Enhanced photoelectrocatalytic oxidation of hypophosphite and simultaneous recovery of metallic nickel via carbon aerogel cathode
Copyright © 2023. Published by Elsevier B.V..
Carbon aerogel (CA) cathode was adopted to an undivided-chamber photoelectrocatalytic system with TiO2 nanotube arrays (TNA) photoanode to enhance the oxidation of hypophosphite (H2PO2-) and simultaneous recovery of metallic nickel (Ni). Both the efficiencies of H2PO2- oxidation and Ni recovery were significantly enhanced after replacing Ti or carbon fiber paper cathode with CA cathode. With 1.0 mM H2PO2- and 1.0 mM Ni2+, the ratio of PO43- production increased from ∼41% or ∼54% to ∼100%, and the ratio of Ni recovery increased from ∼20% or ∼ 37% to ∼93% within 180 min at 3.0 V. H2PO2- was finally oxidized to PO43- by •OH radicals, which was speculated to be generated from UV/H2O2 and bound on TNA photoanode. Meanwhile, Ni2+ was eventually electro-reduced to metallic Ni by a two-electron reduction reaction. The efficiencies of H2PO2- oxidation and Ni recovery were favored at higher cell voltage, faintly acid conditions and larger H2PO2- concentration. The stability of this system exhibited that the ratio of PO43- production increased significantly in each cycle, which was attributed to the increase of H2O2 in-situ-generation via CA cathode caused by deposition of metallic Ni. Finally, the treatment of actual electroless nickel plating effluents was demonstrated.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2023 |
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| Erschienen: |
2023 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:448 |
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| Enthalten in: |
Journal of hazardous materials - 448(2023) vom: 15. Apr., Seite 130601 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Zhang, Juanjuan [VerfasserIn] |
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| Links: |
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| Themen: |
•OH radicals |
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| Anmerkungen: |
Date Completed 28.02.2023 Date Revised 28.02.2023 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1016/j.jhazmat.2022.130601 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM352560533 |
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| 245 | 1 | 0 | |a Enhanced photoelectrocatalytic oxidation of hypophosphite and simultaneous recovery of metallic nickel via carbon aerogel cathode |
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| 500 | |a Date Completed 28.02.2023 | ||
| 500 | |a Date Revised 28.02.2023 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a Copyright © 2023. Published by Elsevier B.V. | ||
| 520 | |a Carbon aerogel (CA) cathode was adopted to an undivided-chamber photoelectrocatalytic system with TiO2 nanotube arrays (TNA) photoanode to enhance the oxidation of hypophosphite (H2PO2-) and simultaneous recovery of metallic nickel (Ni). Both the efficiencies of H2PO2- oxidation and Ni recovery were significantly enhanced after replacing Ti or carbon fiber paper cathode with CA cathode. With 1.0 mM H2PO2- and 1.0 mM Ni2+, the ratio of PO43- production increased from ∼41% or ∼54% to ∼100%, and the ratio of Ni recovery increased from ∼20% or ∼ 37% to ∼93% within 180 min at 3.0 V. H2PO2- was finally oxidized to PO43- by •OH radicals, which was speculated to be generated from UV/H2O2 and bound on TNA photoanode. Meanwhile, Ni2+ was eventually electro-reduced to metallic Ni by a two-electron reduction reaction. The efficiencies of H2PO2- oxidation and Ni recovery were favored at higher cell voltage, faintly acid conditions and larger H2PO2- concentration. The stability of this system exhibited that the ratio of PO43- production increased significantly in each cycle, which was attributed to the increase of H2O2 in-situ-generation via CA cathode caused by deposition of metallic Ni. Finally, the treatment of actual electroless nickel plating effluents was demonstrated | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Carbon aerogel cathode | |
| 650 | 4 | |a Hypophosphite oxidation | |
| 650 | 4 | |a Nickel recovery | |
| 650 | 4 | |a Photoelectrocatalytic | |
| 650 | 4 | |a •OH radicals | |
| 700 | 1 | |a Li, Yibing |e verfasserin |4 aut | |
| 700 | 1 | |a Xie, Tengfei |e verfasserin |4 aut | |
| 700 | 1 | |a Cui, Yuexin |e verfasserin |4 aut | |
| 700 | 1 | |a Mao, Ran |e verfasserin |4 aut | |
| 700 | 1 | |a Zhao, Xu |e verfasserin |4 aut | |
| 773 | 0 | 8 | |i Enthalten in |t Journal of hazardous materials |d 1998 |g 448(2023) vom: 15. Apr., Seite 130601 |w (DE-627)NLM093662688 |x 1873-3336 |7 nnns |
| 773 | 1 | 8 | |g volume:448 |g year:2023 |g day:15 |g month:04 |g pages:130601 |
| 856 | 4 | 0 | |u http://dx.doi.org/10.1016/j.jhazmat.2022.130601 |3 Volltext |
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