Abstract
The adsorption characteristics of low-molecular-weight organic compounds dissolved in water on hydrogenated activated carbon fibre (ACF) have been measured in terms of the amount adsorbed, the heat of immersion, and the heat of adsorption. The adsorption isotherms of the organics were found to conform to the Freundlich equation. The amounts of adsorbed polar compounds were increased by using ACF treated with hydrogen gas, which suggests that ACF has a relatively high hydrophobicity. The average electrostatic field strength increased as the number of functional groups on the ACF surface increased. The heats of adsorption decreased with increasing average electrostatic field strength. It was found that removing the polar functional groups attracting water molecules on the ACF surface resulted in an increase in the degree of adsorption of the low-molecular-weight organics from aqueous solution.
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