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Green and Effective Removal of Aqueous Graphene Oxide under UV-Light Irradiation

The potential extensive application of graphene oxide (GO) in various fields results in the possibility of its release into the natural environment with negative impacts on humans and the ecosystem. The UV-induced removal behavior of aqueous GO was evaluated in this study, and the effect of various...

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Autores principales: Yuan, Xiaoya, Peng, Dong, Jing, Qiuye, Niu, Jiawei, Cheng, Xin, Feng, Zijuan, Wu, Xue
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6164349/
https://www.ncbi.nlm.nih.gov/pubmed/30149536
http://dx.doi.org/10.3390/nano8090654
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author Yuan, Xiaoya
Peng, Dong
Jing, Qiuye
Niu, Jiawei
Cheng, Xin
Feng, Zijuan
Wu, Xue
author_facet Yuan, Xiaoya
Peng, Dong
Jing, Qiuye
Niu, Jiawei
Cheng, Xin
Feng, Zijuan
Wu, Xue
author_sort Yuan, Xiaoya
collection PubMed
description The potential extensive application of graphene oxide (GO) in various fields results in the possibility of its release into the natural environment with negative impacts on humans and the ecosystem. The UV-induced removal behavior of aqueous GO was evaluated in this study, and the effect of various parameters (including initial GO concentration, initial solution pH and co-existing ions) on removal rate of GO were investigated in detail. The results showed that UV-light induced a maximum removal rate of GO of 99.1% after 32 h irradiation without any additives, and that the photo-induced removal process in all cases fitted well with pseudo-first-order kinetics. Under optimal conditions, GO was completely removed, with initial GO concentrations of 10 mg/L while adjusting solution pH to 3 or adding Ca(2+)-containing salt. The GO and photoreduced graphene oxide (prGO) were characterized using High-resolution Transmission Microscopy (HRTEM), X-ray Photoelectron Spectroscopy (XPS), and Fourier-transform Infrared Spectroscopy (FT-IR). The radical species trapping experiments and Electron Spin Resonance (ESR) tests indicated that self-reduction of GO upon UV-light exposure could be achieved via photogenerated electrons from a GO semiconductor. Further mechanism study showed that the high efficiency of UV-induced GO removal came from UV-induced photoreduction, and pH-induced or cation-induced coagulation. This study provided a green and effective method to remove GO from aqueous solutions.
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spelling pubmed-61643492018-10-10 Green and Effective Removal of Aqueous Graphene Oxide under UV-Light Irradiation Yuan, Xiaoya Peng, Dong Jing, Qiuye Niu, Jiawei Cheng, Xin Feng, Zijuan Wu, Xue Nanomaterials (Basel) Article The potential extensive application of graphene oxide (GO) in various fields results in the possibility of its release into the natural environment with negative impacts on humans and the ecosystem. The UV-induced removal behavior of aqueous GO was evaluated in this study, and the effect of various parameters (including initial GO concentration, initial solution pH and co-existing ions) on removal rate of GO were investigated in detail. The results showed that UV-light induced a maximum removal rate of GO of 99.1% after 32 h irradiation without any additives, and that the photo-induced removal process in all cases fitted well with pseudo-first-order kinetics. Under optimal conditions, GO was completely removed, with initial GO concentrations of 10 mg/L while adjusting solution pH to 3 or adding Ca(2+)-containing salt. The GO and photoreduced graphene oxide (prGO) were characterized using High-resolution Transmission Microscopy (HRTEM), X-ray Photoelectron Spectroscopy (XPS), and Fourier-transform Infrared Spectroscopy (FT-IR). The radical species trapping experiments and Electron Spin Resonance (ESR) tests indicated that self-reduction of GO upon UV-light exposure could be achieved via photogenerated electrons from a GO semiconductor. Further mechanism study showed that the high efficiency of UV-induced GO removal came from UV-induced photoreduction, and pH-induced or cation-induced coagulation. This study provided a green and effective method to remove GO from aqueous solutions. MDPI 2018-08-24 /pmc/articles/PMC6164349/ /pubmed/30149536 http://dx.doi.org/10.3390/nano8090654 Text en © 2018 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Yuan, Xiaoya
Peng, Dong
Jing, Qiuye
Niu, Jiawei
Cheng, Xin
Feng, Zijuan
Wu, Xue
Green and Effective Removal of Aqueous Graphene Oxide under UV-Light Irradiation
title Green and Effective Removal of Aqueous Graphene Oxide under UV-Light Irradiation
title_full Green and Effective Removal of Aqueous Graphene Oxide under UV-Light Irradiation
title_fullStr Green and Effective Removal of Aqueous Graphene Oxide under UV-Light Irradiation
title_full_unstemmed Green and Effective Removal of Aqueous Graphene Oxide under UV-Light Irradiation
title_short Green and Effective Removal of Aqueous Graphene Oxide under UV-Light Irradiation
title_sort green and effective removal of aqueous graphene oxide under uv-light irradiation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6164349/
https://www.ncbi.nlm.nih.gov/pubmed/30149536
http://dx.doi.org/10.3390/nano8090654
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