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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...

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Autores principales: Sun, Xiong, Li, Hui-Jun, Ou, Nanquan, Lyu, Bowen, Gui, Bojie, Tian, Shiwei, Qian, Dongjin, Wang, Xianying, Yang, Junhe
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
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.
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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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