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对月桂酸在不同温度下自十二烷溶液中在铁表面的等温吸附进行了实验研究。结果表明 :在 2 98～ 32 3K的温度范围内 ,恒温搅拌 4h就基本达到了吸附平衡。在 2 98K和 32 3K两种温度下的吸附等温线均属S型曲线 ,说明月桂酸在铁表面形成了表面反胶团或发生了合作吸附。用以两阶段吸附模型为基础的吸附等温线通用公式处理 2种温度下的吸附实验数据 ,结果表明实验值与拟合曲线有较好的一致性。热力学计算表明 :月桂酸在铁表面的缔合过程不是熵驱动的过程 ,故形成的表面缔合物是表面反胶团 ,其聚集数约为 3;极性基间的极性相互作用或氢键作用在表面反胶团形成过程中起主要作用。
The isothermal adsorption of lauric acid on iron surface from dodecane solution at different temperatures was studied. The results showed that the equilibrium of adsorption was basically reached at a constant temperature of 4h under the temperature range of 2 98 ~ 32 3K. The adsorption isotherms at 2 98K and 32 3K are S-shaped curves, indicating that lauric acid formed surface reverse micelle on the iron surface or cooperative adsorption occurred. Adsorption experimental data of two kinds of temperature were processed by the general formula of adsorption isotherm based on two-stage adsorption model. The results showed that the experimental values were in good agreement with the fitted curve. Thermodynamic calculations show that the association of lauric acid on the iron surface is not an entropy-driven process. Therefore, the surface association of the lauric acid is the reverse micelle on the surface, and its aggregation number is about 3; the polar interaction between polar groups or hydrogen The key role in the formation of the reverse micelle surface plays a major role.