Linear solvation energy relationships. 33. An analysis of the factors that influence adsorption of organic compounds on activated carbon
✍ Scribed by Mortimer J. Kamlet; Ruth M. Doherty; Michael H. Abraham; Robert W. Taft
- Publisher
- Elsevier Science
- Year
- 1985
- Tongue
- English
- Weight
- 628 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0008-6223
No coin nor oath required. For personal study only.
✦ Synopsis
Adsorption coefficients on Pittsburgh CAL activated carbon, X & = lim -, (io c where X is the amount adsorbed on carbon (mgig) and C is the equilibrium concentration of the solute in aqueous solution (mgil) are correlated by the equation, log Z = -1.93 + 3.06V/ 100 + 0.56~* -3.2Op n = 37, r = 0.974. SD = 0.19, where E represents the infinite dilution partition coefficient between the adsorbed and solution phases, V is a measure of solute molar volume, and n* and p are the solvatochromic parameters that scale dipolarityipolarizabilities and hydrogen bond acceptor basicities of the adsorbates. Defining an adsorbate/adsorbent interaction index by A, = ZS,, . where S, is the molar solubility of the adsorbate in water, and combining the above equation with a correlation equation for log S,,. leads to the following equation which is independent of the nature of the second phase. log A, = -1.50 -0.15~/100 + 1.04~* + 2.06p n = 23, r = 0.887, SD = 0.1 I.
It is suggested that equations such as the above can serve to characterize the various types and grades of adsorbents.