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Effective photoreduction of graphene oxide for photodegradation of volatile organic compounds

Nowadays, humans spend most of their time indoors and are frequently exposed to volatile organic compounds (VOCs) from various sources. The photocatalytic oxidation (PCO) method is a relatively more efficient method than the adsorption method for removing VOCs from the environment. In this work, gra...

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Main Authors:	Tai, Xin Hong, Chook, Soon Wei, Lai, Chin Wei, Lee, Kian Mun, Yang, Thomas Chung Kuang, Chong, Siewhui, Juan, Joon Ching
Format:	Article
Published:	Royal Society of Chemistry 2019
Subjects:	TP Chemical technology
Online Access:	http://eprints.um.edu.my/23346/ https://doi.org/10.1039/C9RA01209E
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spelling	my.um.eprints.233462020-01-08T06:10:02Z http://eprints.um.edu.my/23346/ Effective photoreduction of graphene oxide for photodegradation of volatile organic compounds Tai, Xin Hong Chook, Soon Wei Lai, Chin Wei Lee, Kian Mun Yang, Thomas Chung Kuang Chong, Siewhui Juan, Joon Ching TP Chemical technology Nowadays, humans spend most of their time indoors and are frequently exposed to volatile organic compounds (VOCs) from various sources. The photocatalytic oxidation (PCO) method is a relatively more efficient method than the adsorption method for removing VOCs from the environment. In this work, graphene oxide (GO) was partially reduced via photoreduction under ultraviolet light (UV-A) irradiation and then used as a photocatalyst to degrade VOCs. After photoreduction, the band gap of the partially reduced graphene oxide (PRGO) decreased from 3.5-4.5 eV to 3.1-4.0 eV. Methanol vapour, which acts as a model VOC, was photodegraded using the PRGO. The effectiveness of the PRGO was mainly due to the removal of oxygen functional groups and restoration of the sp2 domain. This lowered the band gap and slowed down the electron recombination rate, which resulted in a higher photocatalytic activity. The photocatalytic activity of PRGO followed pseudo-first order kinetics, with a rate constant of 0.0025 min-1, and it could be reused for five cycles without any significant loss in the photocatalytic activity. This study demonstrates the potential of PRGO as a versatile and stable metal-free photocatalyst to remove indoor pollutants. © The Royal Society of Chemistry. Royal Society of Chemistry 2019 Article PeerReviewed Tai, Xin Hong and Chook, Soon Wei and Lai, Chin Wei and Lee, Kian Mun and Yang, Thomas Chung Kuang and Chong, Siewhui and Juan, Joon Ching (2019) Effective photoreduction of graphene oxide for photodegradation of volatile organic compounds. RSC Advances, 9 (31). pp. 18076-18086. ISSN 2046-2069 https://doi.org/10.1039/C9RA01209E doi:10.1039/C9RA01209E
institution	Universiti Malaya
building	UM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaya
content_source	UM Research Repository
url_provider	http://eprints.um.edu.my/
topic	TP Chemical technology
spellingShingle	TP Chemical technology Tai, Xin Hong Chook, Soon Wei Lai, Chin Wei Lee, Kian Mun Yang, Thomas Chung Kuang Chong, Siewhui Juan, Joon Ching Effective photoreduction of graphene oxide for photodegradation of volatile organic compounds
description	Nowadays, humans spend most of their time indoors and are frequently exposed to volatile organic compounds (VOCs) from various sources. The photocatalytic oxidation (PCO) method is a relatively more efficient method than the adsorption method for removing VOCs from the environment. In this work, graphene oxide (GO) was partially reduced via photoreduction under ultraviolet light (UV-A) irradiation and then used as a photocatalyst to degrade VOCs. After photoreduction, the band gap of the partially reduced graphene oxide (PRGO) decreased from 3.5-4.5 eV to 3.1-4.0 eV. Methanol vapour, which acts as a model VOC, was photodegraded using the PRGO. The effectiveness of the PRGO was mainly due to the removal of oxygen functional groups and restoration of the sp2 domain. This lowered the band gap and slowed down the electron recombination rate, which resulted in a higher photocatalytic activity. The photocatalytic activity of PRGO followed pseudo-first order kinetics, with a rate constant of 0.0025 min-1, and it could be reused for five cycles without any significant loss in the photocatalytic activity. This study demonstrates the potential of PRGO as a versatile and stable metal-free photocatalyst to remove indoor pollutants. © The Royal Society of Chemistry.
format	Article
author	Tai, Xin Hong Chook, Soon Wei Lai, Chin Wei Lee, Kian Mun Yang, Thomas Chung Kuang Chong, Siewhui Juan, Joon Ching
author_facet	Tai, Xin Hong Chook, Soon Wei Lai, Chin Wei Lee, Kian Mun Yang, Thomas Chung Kuang Chong, Siewhui Juan, Joon Ching
author_sort	Tai, Xin Hong
title	Effective photoreduction of graphene oxide for photodegradation of volatile organic compounds
title_short	Effective photoreduction of graphene oxide for photodegradation of volatile organic compounds
title_full	Effective photoreduction of graphene oxide for photodegradation of volatile organic compounds
title_fullStr	Effective photoreduction of graphene oxide for photodegradation of volatile organic compounds
title_full_unstemmed	Effective photoreduction of graphene oxide for photodegradation of volatile organic compounds
title_sort	effective photoreduction of graphene oxide for photodegradation of volatile organic compounds
publisher	Royal Society of Chemistry
publishDate	2019
url	http://eprints.um.edu.my/23346/ https://doi.org/10.1039/C9RA01209E
_version_	1657488195995041792
score	13.211869

Effective photoreduction of graphene oxide for photodegradation of volatile organic compounds

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