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测定了25℃和40℃时活性自环已烷中吸附苯甲酸、水杨酸、苯酚、萘和α—萘酚的吸附等温线,用Lagmuir吸附参数计算了吸附过程的标准热力学函数△G°、△H°和△S°。结果表明,苯酚、萘和α—萘酚的△G°相近,苯甲酸的△G°比水相酸的大。苯甲酸的△S°为大的正值,水杨酸的△S°为不大的正值,苯酚的△S°近于零;而萘和α—萘酚△S°为大的负值。认为,在溶液吸附中有的体系熵效应则可能是吸附过程的主要推动力。
The adsorption isotherms of benzoic acid, salicylic acid, phenol, naphthalene and α-naphthol adsorbed from cyclohexane at 25 ℃ and 40 ℃ were measured. The standard thermodynamic function △ G ° , △ H ° and △ S °. The results showed that the △ G ° of phenol, naphthalene and α-naphthol were similar, and the △ G ° of benzoic acid was larger than that of aqueous acid. Benzoic acid △ S ° is a large positive value, △ S ° of salicylic acid is not large positive value, phenol △ S ° is close to zero; and naphthalene and α-naphthol △ S ° is a large negative value . It is believed that the entropy effect of some systems in solution adsorption may be the main driving force of the adsorption process.