TY - JOUR
T1 - An efficient system for electro-Fenton oxidation of pesticide by a reduced graphene oxide-aminopyrazine@3DNi foam gas diffusion electrode
AU - Senthilnathan, Jaganathan
AU - Younis, Sherif A.
AU - Kwon, Eilhann E.
AU - Surenjan, Anupama
AU - Kim, Ki Hyun
AU - Yoshimura, Masahiro
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/12/5
Y1 - 2020/12/5
N2 - A stable rGO-AmPyraz@3DNiF gas diffusion electrode was prepared via modification of 3D nickel foam (3D-NiF) with aminopyrazine functionalized reduced graphene oxide (rGO-AmPyraz) for the electro Fenton (EF) process. The generation capacity of H2O2 and OH radicals by this electrode was assessed relative to 3DNiF and rGO-AmPyraz@indium tin oxide (ITO) electrodes and with/without a coated Fe3O4 plate. The rGO-AmPyraz@3DNiF electrode showed the maximum production of these radicals at 2.2 mmol h−1 and 410 μmol h−1, respectively (pH 3) with the least leaching of Ni2+ such as < 0.5 mg L−1 even after 5 cycles (e.g., relative to 3DNiF (24 mg L−1). Such control on Ni ion leaching was effective all across the tested pH from 3 to 8.5. Its H2O2 generation capacity was far higher than that of the nanocarbon supported on commercially available ITO conductive glass. The mineralization of dichlorvos (at initial concentration: 50 mg L−1) was confirmed with its complete degradation as the concentrations of the end products (e.g., free Cl−1 (5.36 mg L−1) and phosphate (12.89 mg L−1)) were in good agreement with their stoichiometric concentration in dichlorvos. As such, the proposed system can be recommended as an effective electrode to replace nanocarbon-based product commonly employed for EF processes.
AB - A stable rGO-AmPyraz@3DNiF gas diffusion electrode was prepared via modification of 3D nickel foam (3D-NiF) with aminopyrazine functionalized reduced graphene oxide (rGO-AmPyraz) for the electro Fenton (EF) process. The generation capacity of H2O2 and OH radicals by this electrode was assessed relative to 3DNiF and rGO-AmPyraz@indium tin oxide (ITO) electrodes and with/without a coated Fe3O4 plate. The rGO-AmPyraz@3DNiF electrode showed the maximum production of these radicals at 2.2 mmol h−1 and 410 μmol h−1, respectively (pH 3) with the least leaching of Ni2+ such as < 0.5 mg L−1 even after 5 cycles (e.g., relative to 3DNiF (24 mg L−1). Such control on Ni ion leaching was effective all across the tested pH from 3 to 8.5. Its H2O2 generation capacity was far higher than that of the nanocarbon supported on commercially available ITO conductive glass. The mineralization of dichlorvos (at initial concentration: 50 mg L−1) was confirmed with its complete degradation as the concentrations of the end products (e.g., free Cl−1 (5.36 mg L−1) and phosphate (12.89 mg L−1)) were in good agreement with their stoichiometric concentration in dichlorvos. As such, the proposed system can be recommended as an effective electrode to replace nanocarbon-based product commonly employed for EF processes.
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U2 - 10.1016/j.jhazmat.2020.123323
DO - 10.1016/j.jhazmat.2020.123323
M3 - Article
C2 - 32947720
AN - SCOPUS:85087287404
SN - 0304-3894
VL - 400
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 123323
ER -