Kinetics and Thermodynamics of Oleate Ion Adsorption on Fluorapatite and Dolomite
The kinetics and thermodynamics of oleate ion adsorption on the surface of fluorapatite and dolomite were studied by adopting TOC measurement and molecular simulation.The study on kinetics of adsorption shows that with HEDP as the depressant,the adsorption rate of oleate ions on fluorapatite is greater than on dolomite,and the adsorption on both minerals conforms to the quasi-second-order kinetic model.Furthermore,according to the study on adsorption thermodynamics,the characteristics of oleate ion adsorption on the inner pore surface of both fluorapatite and dolomite,on(001)surface of fluorapatite and(104)surface of dolomite nearly conform to Langmuir model.For identical specific surface area,the adsorption amount of oleate ions on dolomite is higher than that on fluorapatite,indicating that there are more active sites per unit surface area on dolomite than on fluorapatite.
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