2023 Fiscal Year Final Research Report
Establishment of rare earth collection and desorption / recovery technology using interfacial film of polyguanamine derivatives containing cyclic moiety
| Project/Area Number |
21K05180
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 35020:Polymer materials-related
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| Research Institution | Saitama University |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 金属捕集 / 金属の脱離回収 / 捕集選択性 / アザカリックスアレーン環 / ポリグアナミン / 界面分子膜 |
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| Outline of Final Research Achievements |
Using a polyguanamine derivative having an azacalixarene ring as cyclic moiety, we investigated the metal-trapping ability of its interfacial molecular films and the desorption/recovery technology for the trapped metals. Polyguanamine, which has a cyclic azacalixarene moiety in which two triazine rings and two phenyl rings are linked alternately, exhibited efficient metal scavenging behavior from a buffer solution as subphase containing metal cations. In this case, it was found that it was possible to trap the cadmium cation as toxic metals, the neodymium as the rare earth elements, the palladium as the rare metals, and even sodium, which has single charge when turned into a cation. And also, selective metal-trapping ability of this film was also shown depending on ionic radius and valence.
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| Free Research Field |
界面化学
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| Academic Significance and Societal Importance of the Research Achievements |
学術的な意義として，昨今の超分子化学の発展に寄与できる，多重水素結合性を示し分子組織を生み出すことが挙げられ，なおかつ，超分子組織に金属捕集性・脱離性・捕集選択性という機能を付与することができた．社会的な意義としては，我が国の南鳥島近郊に世界需要数百年分のレアアースが眠るという事実に対し，海中に潜む希少金属を水面上の高分子膜により捕集し，更に脱離回収可能であるという技術の確立が，今後のレアアース確保の持続可能性に繋がることが期待される．
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