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

Graphene as an Efficient and Reusable Adsorbent Compared to Activated Carbons for the Removal of... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Water, Air, Soil Pollution Springer Journals

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

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Publisher
Springer International Publishing
Copyright
Copyright © 2017 by Springer International Publishing AG
Subject
Environment; Environment, general; Water Quality/Water Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Soil Science & Conservation; Hydrogeology; Climate Change/Climate Change Impacts
ISSN
0049-6979
eISSN
1573-2932
D.O.I.
10.1007/s11270-017-3499-x
Publisher site
See Article on Publisher Site

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.

Journal

Water, Air, Soil PollutionSpringer Journals

Published: Aug 12, 2017

References

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