Journal of Nanomaterials & Molecular NanotechnologyISSN: 2324-8777

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Research Article, J Nanomater Mol Nanotechnol S Vol: 0 Issue: 1

Enhanced Adsorption of Methylene Blue on Graphene Oxide by Tuning the Oxidation Degree of Graphene Oxide

Haiyan Zhang1, Xiaoyan Han1, Zeyu Yang1, Jing Zou2 and Heqing Tang1*
1D1Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, College of Chemistry and Material Science, South Central University for Nationalities, Wuhan 430074,P. R. China
2School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan 430073, P.R. China
Corresponding author : Dr. Heqing Tang
Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, College of Chemistry and Material Science, South Central University for Nationalities, Wuhan 430074, P. R. China
Tel/Fax: +86-27-67843323
E-mail: [email protected]; hqtang[email protected]
Received: May 24, 2013 Accepted: November 14, 2013 Published: November 17, 2013
Citation: Zhang H, Han X, Yang Z, Zou J, Tang H (2013) Enhanced Adsorption of Methylene Blue on Graphene Oxide by Tuning the Oxidation Degree of Graphene Oxide. J Nanomater Mol Nanotechnol S1:003. doi:10.4172/2324-8777.S1-003

Abstract

Enhanced Adsorption of Methylene Blue on Graphene Oxide by Tuning the Oxidation Degree of Graphene Oxide

Graphene oxides (GOs) with different oxidation degrees were prepared and characterized. The adsorption behavior was studied to clarify the correlation between the adsorption ability and the oxidation degree of GO by using methylene blue (MB) as a model compound. It was observed that the adsorption of MB on the oxidized graphene oxides (OGOs) followed the Langmuir isotherm model and that the adsorption kinetics fitted the pseudo second-order model. With increasing the oxidation degree of GO, the maximum adsorption capacity was initially increased and then decreased. By tuning the oxidation degree of GO, the maximum adsorption capacity at 298 K could be increased from 671.1 to 1449.3 mg g-1 by a factor of more than 200%. The significant increase of the adsorption capacity on OGO was attributed to the increased numbers of carboxyl groups on the surface of OGO, which enhanced electrostatic attractions between MB and the adsorbent.

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