The Adsorption of Water and Benzene on Amosite and Chrysotile Asbestos

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Abstract
In previous work the authors showed that chrysotile is more porous than amosite and consequently has a higher surface area. In the present work, water with a low molecular cross-section and benzene with a high molecular cross-section are used as adsorbates. Benzene adsorption is extremely slow on both adsorbents with each point taking from 4 to 24 hours for equilibration. Evidently, the larger benzene molecule has a more difficult time working its way through the small pores. The water isotherm on both asbestos minerals is typical Type II which shows that physical adsorption is predominant. In both cases hysteresis was found. Benzene adsorption on amosite resembled Type IV which reflects capillary condensation phenomena. With chrysotile some chemisorption may have occurred. BET surface areas and heats of adsorption are calculated.

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