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Journal of Materials Science

, Volume 51, Issue 10, pp 4928–4941 | Cite as

Thermodynamics of dye adsorption on electrochemically exfoliated graphene

  • Zhishuang Xue
  • Shanlin Zhao
  • Zenghua Zhao
  • Ping Li
  • Jianhui Gao
Original Paper

Abstract

Graphene sheets prepared by electrochemical exfoliation have been used for the adsorption of methylene blue (MB), a cationic dye from aqueous solution. The maximum adsorbed amount of MB on exfoliated graphene (EG) reaches 511.7 mg g−1 when the initial concentration of MB is 500 mg L−1, with EG whose dosage is 10 mg. Further study on the adsorption mechanism of EG includes isothermal adsorption equilibrium, thermodynamics, and kinetics. The study on isothermal adsorption equilibrium shows that the adsorption follows the Langmuir isotherm. Various thermodynamic parameters such as Gibbs free energy (∆G 0), enthalpy (∆H 0), and entropy (∆S 0) change were also evaluated. It indicates that the adsorption is a spontaneous, endothermic, and physical adsorption process. The kinetic data reveals that the adsorption process of MB fits well with the pseudo second-order model. The Weber’s intra-particle diffusion model demonstrates that the adsorption rate is controlled by both external diffusion and intra-particle diffusion. EG as a cationic dye scavenger displays high speed and efficiency.

Keywords

Adsorption Capacity Graphene Oxide Methylene Blue Adsorption Process Adsorbent Dosage 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

This study was funded by Science and Technology Department of Liaoning Province (Grant number 2011223011).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

10853_2016_9798_MOESM1_ESM.docx (443 kb)
Supplementary material 1 (DOCX 443 kb)

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Zhishuang Xue
    • 1
  • Shanlin Zhao
    • 1
  • Zenghua Zhao
    • 2
  • Ping Li
    • 1
  • Jianhui Gao
    • 1
  1. 1.School of Chemistry, Chemical Engineering and Environmental EngineeringLiaoning Shihua UniversityFushunPeople’s Republic of China
  2. 2.State Key Laboratory of Multiphase Complex Systems, Institute of Process EngineeringChinese Academy of SciencesBeijingPeople’s Republic of China

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