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- W3164163552 abstract "• Ni-Fe/Fe 3 O 4 was fabricated as a non-noble metal electrode. • Novel electrocatalytic process was applied for the reduction of nitrate. • Fe 3 O 4 nanoparticles and humic acid played an important role in electrocatalytic activity. • Hydroxyl radical caused oxidation of ammonium to nitrogen gas. The present study aimed to investigate the effect of Fe 3 O 4 nanoparticles and humic acids (HAs) in electrocatalytic denitrification using a non-noble Ni-Fe cathode. As a non-noble metal electrode, the Ni-Fe was prepared through the electrodeposition method and then characterized by physical and electrochemical analyses. The obtained results show that using Fe 3 O 4 NPs, the nitrate (NO 3 − ) reduction efficiency increased from 42% to 84%. Moreover, the ammonium (NH 4 + ) concentration decreased from 6 mg/l to 3.6 mg/l (91.19% selectivity to N 2 ). The NO 3 − reduction efficiency reached from 42% to 85.5% using HAs, and the concentration of NH 4 + decreased to 1.7 mg/l (95.63% selectivity to N 2 ). The nitrite (NO 2 − ) concentration was negligible. The decrease in NH 4 + concentration and increased selectivity to N 2 using Fe 3 O 4 nanoparticles has resulted from radical hydroxyl ( OH) production. Moreover, in the presence of HAs, the superoxide anion ( O 2 ∙ - ) produced, which played an influential role in the production of OH along with hypochlorous acid (HClO). The results revealed that the Ni-Fe/Fe 3 O 4 electrode in the presence of HAs had an outstanding ability for NO 3 − reduction with high efficiency, high selectivity to N 2 , low energy consumption, and low production of dangerous by-products." @default.
- W3164163552 created "2021-06-07" @default.
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- W3164163552 date "2021-10-01" @default.
- W3164163552 modified "2023-09-29" @default.
- W3164163552 title "Enhanced electrocatalytic denitrification using non-noble Ni-Fe electrode supplied by Fe3O4 nanoparticle and humic acid" @default.
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- W3164163552 doi "https://doi.org/10.1016/j.apsusc.2021.150142" @default.
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