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Water, Air, & Soil Pollution

, 228:320 | Cite as

Graphene as an Efficient and Reusable Adsorbent Compared to Activated Carbons for the Removal of Phenol from Aqueous Solutions

  • Dina Gaber
  • Mohammad Abu HaijaEmail author
  • Asma Eskhan
  • Fawzi Banat
Article

Abstract

The adsorption capacity of graphene for removing phenol from aqueous solutions was evaluated and compared to those obtained for three different commercial activated carbons. In this study, graphene, W-35 activated carbon, RB2H2 activated carbon, and Nuchar granular activated carbon were investigated. Various techniques such as X-ray diffraction, BET surface analysis, and scanning electron microscopy were used to characterize the adsorbents. The adsorption of phenol onto graphene was investigated under different experimental conditions including temperature, solution pH, adsorbent dosage, and initial concentration of phenol. For comparison, adsorption experiments of phenol onto the activated carbons were also conducted. The adsorption of phenol onto graphene and activated carbons could be described by the pseudo-second-order kinetic model and the Langmuir equilibrium isotherm. The maximum adsorption capacities predicted by the Langmuir isotherm for graphene, W-35, RB2H2, and Nuchar granular activated carbons were found to be 233, 200, 91, and 167 mg/g, respectively. The thermodynamic study demonstrated that the adsorption of phenol onto graphene and activated carbons is a spontaneous and exothermic process. Regeneration of graphene was found to be possible using sodium hydroxide or methanol as eluents over five adsorption-desorption cycles.

Keywords

Graphene Activated carbon Adsorbent Phenol Isotherms 

Notes

Acknowledgements

The authors are grateful to the Research Office at The Petroleum Institute, Abu Dhabi for funding project [no. 14513]. The contribution of Dr. Pal Priyabrata is appreciated.

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Dina Gaber
    • 1
  • Mohammad Abu Haija
    • 1
    Email author
  • Asma Eskhan
    • 2
  • Fawzi Banat
    • 2
  1. 1.Department of Chemistry, Petroleum InstituteKhalifa University of Science and TechnologyAbu DhabiUAE
  2. 2.Department of Chemical Engineering, Petroleum InstituteKhalifa University of Science and TechnologyAbu DhabiUAE

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