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利用载波扫描法测量了汞、铅和镉在KCI,KBr,KI溶液界面上的微分电容曲线,以及1NKCI溶液中戊醇等十种典型有机表面活性物质在三种电极上的吸附行为.卤素离子在三种电极上的吸附活性,有着相同的顺序:Cl~-铅>镉. 我们发现,各种有机表面活性物质在三种电极上的脱峰电位之差既不等于零电荷电位之差,也不等于一个常数,而是当脱峰电位的值愈负时,脱峰电位之差就愈小.同一表面活性物质在三种电极上的吸附行为的差別,可能是由于被表面活性分子所排除的水分子在不同电极上的吸附功不同所引起的.
The differential capacitance curves of mercury, lead and cadmium at the interface of KCl, KBr and KI solutions were measured by carrier-wave scanning and the adsorption behavior of ten typical organic surface-active substances, such as amyl alcohol in 1NKCl solution, on three kinds of electrodes. The adsorption activities on the three electrodes are in the same order: Cl ~ -
lead> cadmium We found that the difference between the peak deactivation potentials of the various organic surface active substances on the three electrodes is neither equal to the difference of the zero charge potential nor to a constant value. The smaller the difference between the same surface active material adsorption behavior of the three electrodes may be due to surface molecules exclusion of water molecules on different electrodes caused by different adsorption work.
lead> cadmium We found that the difference between the peak deactivation potentials of the various organic surface active substances on the three electrodes is neither equal to the difference of the zero charge potential nor to a constant value. The smaller the difference between the same surface active material adsorption behavior of the three electrodes may be due to surface molecules exclusion of water molecules on different electrodes caused by different adsorption work.