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Nitrogen-Doped Graphene Iron-Based Particle Electrode Outperforms Activated Carbon in Three-Dimensional Electrochemical Water Treatment Systems

1
Department of Chemical Engineering, Amirkabir University of Technology, 15875-4413 Tehran, Iran
2
Section of Chemical Engineering, Department of Chemistry and Bioscience, Aalborg University, 6700 Esbjerg, Denmark
*
Authors to whom correspondence should be addressed.
Water 2020, 12(11), 3121; https://doi.org/10.3390/w12113121
Received: 7 October 2020 / Revised: 1 November 2020 / Accepted: 4 November 2020 / Published: 7 November 2020
(This article belongs to the Section Wastewater Treatment and Reuse)
The synergy between electrochemical oxidation and adsorption on particle electrodes was investigated in three-dimensional (3D) systems for p-nitrosodimethylaniline (RNO) decolorization and pesticide removal. A comparison was made between granular activated carbon (GAC) and a novel synthesized nitrogen-doped graphene-based particle electrode (NCPE). Experiments on RNO decolorization show that the synergy parameter of the 3D-NCPE system was improved 3000 times compared to the studied 3D-GAC system. This was due to the specific nanostructure and composition of the NCPE material. Nitrogen-doped graphene triggered an oxygen reduction reaction, producing hydrogen peroxide that simultaneously catalyzed on iron sites of the NCPEs to hydroxyl radicals following the electro-Fenton (EF) process. Data showed that in the experimental setup used for the study, the applied cell voltage required for the optimal value of the synergy parameter could be lowered to 5V in the 3D-NCPEs process, which is significantly better than the 15–20 V needed for synergy to be found in the 3D-GAC process. Compared to previous studies with 3D-GAC, the removal of pesticides 2,6 dichlorobenzamide (BAM), 2-methyl-4-chlorophenoxyaceticacid (MCPA), and methylchlorophenoxypropionic acid (MCPP) was also enhanced in the 3D-NCPE system. View Full-Text
Keywords: three-dimensional electrochemical water treatment; synergy parameter; nitrogen-doped graphene; activated carbon; pesticide removal three-dimensional electrochemical water treatment; synergy parameter; nitrogen-doped graphene; activated carbon; pesticide removal
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MDPI and ACS Style

Ghanbarlou, H.; Pedersen, N.L.; Simonsen, M.E.; Muff, J. Nitrogen-Doped Graphene Iron-Based Particle Electrode Outperforms Activated Carbon in Three-Dimensional Electrochemical Water Treatment Systems. Water 2020, 12, 3121. https://doi.org/10.3390/w12113121

AMA Style

Ghanbarlou H, Pedersen NL, Simonsen ME, Muff J. Nitrogen-Doped Graphene Iron-Based Particle Electrode Outperforms Activated Carbon in Three-Dimensional Electrochemical Water Treatment Systems. Water. 2020; 12(11):3121. https://doi.org/10.3390/w12113121

Chicago/Turabian Style

Ghanbarlou, Hosna; Pedersen, Nikoline L.; Simonsen, Morten E.; Muff, Jens. 2020. "Nitrogen-Doped Graphene Iron-Based Particle Electrode Outperforms Activated Carbon in Three-Dimensional Electrochemical Water Treatment Systems" Water 12, no. 11: 3121. https://doi.org/10.3390/w12113121

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