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测定了15℃和30℃时硅胶自环己烷中吸附苯甲醇、苯甲醚、苯甲醛和苯甲酸的吸附等温线,这些等温线皆可用Langmuir公式表示。利用Langmuir常数n_m~s和b值计算了吸附过程的△G~0、△H~0和△S~0;四种化合物的△S~0皆为正值。测定了在较大复盖度时红外光谱图上硅胶表面自由羟基峰的移动值△v_(OH)。结果表明△H~0和△v_(OH)及△v_(OH)~(1/2)间有线性关系。文中对所得结果做了初步的解释。
The adsorption isotherms of benzyl alcohol, anisole, benzaldehyde and benzoic acid adsorbed from cyclohexane at 15 ℃ and 30 ℃ were determined. These isotherms can all be expressed by Langmuir formula. △ G ~ 0, △ H ~ 0 and △ S ~ 0 of the adsorption process were calculated by Langmuir constants n_m ~ s and b; △ S ~ 0 of the four compounds were all positive values. The moving value △ v_ (OH) of free hydroxyl peak on the surface of silica gel on the infrared spectrum was measured at a larger coverage. The results show that there is a linear relationship between △ H ~ 0 and △ v_ (OH) and △ v_ (OH) ~ (1/2). The article made a preliminary explanation of the results obtained.