High-yield synthesis, optical properties and photocatalytic performance of graphitic carbon nitride

Graphitic carbon nitride (g-C3N4), an emerging graphene-like two-dimensional (2D) material, has received wide attention by its fascinating photocatalytic performances as a photocatalyst in a variety of photocatalytic reactions such as photocatalytic water splitting and photocatalytic degradation. Ow...

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Main Author: Yuan, Yanwen
Other Authors: Xiong Qihua
Format: Theses and Dissertations
Language:English
Published: 2016
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Online Access:http://hdl.handle.net/10356/68843
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-688432023-02-28T23:41:51Z High-yield synthesis, optical properties and photocatalytic performance of graphitic carbon nitride Yuan, Yanwen Xiong Qihua School of Physical and Mathematical Sciences DRNTU::Science Graphitic carbon nitride (g-C3N4), an emerging graphene-like two-dimensional (2D) material, has received wide attention by its fascinating photocatalytic performances as a photocatalyst in a variety of photocatalytic reactions such as photocatalytic water splitting and photocatalytic degradation. Owing to a bandgap of 2.7 eV, g-C3N4 is able to make use of the renewable and sustainable solar energy and conduct photocatalytic reaction under visible-light. Moreover, g-C3N4 is inexpensive, abundant and eco-friendly. It also has high thermal and chemical stability. Therefore, researchers believe that g-C3N4 is the most promising photocatalyst to serve in environmental protection and energy conservation. Studies on the chemical, optical and photocatalytic properties of g-C3N4 is very important and of great interests to the public. In the thesis, we report the synthesis, characterizations, and photocatalytic application of g-C3N4 products. High-yield synthesis of g-C3N4 powder via sealed heating method and half-sealed heating method are demonstrated. Based on the g-C3N4 powder, the g-C3N4 films are further produced by vacuum heating deposition and thermal evaporator. The chemical composition and crystallization of the as-prepared g-C3N4 products are demonstrated by multiple characterizations such as thermal gravimetric analysis, X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, scanning transmission electron microscopy and electron energy loss spectroscopy. On the other hand, a systematic optical study of g-C3N4 is carried out with several approaches. Using infrared and Raman spectroscopy, the chemical band vibrational modes of g-C3N4 products are revealed, and the absorption and emission property of g-C3N4 are investigated by UV-visible spectroscopy and photoluminescence spectroscopy. Moreover, the photocatalytic property of g-C3N4 is explored by the photodegradation experiment. We also build g-C3N4\hematite heterojunctions and study its photocatalytic water splitting performance. ​Doctor of Philosophy (SPMS) 2016-06-10T02:40:48Z 2016-06-10T02:40:48Z 2016 Thesis http://hdl.handle.net/10356/68843 en 153 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Science
spellingShingle DRNTU::Science
Yuan, Yanwen
High-yield synthesis, optical properties and photocatalytic performance of graphitic carbon nitride
description Graphitic carbon nitride (g-C3N4), an emerging graphene-like two-dimensional (2D) material, has received wide attention by its fascinating photocatalytic performances as a photocatalyst in a variety of photocatalytic reactions such as photocatalytic water splitting and photocatalytic degradation. Owing to a bandgap of 2.7 eV, g-C3N4 is able to make use of the renewable and sustainable solar energy and conduct photocatalytic reaction under visible-light. Moreover, g-C3N4 is inexpensive, abundant and eco-friendly. It also has high thermal and chemical stability. Therefore, researchers believe that g-C3N4 is the most promising photocatalyst to serve in environmental protection and energy conservation. Studies on the chemical, optical and photocatalytic properties of g-C3N4 is very important and of great interests to the public. In the thesis, we report the synthesis, characterizations, and photocatalytic application of g-C3N4 products. High-yield synthesis of g-C3N4 powder via sealed heating method and half-sealed heating method are demonstrated. Based on the g-C3N4 powder, the g-C3N4 films are further produced by vacuum heating deposition and thermal evaporator. The chemical composition and crystallization of the as-prepared g-C3N4 products are demonstrated by multiple characterizations such as thermal gravimetric analysis, X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, scanning transmission electron microscopy and electron energy loss spectroscopy. On the other hand, a systematic optical study of g-C3N4 is carried out with several approaches. Using infrared and Raman spectroscopy, the chemical band vibrational modes of g-C3N4 products are revealed, and the absorption and emission property of g-C3N4 are investigated by UV-visible spectroscopy and photoluminescence spectroscopy. Moreover, the photocatalytic property of g-C3N4 is explored by the photodegradation experiment. We also build g-C3N4\hematite heterojunctions and study its photocatalytic water splitting performance.
author2 Xiong Qihua
author_facet Xiong Qihua
Yuan, Yanwen
format Theses and Dissertations
author Yuan, Yanwen
author_sort Yuan, Yanwen
title High-yield synthesis, optical properties and photocatalytic performance of graphitic carbon nitride
title_short High-yield synthesis, optical properties and photocatalytic performance of graphitic carbon nitride
title_full High-yield synthesis, optical properties and photocatalytic performance of graphitic carbon nitride
title_fullStr High-yield synthesis, optical properties and photocatalytic performance of graphitic carbon nitride
title_full_unstemmed High-yield synthesis, optical properties and photocatalytic performance of graphitic carbon nitride
title_sort high-yield synthesis, optical properties and photocatalytic performance of graphitic carbon nitride
publishDate 2016
url http://hdl.handle.net/10356/68843
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