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Improvement of Carbonyl Groups and Surface Defects in Carbon Nanotubes to Activate Peroxydisulfate for Tetracycline Degradation

Carbon nanotubes (CNTs) were considered a promising activator for persulfates due to their high electrical conductivity, large specific surface area and low toxicity. The functional groups and surface defects of CNTs could significantly affect their activation performance. In this study, CNTs with h...

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Autores principales: Wang, Wenxi, Zhang, Junjie, Hou, Zhiran, Chen, Pei, Zhou, Xu, Wang, Wei, Tan, Fatang, Wang, Xinyun, Qiao, Xueliang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9824654/
https://www.ncbi.nlm.nih.gov/pubmed/36616125
http://dx.doi.org/10.3390/nano13010216
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author Wang, Wenxi
Zhang, Junjie
Hou, Zhiran
Chen, Pei
Zhou, Xu
Wang, Wei
Tan, Fatang
Wang, Xinyun
Qiao, Xueliang
author_facet Wang, Wenxi
Zhang, Junjie
Hou, Zhiran
Chen, Pei
Zhou, Xu
Wang, Wei
Tan, Fatang
Wang, Xinyun
Qiao, Xueliang
author_sort Wang, Wenxi
collection PubMed
description Carbon nanotubes (CNTs) were considered a promising activator for persulfates due to their high electrical conductivity, large specific surface area and low toxicity. The functional groups and surface defects of CNTs could significantly affect their activation performance. In this study, CNTs with high C=O ratio and defect density (CNT-O-H) were prepared through a facile treatment of raw CNTs with HNO(3) oxidation followed by calcination at 800 °C under an argon atmosphere. X-ray photoelectron spectroscopy (XPS) and Raman results showed that the C=O proportion and defect degree (I(D)/I(G)) rose to 75% and 1.53, respectively. The obtained CNT-O-H possessed a superior performance towards peroxydisulfate (PDS) activation, and the degradation efficiency of tetracycline (TC) in the CNT-O-H/PDS system was increased to 75.2% from 56.2% of the raw CNTs/PDS system within 40 min. Moreover, the activity of CNT-O-H after use could be easily recovered with re-calcination. In addition, the CNT-O-H/PDS system exhibited high adaptabilities towards wide solution pH (2–10), common coexisting substances and diverse organic pollutants. Singlet oxygen ((1)O(2)) was confirmed to be the dominant reactive oxygen species (ROS) generated in the CNT-O-H/PDS system. It was inferred that surface C=O groups and defects of CNTs were the key site to activate PDS for TC degradation.
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spelling pubmed-98246542023-01-08 Improvement of Carbonyl Groups and Surface Defects in Carbon Nanotubes to Activate Peroxydisulfate for Tetracycline Degradation Wang, Wenxi Zhang, Junjie Hou, Zhiran Chen, Pei Zhou, Xu Wang, Wei Tan, Fatang Wang, Xinyun Qiao, Xueliang Nanomaterials (Basel) Article Carbon nanotubes (CNTs) were considered a promising activator for persulfates due to their high electrical conductivity, large specific surface area and low toxicity. The functional groups and surface defects of CNTs could significantly affect their activation performance. In this study, CNTs with high C=O ratio and defect density (CNT-O-H) were prepared through a facile treatment of raw CNTs with HNO(3) oxidation followed by calcination at 800 °C under an argon atmosphere. X-ray photoelectron spectroscopy (XPS) and Raman results showed that the C=O proportion and defect degree (I(D)/I(G)) rose to 75% and 1.53, respectively. The obtained CNT-O-H possessed a superior performance towards peroxydisulfate (PDS) activation, and the degradation efficiency of tetracycline (TC) in the CNT-O-H/PDS system was increased to 75.2% from 56.2% of the raw CNTs/PDS system within 40 min. Moreover, the activity of CNT-O-H after use could be easily recovered with re-calcination. In addition, the CNT-O-H/PDS system exhibited high adaptabilities towards wide solution pH (2–10), common coexisting substances and diverse organic pollutants. Singlet oxygen ((1)O(2)) was confirmed to be the dominant reactive oxygen species (ROS) generated in the CNT-O-H/PDS system. It was inferred that surface C=O groups and defects of CNTs were the key site to activate PDS for TC degradation. MDPI 2023-01-03 /pmc/articles/PMC9824654/ /pubmed/36616125 http://dx.doi.org/10.3390/nano13010216 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Wang, Wenxi
Zhang, Junjie
Hou, Zhiran
Chen, Pei
Zhou, Xu
Wang, Wei
Tan, Fatang
Wang, Xinyun
Qiao, Xueliang
Improvement of Carbonyl Groups and Surface Defects in Carbon Nanotubes to Activate Peroxydisulfate for Tetracycline Degradation
title Improvement of Carbonyl Groups and Surface Defects in Carbon Nanotubes to Activate Peroxydisulfate for Tetracycline Degradation
title_full Improvement of Carbonyl Groups and Surface Defects in Carbon Nanotubes to Activate Peroxydisulfate for Tetracycline Degradation
title_fullStr Improvement of Carbonyl Groups and Surface Defects in Carbon Nanotubes to Activate Peroxydisulfate for Tetracycline Degradation
title_full_unstemmed Improvement of Carbonyl Groups and Surface Defects in Carbon Nanotubes to Activate Peroxydisulfate for Tetracycline Degradation
title_short Improvement of Carbonyl Groups and Surface Defects in Carbon Nanotubes to Activate Peroxydisulfate for Tetracycline Degradation
title_sort improvement of carbonyl groups and surface defects in carbon nanotubes to activate peroxydisulfate for tetracycline degradation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9824654/
https://www.ncbi.nlm.nih.gov/pubmed/36616125
http://dx.doi.org/10.3390/nano13010216
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