Abstract
In ion–pair extraction system using a neutral complexation reagent and a counter anion, use of higher selective reagent is one of the most important factors to realize their mutual separation. In this study, we paid attention to Schiff base ligands synthesized from amines and carbonyl compounds, and systematically investigated the effects of ligand structure on extraction selectivity and extactability. From the obtained results, it was suggested that the ion recognition ability was able to be controlled by changing the ligand structure. Futhermore, complexing agents with very high selectivity to Cu2+ and Ni2+ were able to be synthesized. Studies on adsorption behavior of metal ions using mesoporous silicate MCM-41 were performed. It was found that metal ions such as Cd2+ and Pb2+ were adsorbed on MCM-41 as neutral acetylacetonato complexes by using acetylacetone as a chelating agent. Futhermore, by using the adsorption ability of organic molecules to MCM-41, adsorption behavior of metal ions with thenoyltrifluoroacetone supported on MCM-41 was investigated. As a result, it was found that Cu2+ and Zn2+ were adsorbed and MCM-41 was able to use as a support of high performance chelating agents.
