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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...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2018
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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. |
format | Online Article Text |
id | pubmed-6164349 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
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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