Kinetic, Isotherm and Thermodynamic Studies for Removal of Methylene Blue Using β-Cyclodextrin/Activated Carbon Aerogels
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Abstract
A novel aerogel (β-CD/AC) was prepared through polymerization reaction of β-cyclodextrin (β-CD) with activated carbon (AC) and vacuum freeze drying method. The structure and morphology of β-CD/AC were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, Brunauer–Emmett–Teller (BET) method and thermogravimetric analysis (TGA). β-CD/AC is used to deal with wastewater containing methylene blue (MB) dye. The effects of AC content in β-CD/AC, pH value, temperature, contact time and amount of adsorbent on the adsorption of MB were studied in detail. The Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms. The Langmuir monolayer adsorption capacity of MB onto β-CD/AC was estimated as 166.67 mg/g. The kinetics of MB onto β-CD/AC was well described by the pseudo-second order model. The thermodynamic parameters indicated that the adsorption reaction of MB onto β-CD/AC was endothermic and spontaneous.
Keywords
Activated carbon β-Cyclodextrin Adsorption Methylene blueNotes
Acknowledgements
This work was supported by the National Natural Science Foundation of China (51672140), Natural Science Foundation of Shandong Province (ZR2015EM038), Taishan Scholar Program of Shandong Province (201511029).
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