Preparation of ion-exchange resins containing macrocyclic host compounds with lipophilic-hydrophilic repulsion for critical metal separation

2015 Fiscal Year Final Research Report

• Project/Area Number: 25410192
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Green/Environmental chemistry
• Research Institution: Saga University
• Principal Investigator: OHTO Keisuke 佐賀大学, 工学(系)研究科(研究院), 教授 (70243996)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: レアメタル分離 / 大環状化合物 / 選択性 / 分離メカニズム

Outline of Final Research Achievements

Various types of trialkyl-monoacetic acid derivatives of calix[4]arene were prepared to investigate extraction property as extraction reagents, adsorption property as ion-exchange resins, and potential response property as ion-selective electrodes. Although lipophilic - hydrophilic repulsion was expected for lithium selectivity using trialkyl-monoacetic acid derivatives of calix[4]arene, result for 1H-NMR spectra showed that affinity for hydrogen bond between water molecules remaining in lithium ion and phenoxy oxygen atoms of calixarenes is related to selectivity. The extraction reagent-impregnated resin still exhibited lithium selectivity due to effect of hydrogen bond, while methylene crosslinked resin did not show lithium selectivity due to less hydrogen bond. The lithium selectivity was also observed using trialkyl-monoacetoamide derivatives of calix[4]arene, which is also attributed to hydrogen bond.

Free Research Field

分離工学（金属資源リサイクル）