4.7 Article

Effect of ozone treatment on properties of expanded graphite

Journal

CHEMICAL ENGINEERING JOURNAL
Volume 172, Issue 2-3, Pages 1096-1102

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2011.06.005

Keywords

Expanded graphite; Modified expanded graphite; Ozone treated carbons; Phenol

Funding

  1. Ministry of Science and Higher Education of Poland [N N507 479337]

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In this work, ozone modification of expanded graphite (EG) was carried out by streaming ozone through a bed of EG. The results of the reaction were evaluated using structural (Brunauer. Emmet and Teller - BET) and surface chemical composition (X-ray photoelectron spectroscopy - XPS) analysis. Electrochemical activity of ozone-treated EG was studied in the model process of phenol electrooxidation in alkaline solutions using cyclic voltammetry (CV). It can be pointed out that the results of EG modification strongly depend on the temperature of the ozone treatment. Indeed, the process carried out at room temperature yielded C=O containing functional groups on the surface, whereas at higher temperatures C-O species were predominantly formed instead, with a simultaneous considerable increase in the specific surface area. Electrochemical studies revealed that phenol electrooxidation was promoted by the EG, ozone-modified at elevated temperatures. (C) 2011 Elsevier B.V. All rights reserved.

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