XPS法研究表面活性剂、碱和聚合物在固体颗粒表面吸附的协同效应

利用光电子能谱法(XPS)研究了表面活性剂、碱和聚合物在固体颗粒表面上的吸附量及相互之间的协同效应。表面活性剂和碱在S iO2固体颗粒上的最大吸附量随着浓度的增大而增加,分别在1 200,5 000 mg/L达到最大吸附量1.15 mg/g和1.65 mg/g,吸附量达到最大值后趋于稳定;聚合物的平衡吸附曲线随着浓度的增大吸附量先增加后减少,600 mg/L达到最大吸附量1.30 mg/g,后减小至0.40 mg/g基本不变;在表面活性剂、碱和聚合物复合吸附体系中,碱的存在大大降低了表面活性剂在固体表面上的吸附量,在一定程度上增加了聚合物在固体表面上的吸附量,聚合物和表面活性剂在共存竞争吸附影响下S iO2表面上的吸附量都有了较大的减少;在表面活性剂、碱和聚合物复合体系中,聚合物与碱协同吸附的固体表面吸附层比其它情况下厚。

Study of the adsorption of surfactant,polymer and alkali on the surface of solid particle by XPS

In view of the adsorption of surfactants,polymer and alkali on the surface of SiO2 solid particle,determines the type and the content relations of the elements adsorbed on the solid particle surface through the X-ray photoelectron spectroscopy.The adsorbance of surfactant and alkali onto SiO2 solid particles increase and reach the maximum with the increasing of the concentration,the maximum adsorbance of surfactant and alkali are 1.15 mg/g,1.65 mg/g at the concentration of 1 200 mg/L and 5 000 mg/L;the adsorption isotherm for polymer first increases,then decreases,maximum adsorbance reach 1.30 mg/g at the concentration of 600 mg/L,and then decreased to 0.40 mg/g and remain basically unchanged;the alkali greatly reduces the adsorbance of surfactants and increases the adsorbance of polymer to a certain extent in the composite absorption system;polymer and alkali coordinated adsorption layer is much thicker than in other cases.