Journal
CARBOHYDRATE POLYMERS
Volume 155, Issue -, Pages 345-353Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2016.08.047
Keywords
Graphene oxide; Aerogel; Adsorption; Methylene blue; Desorption
Categories
Funding
- Natural Science Foundation of Shandong Province [ZR2015EM038]
- Taishan Scholars Construction Engineering of Shandong province
- Startup Funding of Distinguished Professorship of 1000 Talents Program [31370084963067]
- Taishan Scholar Program [11370085961006]
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A novel three-dimensional (3D) agar/graphene oxide (AGO) composite aerogel was prepared by a vacuum freeze drying method. The AGO aerogel was tested for its adsorption capacity of methylene blue (MB) and was found to have a maximum adsorption capacity of 578 mg/g, as determined from the Langmuir isotherm. The adsorption kinetic studies revealed that adsorption followed pseudo-second-order model. The thermodynamic parameters calculated from the Van't Hoff equation indicate that the adsorption was an endothermic and spontaneous process. The adsorption mechanism may be attributed to electrostatic interaction between MB and AGO aerogel. Furthermore, the AGO aerogel can easily be recycled with a dilute NaOH solution wash, retaining over 91% of the adsorption capacity after recycling three times. (C) 2016 Elsevier Ltd. All rights reserved.
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