An efficient system for electro-Fenton oxidation of pesticide by a reduced graphene oxide-aminopyrazine@3DNi foam gas diffusion electrode
- Authors
- Senthilnathan, Jaganathan; Younis, Sherif A.; Kwon, Eilhann E.; Surenjan, Anupama; Kim, Ki-Hyun; Yoshimura, Masahiro
- Issue Date
- Dec-2020
- Publisher
- ELSEVIER
- Keywords
- Gas-diffusion electrode; Aminopyrazine functionalized graphene oxide; 3D nickel foam; Electro-Fenton process; Dichlorvos; Coated Fe3O4 plate
- Citation
- JOURNAL OF HAZARDOUS MATERIALS, v.400, pp.1 - 14
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF HAZARDOUS MATERIALS
- Volume
- 400
- Start Page
- 1
- End Page
- 14
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/8169
- DOI
- 10.1016/j.jhazmat.2020.123323
- ISSN
- 0304-3894
- Abstract
- 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 fin 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 mu mol 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 conducive 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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