Preparation and photocatalytic activity of TiO2-exfoliated graphite oxide composite using an ecofriendly graphite oxidation method

•A simple and innovative method to produce exfoliated graphite oxide (EGO) and TiO2-EGO composites.•Ozonation followed by thermal treatment produces a graphite-like structure containing oxygen and sp3 carbon.•TiO2-EGO composites are useful photocatalysts to degrade organic compounds. A simple and ef...

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Bibliographic Details
Published in:Applied surface science 2015-12, Vol.359, p.868-874
Main Authors: Baldissarelli, Vanessa Zanon, de Souza, Thiago, Andrade, Luisa, Oliveira, Luiz Fernando Cappa de, José, Humberto Jorge, Moreira, Regina de Fátima Peralta Muniz
Format: Article
Language:English
Subjects:
Bleaching
Composite
Exfoliated graphite oxide
Exfoliation
Graphite
Heat treatment
Methylene blue
Oxides
Photocatalysis
Surface chemistry
TiO2
Titanium dioxide
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Summary:•A simple and innovative method to produce exfoliated graphite oxide (EGO) and TiO2-EGO composites.•Ozonation followed by thermal treatment produces a graphite-like structure containing oxygen and sp3 carbon.•TiO2-EGO composites are useful photocatalysts to degrade organic compounds. A simple and effective stepwise-method was developed to produce expanded exfoliated graphite oxide (EGO). Using a combination of ozone exposure and thermal treatment we demonstrate that a graphite surface can be modified to generate a graphene-like surface containing oxygen and sp3 carbon. This expanded exfoliated graphite oxide is useful for the production, through thermal treatment, of photocatalytic TiO2-EGO composites which are more active than those produce by the Hummers method. The photocatalytic activity of TiO2-EGO in methylene blue (MB) bleaching under UV light is enhanced in comparison with TiO2 P25.
ISSN:0169-4332
DOI:10.1016/j.apsusc.2015.10.199