硅胶自环己烷溶液中吸附苯、萘和菲的计量置换吸附模型

Stoichiometric Displacement Model for Adsorption of Benzene、Naphthalene and Phenanthrene by Silica Gel from Cyclohexane Solution

测定了硅胶自环己烷溶液中吸附苯、萘和菲的吸附等温线。用液-固吸附中的计量置换模型(SDM-A)处理实验结果。发现它们都能基本遵循SDM-A。还发现:苯和菲按SDM-A处理时,用lgPa～lgC-1表示的吸附等温线是‘V’形折线,其顶点正好是单分子层吸附和多分子层吸附(或另一种吸附状态)的分界点。只是菲的吸附量比苯大得多。萘的吸附等温线是分段线性的,按SDM-A得到的lgPa～lgC-1直线是分段的平行线,也存在与苯、菲类似的分界点。研究了吸附热力学,讨论了吸附机理。

The adsorption isotherm of benzene, naphthalene and phenanthrene from cyclohexane solution onto silica gel has been determined. Experimental data was computed by SDM-A. It was discovered that the adsorption obey SDM-A. It was discovered the adsorption isotherm of benzene and phenanthrene for lgPa lgC-1 on the basis of SDM-A is broken line of 'V' shape. The vertex of broken line is line of demarcation of monomolecular layer adsorption and multimolecular layer adsorption. But adsorption amount of phenanthrene is more than benzene. The adsorption isotherm of naphthalene is linear of divide section. Straight line of lgPa lgC-1 on the basis of SDM-A is parallel line of divide section. There is line of demarcation similar benzene. Thermodynamics in adsorption processes was studied. The mechanism of adsorption was discussed.