-methyl-4-chlorophenoxy acetic acid (MCPA), 2-methyl-4-chlorophenoxy pro-pionic acid (MCPP or mecoprop) and 2,6-benzamide (BAM) as target model contaminants. Synergy was assessedbased on comparison of the 3D process with removal kinetics in conventional 2D electrochemical process andpure AC adsorption. In demineralized water model solutions, synergies of 121–126{\%} was found for RNO, MCPAand MCPA at 375 V/m electric field strength and w/w AC:organic ratio of 5:1. For BAM, the synergy was 192{\%},primarily due to stronger AC adsorption affinity. The study showed interesting perspectives of this treatmentconcept that needs to be pursued and studied in matrices of higher complexity.",
author = "Pedersen, {Nikoline Loklindt} and {Nikbakht Fini}, Mahdi and Molnar, {Peter Krisztian} and Jens Muff",
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Synergy of combined adsorption and electrochemical degradation of aqueous organics by granular activated carbon particulate electrodes. / Pedersen, Nikoline Loklindt; Nikbakht Fini, Mahdi ; Molnar, Peter Krisztian; Muff, Jens.

I: Separation and Purification Technology, Bind 208, 09.01.2019, s. 51-58.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Synergy of combined adsorption and electrochemical degradation of aqueous organics by granular activated carbon particulate electrodes

AU - Pedersen, Nikoline Loklindt

AU - Nikbakht Fini, Mahdi

AU - Molnar, Peter Krisztian

AU - Muff, Jens

PY - 2019/1/9

Y1 - 2019/1/9

N2 - Electrochemical oxidation (EO) and activated carbon (AC) adsorption are, despite difference in maturation andmarket dissemination, both well-proven water treatment principles for the abatement of micropollutants. Bothtechnologies suffer some drawbacks as mass transfer limitations (in case of EO) and poor adsorption affinity ofsome compounds (in case of AC). Granular active carbon may, when placed within an electric field, be polarizedgenerating particulate reactive microelectrodes in bulk solution increasing the overall active electrode area, aconcept known as 3D electrochemistry. In this paper, a potential synergy by combining EO and AC was studiedin a potentiostatic batch setup at different applied electric field strengths (25–500 V/m), using boron-dopeddiamond (BDD) as active anode and the hydroxyl radical probe compound p-nitrosodimethylaniline (RNO) andthe groundwater contaminants 2-methyl-4-chlorophenoxy acetic acid (MCPA), 2-methyl-4-chlorophenoxy pro-pionic acid (MCPP or mecoprop) and 2,6-benzamide (BAM) as target model contaminants. Synergy was assessedbased on comparison of the 3D process with removal kinetics in conventional 2D electrochemical process andpure AC adsorption. In demineralized water model solutions, synergies of 121–126% was found for RNO, MCPAand MCPA at 375 V/m electric field strength and w/w AC:organic ratio of 5:1. For BAM, the synergy was 192%,primarily due to stronger AC adsorption affinity. The study showed interesting perspectives of this treatmentconcept that needs to be pursued and studied in matrices of higher complexity.

AB - Electrochemical oxidation (EO) and activated carbon (AC) adsorption are, despite difference in maturation andmarket dissemination, both well-proven water treatment principles for the abatement of micropollutants. Bothtechnologies suffer some drawbacks as mass transfer limitations (in case of EO) and poor adsorption affinity ofsome compounds (in case of AC). Granular active carbon may, when placed within an electric field, be polarizedgenerating particulate reactive microelectrodes in bulk solution increasing the overall active electrode area, aconcept known as 3D electrochemistry. In this paper, a potential synergy by combining EO and AC was studiedin a potentiostatic batch setup at different applied electric field strengths (25–500 V/m), using boron-dopeddiamond (BDD) as active anode and the hydroxyl radical probe compound p-nitrosodimethylaniline (RNO) andthe groundwater contaminants 2-methyl-4-chlorophenoxy acetic acid (MCPA), 2-methyl-4-chlorophenoxy pro-pionic acid (MCPP or mecoprop) and 2,6-benzamide (BAM) as target model contaminants. Synergy was assessedbased on comparison of the 3D process with removal kinetics in conventional 2D electrochemical process andpure AC adsorption. In demineralized water model solutions, synergies of 121–126% was found for RNO, MCPAand MCPA at 375 V/m electric field strength and w/w AC:organic ratio of 5:1. For BAM, the synergy was 192%,primarily due to stronger AC adsorption affinity. The study showed interesting perspectives of this treatmentconcept that needs to be pursued and studied in matrices of higher complexity.

U2 - 10.1016/j.seppur.2018.05.023

DO - 10.1016/j.seppur.2018.05.023

M3 - Journal article

VL - 208

SP - 51

EP - 58

JO - Separation and Purification Technology

JF - Separation and Purification Technology

SN - 1383-5866

ER -