氨基磺酸型两性表面活性剂在石英砂上的吸附热力学

在温度为298，318和338K下，采用静态法测定了水溶液中系列氨基磺酸盐两性表面活性剂在石英砂上等温吸附曲线。结果表明，吸附等温曲线可用Langmuir等温吸附公式描述；等温下，疏水效应对表面活性剂在石英砂上吸附过程起着决定性的贡献，是导致疏水基链长不同的表面活性剂在石英砂上吸附量不同的主要原因；焓变为负值时，吸附是放热过程，升温对吸附过程不利，导致吸附量降低。

Adsorption Thermodynamics of Sulfamate Amphoteric Surfactant on Quartz Sand

The isothermal adsorption curves of the aqueous solutions of sulfamate amphoteric surfactants on quartz sand were determined at 298 K, 318 K and 338 K with a static method. According to the results, the isothermal adsorption curves can be represented by Langmuir isothermal adsorption equation. At isothermal conditions, the hydrophobic effect determines the adsorption process of surfactants on quartz sand definitively and is the primary cause that the surfactants with the hydrophobic groups of different chain lengths have different adsorption capacities on quartz sand. Enthalpy becomes negative, and adsorption is an exothermic process, therefore temperature rise is disadvantageous to adsorption and reduces the adsorption capacity.