Strategies to enhance the stability of nanoscale zero-valent iron (NZVI) in continuous BrO3- reduction
Copyright © 2018 Elsevier Ltd. All rights reserved..
The reduction of bromate to bromide was successfully achieved by bimetallic catalysts with NZVI support in continuous-flow reactors. The stability of NZVI-supported bimetallic catalysts was enhanced by decelerating the iron corrosion and sequential rapid passivation of the iron-Cu-Pd ensembles under optimized reaction conditions. Thus >99% bromate removal can be continuously achieved for 11 h. The lifetime of the bimetallic catalyst was further enhanced and tested under different hydraulic retention time, catalyst loading, and initial bromate concentrations. At the optimized operation conditions, the catalyst showed a complete bromate reduction by 24 h and then the reactivity slowly decreased to 20% over the next 100 h. X-ray diffraction and X-ray photoelectron spectroscopy showed that the reactive NZVI support was oxidized to Fe(II) and Fe(III) along with Cu(0) oxidation to CuO, while the oxidation state of Pd did not change. Therefore, bromate reduction occurred on the surface of reactive NZVI support and Cu(0) particle, while Pd played a role as a hydrogenation catalyst that prolonged the lifetime of the bimetallic catalyst.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2019 |
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| Erschienen: |
2019 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:231 |
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| Enthalten in: |
Journal of environmental management - 231(2019) vom: 01. Feb., Seite 714-725 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Hamid, Shanawar [VerfasserIn] |
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| Links: |
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| Themen: |
Bimetallic catalyst |
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| Anmerkungen: |
Date Completed 24.09.2019 Date Revised 25.09.2019 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1016/j.jenvman.2018.10.026 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM290327369 |
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| 245 | 1 | 0 | |a Strategies to enhance the stability of nanoscale zero-valent iron (NZVI) in continuous BrO3- reduction |
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| 500 | |a Date Completed 24.09.2019 | ||
| 500 | |a Date Revised 25.09.2019 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a Copyright © 2018 Elsevier Ltd. All rights reserved. | ||
| 520 | |a The reduction of bromate to bromide was successfully achieved by bimetallic catalysts with NZVI support in continuous-flow reactors. The stability of NZVI-supported bimetallic catalysts was enhanced by decelerating the iron corrosion and sequential rapid passivation of the iron-Cu-Pd ensembles under optimized reaction conditions. Thus >99% bromate removal can be continuously achieved for 11 h. The lifetime of the bimetallic catalyst was further enhanced and tested under different hydraulic retention time, catalyst loading, and initial bromate concentrations. At the optimized operation conditions, the catalyst showed a complete bromate reduction by 24 h and then the reactivity slowly decreased to 20% over the next 100 h. X-ray diffraction and X-ray photoelectron spectroscopy showed that the reactive NZVI support was oxidized to Fe(II) and Fe(III) along with Cu(0) oxidation to CuO, while the oxidation state of Pd did not change. Therefore, bromate reduction occurred on the surface of reactive NZVI support and Cu(0) particle, while Pd played a role as a hydrogenation catalyst that prolonged the lifetime of the bimetallic catalyst | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Bimetallic catalyst | |
| 650 | 4 | |a Bromate reduction | |
| 650 | 4 | |a Catalyst stability | |
| 650 | 4 | |a NZVI | |
| 650 | 4 | |a NZVI-Cu-Pd | |
| 650 | 7 | |a Water Pollutants, Chemical |2 NLM | |
| 650 | 7 | |a Iron |2 NLM | |
| 650 | 7 | |a E1UOL152H7 |2 NLM | |
| 700 | 1 | |a Abudanash, Damira |e verfasserin |4 aut | |
| 700 | 1 | |a Han, Seunghee |e verfasserin |4 aut | |
| 700 | 1 | |a Kim, Jong R |e verfasserin |4 aut | |
| 700 | 1 | |a Lee, Woojin |e verfasserin |4 aut | |
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