Three-Dimensional Graphene Oxide Nanostructure for Fast and Efficient Water-Soluble Dye Removal

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In this study, we demonstrated the potential of graphene nanomaterials as environmental pollutant adsorbents by utilizing the characteristics of ultralarge surface area and strong pi-pi interaction on the surface. We generated a three-dimensional (3D) graphene oxide sponge (GO sponge) from a GO suspension through a simple centrifugal vacuum evaporation method, and used them to remove both the methylene blue (MB) and methyl violet (MV) dyes which are main contaminants from the dye manufacturing and textile finishing. The efficiency and speed of dye adsorption on a GO sponge was investigated under various parameters such as contact time, stirring speed, temperature, and pH. The adsorption process shows that 99.1% of MB and 98.8% of MV have been removed and the equilibrium status has been reached in 2 min. The 3D GO sponge diplays adsorption capacity as high as 397 and 467 mg g(-1) for MB and MV dye, respectively, and the kinetic data reveal that the adsorption process of MB and MV dyes is well matched with the pseudo second order model. The MB and MV adsorption on the 3D GO sponge involved in endothermic chemical adsorption through the strong pi-pi stacking and anion-cation interaction with the activation energy of 50.3 and 70.9 kJ mol(-1), respectively. The 3D GO sponge has demonstrated its high capability as an organic dye scavenger with high speed and efficiency.
Publisher
AMER CHEMICAL SOC
Issue Date
2012-02
Language
English
Article Type
Article
Keywords

WALLED CARBON NANOTUBES; METHYLENE-BLUE; ACTIVATED CARBON; AQUEOUS-SOLUTION; CATIONIC DYES; ADSORPTION; KINETICS; SORPTION; FILMS; THERMODYNAMICS

Citation

ACS APPLIED MATERIALS & INTERFACES, v.4, no.2, pp.922 - 927

ISSN
1944-8244
DOI
10.1021/am201590z
URI
http://hdl.handle.net/10203/99571
Appears in Collection
CBE-Journal Papers(저널논문)
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