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研究了活性炭自二氯甲烷、乙醚、溴仿和正戊醇四种单纯溶剂和体积比为1:1的各种二元混合溶剂中对苯甲酰胺的吸附。自单纯溶剂中吸附时,其次序是:乙醚>正戊醇≌二氯甲烷>溴仿。自正戊醇-二氯甲烷或正戊醇-乙醚的混合溶剂中吸附时,苯甲酰胺的吸附量并不介于自组成混合溶剂的两种单纯溶剂中吸附的吸附量之间,而较之更低。本文根据活性炭表面覆盖有极性不同的基团提出了一种解释。将吸附等温线外延到饱和浓度时,其吸附量只相当于活性炭孔体积的10～30％。这意味着将Polanyi吸附势理论应用于自有机溶剂中的吸附时存在困难。此外,自戊醇-二氯甲烷中吸附苯甲酰胺时的等温线甚至低于自戊醇-溴仿中吸附时的。这一现象尚未得到解释。
Adsorption of benzamide from various binary solvents such as dichloromethane, diethyl ether, bromoform and n-pentanol, and various binary mixed solvents with a volume ratio of 1: 1 was studied. When adsorbed from a simple solvent, the order is: ether> n-pentanol ≌ dichloromethane> bromoform. When adsorbed from a mixed solvent of n-amyl alcohol-methylene chloride or n-amyl alcohol-diethyl ether, the amount of benzamide adsorbed was not in the range of the amount of adsorption between two pure solvents constituting a mixed solvent, Lower. This paper presents an explanation based on the fact that activated carbon surfaces are covered with groups of different polarities. When the adsorption isotherm is extended to the saturated concentration, the adsorption amount is only 10 to 30% of the pore volume of the activated carbon. This means that there is difficulty in applying the Polanyi adsorption potential theory to adsorption from organic solvents. In addition, the isotherm at which benzamides are adsorbed from amyl alcohol-methylene chloride is even lower than when adsorbed from amyl alcohol-bromoform. This phenomenon has not yet been explained.