科研之友
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摘要
A new aspect of liquid-liquid extraction by using the adsorption isotherm approach at divided interface was described. In order to explain complexation behavior of ligands, extraction of ions in the interfacial region of liquid-liquid phase can be modeled by Langmuir adsorption isotherm. A series of macrocycles of different ring sizes with different type of donor atoms has been synthesized and characterized by several spectroscopic techniques. Solvent extraction method was used to evaluate metal-ion binding properties of the macrocycles. The values of the extraction constants and the complex compositions were determined for the extracted complexes. Macrocycles 2 and 3 as extractant of silver cation from aqueous solution at different temperatures and concentrations was investigated. Kinetics and thermodynamic parameters of the interfacial adsorption were also investigated. The cation-binding affinity of macrocyclic ligand 2 among the other ligands for Ag+ over other cations in both organic solvents was found to be the highest. The Ag+ ion was extracted by 88.3 and 81.7% to the dichloromethane and chloroform phase with macrocycle 2, respectively. The maximum metal ion adsorption capacity (28%) was found for macrocycle 2 at 20 degrees C.
- 出版日期2015-2
