Abstract
For aromatic compounds, mono- and di- carboxylic acids and monohydric alcohols, the adsorption equilibria from their aqueous solutions onto a granular activated carbon were determined. Then, the equilibrium data were expressed by Freundlich type and the equilibrium constants k and n were obtained. The products k·n and the values of n for those organic compounds were correlated with the molar refraction Rm and the molecular volume Vm, respectively.
Then, the relationship between the products and Rm was shown, as follows.
log k·n=21.6 Rm+0.953-0.215 Nf (Nf : number of hydrophilic functional group)
The products for isomers of butanol could be corrected by use of that for the linear molecule as the standard one and the ratio of those boiling points TB/TB,0, and the effect of adsorption temperature on the products was estimated by comparing with the value at standard temperature T0, as follows.
k·n=(k·n)0 (TB/TB,0)4.2 and k·n=(k·n)0 (T0/T)
Also, the value of n was correlated with Vm and the effect of adsorption temperature on n was estimated, as follows.
log n=0.833 log Vm+3.72 and n=n0 (Vm/Vm,0)0.833 (T0/T)
where n0 and Vm,0 indicate n and Vm at standard temperature T0, respectively.
