Application of Site-binding Modeling to Oil Droplets in Aqueous Solutions
Surfactant plays a critical role in many industrial processes such as petroleum, mining, environment and food processing, and daily life. For ionic surfactant systems, adsorption of surfactant at oil-water interface imposes a net charge to the interface. The nature and magnitude of the charges at the oil-water interface depend on charge characteristics of suffactant molecules, concentration of surfactant and solution pH. In our previous study, zeta potential measurement of hexadecane droplets in industrial process water was shown to be a simple, yet powerful method for identifying various types of ionic surfactants present in the aqueous system. In this paper, the site-binding model was applied to prediction of zeta potential of oil droplets in aqueous solutions containing a mixture of cationic and anionic surfactant molecules. The total number of interracial sites for various types of surfactant involved was determined by applying the Gibbs adsorption equation to the measured interfacial tension-surfactant concentration profiles. The distribution of various types of surfactant molecules at the interfaces was evaluated by Langmuir isotherm constants. With the ionization constant of surfaetant taken from the literature, the predicted zeta potentials of oil droplets in surfactant solutions from site binding model were shown in a reasonable agreement with the measured zeta potential values.
Site-binding model Zeta potential Hexane/water interface Flotation
J. J. Liu L. Y. Zhang P. Breen Z. Xu J. Masliyah
Nalco Company, USA Baker Petrolite Corp. Edmonton, Canada
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
924-932
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）