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Visible-Light Driven TiO(2) Photocatalyst Coated with Graphene Quantum Dots of Tunable Nitrogen Doping
Nitrogen doped graphene quantum dots (NGQDs) were successfully prepared via a hydrothermal method using citric acid and urea as the carbon and nitrogen precursors, respectively. Due to different post-treatment processes, the obtained NGQDs with different surface modifications exhibited blue light em...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6359080/ https://www.ncbi.nlm.nih.gov/pubmed/30669386 http://dx.doi.org/10.3390/molecules24020344 |
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author | Sun, Xiong Li, Hui-Jun Ou, Nanquan Lyu, Bowen Gui, Bojie Tian, Shiwei Qian, Dongjin Wang, Xianying Yang, Junhe |
author_facet | Sun, Xiong Li, Hui-Jun Ou, Nanquan Lyu, Bowen Gui, Bojie Tian, Shiwei Qian, Dongjin Wang, Xianying Yang, Junhe |
author_sort | Sun, Xiong |
collection | PubMed |
description | Nitrogen doped graphene quantum dots (NGQDs) were successfully prepared via a hydrothermal method using citric acid and urea as the carbon and nitrogen precursors, respectively. Due to different post-treatment processes, the obtained NGQDs with different surface modifications exhibited blue light emission, while their visible-light absorption was obviously different. To further understand the roles of nitrogen dopants and N-containing surface groups of NGQDs in the photocatalytic performance, their corresponding composites with TiO(2) were utilized to degrade RhB solutions under visible-light irradiation. A series of characterization and photocatalytic performance tests were carried out, which demonstrated that NGQDs play a significant role in enhancing visible-light driven photocatalytic activity and the carrier separation process. The enhanced photocatalytic activity of the NGQDs/TiO(2) composites can possibly be attributed to an enhanced visible light absorption ability, and an improved separation and transfer rate of photogenerated carriers. |
format | Online Article Text |
id | pubmed-6359080 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-63590802019-02-06 Visible-Light Driven TiO(2) Photocatalyst Coated with Graphene Quantum Dots of Tunable Nitrogen Doping Sun, Xiong Li, Hui-Jun Ou, Nanquan Lyu, Bowen Gui, Bojie Tian, Shiwei Qian, Dongjin Wang, Xianying Yang, Junhe Molecules Article Nitrogen doped graphene quantum dots (NGQDs) were successfully prepared via a hydrothermal method using citric acid and urea as the carbon and nitrogen precursors, respectively. Due to different post-treatment processes, the obtained NGQDs with different surface modifications exhibited blue light emission, while their visible-light absorption was obviously different. To further understand the roles of nitrogen dopants and N-containing surface groups of NGQDs in the photocatalytic performance, their corresponding composites with TiO(2) were utilized to degrade RhB solutions under visible-light irradiation. A series of characterization and photocatalytic performance tests were carried out, which demonstrated that NGQDs play a significant role in enhancing visible-light driven photocatalytic activity and the carrier separation process. The enhanced photocatalytic activity of the NGQDs/TiO(2) composites can possibly be attributed to an enhanced visible light absorption ability, and an improved separation and transfer rate of photogenerated carriers. MDPI 2019-01-18 /pmc/articles/PMC6359080/ /pubmed/30669386 http://dx.doi.org/10.3390/molecules24020344 Text en © 2019 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 Sun, Xiong Li, Hui-Jun Ou, Nanquan Lyu, Bowen Gui, Bojie Tian, Shiwei Qian, Dongjin Wang, Xianying Yang, Junhe Visible-Light Driven TiO(2) Photocatalyst Coated with Graphene Quantum Dots of Tunable Nitrogen Doping |
title | Visible-Light Driven TiO(2) Photocatalyst Coated with Graphene Quantum Dots of Tunable Nitrogen Doping |
title_full | Visible-Light Driven TiO(2) Photocatalyst Coated with Graphene Quantum Dots of Tunable Nitrogen Doping |
title_fullStr | Visible-Light Driven TiO(2) Photocatalyst Coated with Graphene Quantum Dots of Tunable Nitrogen Doping |
title_full_unstemmed | Visible-Light Driven TiO(2) Photocatalyst Coated with Graphene Quantum Dots of Tunable Nitrogen Doping |
title_short | Visible-Light Driven TiO(2) Photocatalyst Coated with Graphene Quantum Dots of Tunable Nitrogen Doping |
title_sort | visible-light driven tio(2) photocatalyst coated with graphene quantum dots of tunable nitrogen doping |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6359080/ https://www.ncbi.nlm.nih.gov/pubmed/30669386 http://dx.doi.org/10.3390/molecules24020344 |
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