The effect of surface polarity and pore dimension on the adsorption of polar molecules on activated carbon cloth |
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| Affiliation: | 1. School of Chemical Engineering, University of Queensland, St. Lucia, Qld 4072, Australia;2. School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China;3. Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process of Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu 221006, China;1. Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China;2. Department of Chemistry, Taiyuan Institute of Technology, Taiyuan, 030008, China |
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| Abstract: | The adsorption of cyanogen chloride (CK) on carbon cloth activated to various degrees was studied. At intermediate activation time, maximum adsorbent-adsorbate interaction is manifested corresponding to a fit of the pore size to the dimension of the adsorbate molecule. Comparison of the maximum interaction effect of this highly polar molecule with that of nonpolar molecules and with water shows that, unlike the polar and hydrogen-bonding water molecule, only minute clustering occurs with CK at the pore size that corresponds to maximum interaction. Carbons enriched with surface oxygen groups bring about slightly smaller pore size of maximum interaction (PSMI), compared to oxygen-depleted carbon. The effect is attributed to greater dipoledipole interaction with the polar surface. The possibilities of optimizing adsorption isotherms and estimating the average ultramicropore size by utilizing the maximum interaction effect are discussed.It is stated that the pore size of maximum interaction provides an estimate of the average pore size of the molecular sieve carbon, which, quite probably, cannot be obtained otherwise, and the molecular sieving effect discussed in previous papers may serve to assess the pore constriction or aperture dimensions of the molecular sieve. |
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