A STUDY OF ADSORPTION OF IODINE AND ACETIC ACID FROM AQUEOUS SOLUTIONS ON CHARACTERIZED POROUS CARBONS

The iodine/iodide/water and acetic acid/water systems have been used to study adsorption by characterized activated polyvinylidene chloride carbons and an activated coconut charcoal. The adsorbents were characterized in terms of micropore volume and effective surface area as provided by the Dubinin theory of adsorption. It was found that iodine adsorption is not restricted to monolayer coverage and that filling of transitional porosity occurred. The correct isotherm must employ free iodine concentration and not total iodine concentration. The effect of iodide concentration upon extent of iodine adsorption can then be predicted. Radioactive iodine studies suggest that the adsorbed species is I2 and not ionic species. Acetic acid adsorption cannot be used realistically to measure surface areas or internal pore volumes. © 1968.