电化学方法研究脱脂乳在金电极表面的吸附

The adsorption of skimmed milk at Au electrode by electrochemical method

本文研究脱脂乳在金电极表面的吸附,并探讨脱脂乳的变化对吸附的影响。以微分电容法研究脱脂乳在金电极表面的吸附,并用循环伏安法和交流阻抗表征电极吸附,采用石英晶体微天平研究不同脱脂乳在金电极表面的界面吸附。结果表明:在一定浓度范围内,脱脂乳在金电极表面吸附是单分子层吸附,符合Langmuir吸附等温方程式;随着脱脂乳浓度的增加,脱脂乳在金晶体表面逐步达到饱和吸附;在不同p H缓冲溶液的吸附量也不同,在p H为5时吸附量最大;在同一稀释浓度及p H条件下,吸附量随着掺杂离子强度的增加呈现先增大后减小的规律。

In the study,the adsorption of skimmed milk at Au electrode was nvestigated.Differential capacitance were used to study skimmed milk of different concentrations dispersion adsorption property on the surface of Au electrode, the adsorption behavior of milk on the Au electrode was characterized by cyclic vohammetry and electrochemical impedance spectroscopy.The adsorption behavior of different skimmed milk dispersion on gold mystal surface were researched by QCM.The results showed that within a certain concentration range, skimmed milk dispersion was monomolecular layer adsorption on the surface of the Au electrodes and in line with the Langmuir adsorption isotherm equation.Skimmed milk on the adsorption of gold crystal surface gradually reached saturation with the increasing skinnned milk concentration. In different pH buffer solutions, the adsorption quantity of milk on gold crystal surface was different, with the maximum adsorption in the pH of 5. At the same concentration and pH,adsorption capacity increased firstly and then decreased with the increase of ionic strength.