Effect of pore blockage on adsorption isotherms and dynamics: anomalous adsorption of iodine on activated carbon

Bhatia, S. K. ; Liu, F. ; Arvind, G. (2000) Effect of pore blockage on adsorption isotherms and dynamics: anomalous adsorption of iodine on activated carbon Langmuir, 16 (8). pp. 4001-4008. ISSN 0743-7463

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Official URL: http://pubs.acs.org/doi/abs/10.1021/la991418h

Related URL: http://dx.doi.org/10.1021/la991418h

Abstract

Isotherm hysteresis and pore-blocking effects of trapped molecules on adsorption dynamics is studied here, using the iodine-carbon system in the 300-343 K temperature range. It is found that a portion of the iodine is strongly adsorbed, and does not desorb, even over very long time scales, while the remainder adsorbs reversibly as a homogeneous monolayer with a Langmuirian isotherm in mesopores. The strongly adsorbed iodine appears to adsorb in micropores and at the mesopore mouths, hindering uptake of the reversible iodine. The uptake data for the adsorption and desorption dynamics of the reversible part is found to be best explained by means of a pore mouth resistance control mechanism. It is concluded that the dynamics of the adsorption and desorption at the pore mouth is important at early stages of the process.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:2759
Deposited On:08 Oct 2010 11:10
Last Modified:17 May 2011 07:08

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