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Received September 27, 2014
Accepted October 20, 2014
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Adsorption behavior of phenanthrene onto coal-based activated carbon prepared by microwave activation
School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, P. R. China 1Dipartimento di Scienza e Tecnologia del Farmaco, University of Turin, Torino 10125, Italy
wuzhans@126.com
Korean Journal of Chemical Engineering, June 2015, 32(6), 1129-1136(8), 10.1007/s11814-014-0317-7
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Abstract
Coal-based activated carbon (CAC) was prepared from coal produced in Xinjiang of China by microwave activation. CAC was characterized and used as an adsorbent for phenanthrene adsorption. The effects of temperature, adsorption time, CAC amount, initial concentration and pH value of solution on phenanthrene adsorption were studied. The adsorption rate of phenanthrene onto CAC was obtained nearly 100% with initial concentration of 100 mg/L and CAC dosage of 0.3 g at 25 oC. Phenanthrene adsorption was well described with the Langmuir isotherm. The pseudosecond-order model was found to more effectively explain the adsorption kinetics of phenanthrene. The lower temperature was favorable to the adsorption rate and equilibrium adsorption capacity of phenanthrene onto CAC. The thermodynamic parameters ΔHθ, ΔSθ and ΔGθ computed for phenanthrene adsorption onto CAC demonstrate the process was spontaneous, radiative, and entropically driven. Thus, CAC prepared by microwave activation could be effective for removing phenanthrene.
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References
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