FeOx/MnOy modified oxidized carbon nanotubes as peroxymonosulfate activator for organic pollutants degradation
Copyright © 2020 Elsevier Inc. All rights reserved..
In this work, the FeOx/MnOy decorated oxidized carbon nanotubes (CNTs-Fe-Mn) composites were synthesized and used as catalysts to activate peroxymonosulfate (PMS) for organic pollutants degradation. The catalytic ability of the CNTs-Fe-Mn catalyst was strongly correlated with the oxidation of CNTs and the molar ratio of Fe/Mn. When the CNTs was oxidized by 30 wt% HNO3 and the modified molar ratio of Fe/Mn was 0.5, the 30%-CNTs-Fe-Mn-0.5 showed highest efficiency for rhodamine B (RhB) degradation via activating PMS, and the removal rate of 95% was achieved in 60 min at room temperature in 15 mg L-1 RhB solution with catalyst dosage of 0.1 g L-1. Fe and Mn multivalent oxide species coexisted were randomly distributed on the outer surface and encapsulated into the channels of oxidized CNTs in the 30%-CNTs-Fe-Mn-0.5 catalyst. The XPS results of catalysts before and after reaction proved that the redox cycles between the multivalent states of Fe and Mn ensured the superior catalytic activity of the 30%-CNTs-Fe-Mn-0.5 for PMS activation. The radical quenching tests and D2O experiments confirmed that SO4-, HO· and O2- radicals were the main reactive oxidized species for the oxidation of pollutants in the 30%-CNTs-Fe-Mn-0.5/PMS system. In addition, the influences of operation parameters including initial pH, pollutant concentration, catalyst dosage, and PMS dosage on catalytic degradation were investigated.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2020 |
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| Erschienen: |
2020 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:580 |
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| Enthalten in: |
Journal of colloid and interface science - 580(2020) vom: 15. Nov., Seite 803-813 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Tian, Xue [VerfasserIn] |
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| Links: |
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| Themen: |
Carbon nanotubes |
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| Anmerkungen: |
Date Completed 19.10.2020 Date Revised 19.10.2020 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1016/j.jcis.2020.07.081 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM313067163 |
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| 500 | |a Date Revised 19.10.2020 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a Copyright © 2020 Elsevier Inc. All rights reserved. | ||
| 520 | |a In this work, the FeOx/MnOy decorated oxidized carbon nanotubes (CNTs-Fe-Mn) composites were synthesized and used as catalysts to activate peroxymonosulfate (PMS) for organic pollutants degradation. The catalytic ability of the CNTs-Fe-Mn catalyst was strongly correlated with the oxidation of CNTs and the molar ratio of Fe/Mn. When the CNTs was oxidized by 30 wt% HNO3 and the modified molar ratio of Fe/Mn was 0.5, the 30%-CNTs-Fe-Mn-0.5 showed highest efficiency for rhodamine B (RhB) degradation via activating PMS, and the removal rate of 95% was achieved in 60 min at room temperature in 15 mg L-1 RhB solution with catalyst dosage of 0.1 g L-1. Fe and Mn multivalent oxide species coexisted were randomly distributed on the outer surface and encapsulated into the channels of oxidized CNTs in the 30%-CNTs-Fe-Mn-0.5 catalyst. The XPS results of catalysts before and after reaction proved that the redox cycles between the multivalent states of Fe and Mn ensured the superior catalytic activity of the 30%-CNTs-Fe-Mn-0.5 for PMS activation. The radical quenching tests and D2O experiments confirmed that SO4-, HO· and O2- radicals were the main reactive oxidized species for the oxidation of pollutants in the 30%-CNTs-Fe-Mn-0.5/PMS system. In addition, the influences of operation parameters including initial pH, pollutant concentration, catalyst dosage, and PMS dosage on catalytic degradation were investigated | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Carbon nanotubes | |
| 650 | 4 | |a Fe | |
| 650 | 4 | |a Mn | |
| 650 | 4 | |a Peroxymonosulfate | |
| 650 | 4 | |a Rhodamine B | |
| 700 | 1 | |a Xiao, Ling |e verfasserin |4 aut | |
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| 773 | 1 | 8 | |g volume:580 |g year:2020 |g day:15 |g month:11 |g pages:803-813 |
| 856 | 4 | 0 | |u http://dx.doi.org/10.1016/j.jcis.2020.07.081 |3 Volltext |
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