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Received January 11, 2007
Accepted December 11, 2007
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Water adsorption in activated carbons with different burn-offs and its analysis using a cluster model
School of Chemical Engineering, Institute of Engineering, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand 1School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
Korean Journal of Chemical Engineering, July 2008, 25(4), 825-832(8), 10.1007/s11814-008-0137-8
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Abstract
This work presents the behavior of water adsorption in the activated carbons with different porous structure derived by varying the level of char burn-off. Water adsorption isotherms of activated carbons prepared from longan seed at three different burn-offs (19, 26 and 60%) were measured gravimetrically. These obtained carbons were different in terms of their pore size distribution and also the surface functional group properties by showing an increasing of total pore volume and the concentration of surface functional groups with increasing in the burn-off level. The water adsorption isotherms showed that the behavior and amount of water uptake could be divided into three consecutive ranges of relative pressure, 0.0-0.3, 0.3-0.7 and 0.7-0.94, corresponding to adsorption in ultramicropores, supermicropores, and mesopores, respectively. The isotherm data were simulated by a cluster model proposed by Do and Do. The correlation was found to be satisfactory over the entire range of relative pressure only with the lowest burn-off carbon which contained mainly micropores. For higher burn-off carbons, which showed increasing proportions of mesopores, the model needed to be modified by increasing the cluster size of the adsorbed water molecules from 5 to 20 for adsorption at relative pressures greater than about 0.7.
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Brennan JK, Bandosz TJ, Thomson KT, Gubbins KE, Colloids Surf. A: Physicochem. Eng. Asp., 187-188, 539 (2001)
Salame II, Bandosz TJ, Langmuir, 15(2), 587 (1999)
Dubinin MM, Serpinsky VV, Carbon, 19, 402 (1981)
Muller EA, Rull LF, Vega LF, Gubbins KE, J. Phys. Chem., 100(4), 1189 (1996)
Muller EA, Gubbins KE, Carbon, 36, 1433 (1998)
McCallum CL, Bandosz TJ, McGrother SC, Muller EA, Gubbins KE, Langmuir, 15(2), 533 (1999)
Birkett GR, Do DD, Mol. Phys., 104, 623 (2006)
Kaneko K, Hanzawa Y, Iiyama T, Kanda T, Suzuki T, Adsorption, 5, 7 (1999)
Ohba T, Kanoh H, Kaneko K, J. Am. Chem. Soc., 126(5), 1560 (2004)
Ohba T, Kanoh H, Kaneko K, J. Phys. Chem. B, 108(39), 14964 (2004)
Olivier JP, J. Porous Mat., 2, 9 (1995)
Boehm HP, Carbon, 40, 145 (2002)
Junpirom S, Do DD, Tangsathitkulchai C, Tangsathitkulchai M, Carbon, 43, 1936 (2005)
Bansal RC, Donnet JB, Stoeckli F, Active carbon, Marcel Dekker, New York (1988)
Miyawaki J, Kanda T, Kaneko K, Langmuir, 17(3), 664 (2001)
Rouquerol F, Rouquerol J, Sing K, Adsorption by powder and porous solids: Principles, methodology and applications, Academic Press, London (1999)
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Gregg SJ, Sing KSW, Adsorption, surface area and porosity, Academic Press, London (1982)
Kimura T, Kanoh H, Kanda T, Ohkubo T, Hattori Y, Higaonna Y, Denoyel R, Kaneko K, J. Phys. Chem. B, 108(37), 14043 (2004)
