吸附分子结构单元与溶液吸附常数的关系

Correlation between the Structure of Adsorbed Molecules and the Adsorption Constants from Solution

本工作利用硅胶自环己烷中吸附醇、酮、酯,活性炭自环己烷中吸附芳香化合物的实验结果计算证明,这些化合物吸附的Henry常数K(K=_m^s·b)可看作是构成这些分子的各结构单元贡献的总和,即lnK—ln(n_m^s·b)=∑n_iln(n_m^s·b)_i,式中n_m^s为Lanmuir等温式中极限吸附量,b为与吸附热有关的常数,n_i为构成分子的i结构单元的数目,(n_m^s·b)_i为i结构单元的Henry常数.这一结果给出了在一定条件下预示吸附等温线的可能性.

The calculated results from the adsorption data of the alcohols, ketones and esters on the silica gel and of the aromatic compounds on the active carbon from cyclohexane show, that each functional group can be assumed to make its own cantribution to Henry coefficient K(K=nms ·b), i.e. InK=In(nms ·b)=∑niIn(nms ddddddd b)i, where nms is limiting adsorption, b is the adsorption coefficient, ni is the number of functional group in a molecule, (nms·b)i is Henry coefficient of functional group i. The additive scheme can be used for determination of adsorption isotherms in the same conditions on the basis of contributions to the Henry coefficient of individual functional group and the number of groups in a molecule.