Acta Phys. -Chim. Sin. ›› 1995, Vol. 11 ›› Issue (01): 15-19.doi: 10.3866/PKU.WHXB19950104

• ARTICLE • Previous Articles     Next Articles

The Adsorptions of FC-Surfactant and HC-Surfactant at Solid/Liquid Interface

Zhu Bu-Yao, Yang Bai-Qin   

  1. Peking University,Beijing 100871|Northwest Light Industry,Institute,Xianyang 712081
  • Received:1993-11-18 Revised:1994-01-13 Published:1995-01-15
  • Contact: Zhu Bu-Yao

Abstract:

The adsorptions of perfluorooctanoic acid, sodium pemuorooctanoate and sodium dodecylsulfate by hydrophobic silica gel have been investigated. The effects of temperature and ionic strength have also been investigated. Adsorption isotherms of S-type or LS-type have been obtained for all of the systems involved. The limiting adsorption of the two FC-surfactants are more than that for the HC-surfactant investigated. Among the FC-surfactants the acid shows stronger adsorbability than the sodium salt. The additions of electrolytes not only made the adsorptions larger, but sometimes even changed in type of the adsorption isotherm. Besides, the adsorptions always go down as temperature goes up. All of these experimental results can be explained well by the application of the two steps adsorption model and the general isotherm equation for adsorption of surfactant at solid-liquid interface.

Key words: FC-surfactant, HC-surfactant, Adsorption at S/L interface, Hydrophobic silica gel