THE S-TYPE ISOTHERM EQUATION FOR ADSORPTION OF NONIONIC SURFACTANTS AT THE SILICA-GEL WATER INTERFACE

被引：95

作者：

GU, TR

ZHU, BY

机构：

[1] Laboratory of Surface and Colloid Chemistry, Department of Chemistry, Peking University, Beijing

来源：

COLLOIDS AND SURFACES | 1990年 / 44卷

关键词：

D O I：

10.1016/0166-6622(90)80189-B

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Generally the adsorption of nonionic surfactants from aqueous solution onto polar adsorbents (e.g., silica gel) exhibits an S-type curve. In this work, based on the consideration of hemimicelle formation, the mass-action model has been extended to nonionic surfactant adsorption systems. The S-type adsorption isotherm equation has been derived and this makes possible the calculation of the hemimicelle aggregation number (n), equilibrium constant (K) and the standard free energy of hemimicellization (ΔhmGo) from the experimental data. The previous adsorption data of three nonionic surfactants (i.e., octylmethylsulfoxide, decylmethylsulfoxide and Triton X-100) on two silica gels with different porosities have been used to test the model. The results show that the S-type isotherm equation and the mass-action model agree with the experimental data very well. © 1990.

引用

页码：81 / 87

页数：7

共 16 条

[1] STREAMING POTENTIAL STUDIES ON QUARTZ IN SOLUTIONS OF AMINIUM ACETATES IN RELATION TO THE FORMATION OF HEMIMICELLES AT THE QUARTZ-SOLUTION INTERFACE [J].