2022 Fiscal Year Final Research Report
Flux Crystal Growth and Functionalization of Five-Coordinate Layered Titanate K2Ti2O5
| Project/Area Number |
20K05074
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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 26020:Inorganic materials and properties-related
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| Research Institution | Shinshu University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | チタン酸塩 / イオン交換 / 選択吸着 / フラックス育成 |
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| Outline of Final Research Achievements |
Selectivity of ion exchangers is an important topic in adsorption science owing to its specific application in resource recovery and environmental remediation. In this study, the cation exchange property of the submillimeter sized five-coordinate K2Ti2O5 (KTO) crystals is demonstrated. Liquid exfoliation is a scalable and effective technique for preparing two-dimensional materials but suffers from several issues, including low yields and lack of control over the lateral size of the nanosheets. Herein, we report the flux-evaporation-assisted growth of millimeter-sized KTO single crystals and their liquid-phase hydrothermal exfoliation to form nanosheet colloids in water. X-ray absorption near edge structure (XANES) measurements of the KTO nanosheet colloid provide evidence that the KTO crystals undergo partial hydrolysis in water to generate hydroxyl groups on the surface, which weaken the interactions between the anionic frameworks and interlayer cations and accelerate exfoliation.
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| Free Research Field |
材料化学
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| Academic Significance and Societal Importance of the Research Achievements |
環境浄化・資源回収の観点から，選択的にイオンを吸着・分離する材料の必要性が高まっている。なかでも，無機イオン交換体は多様なナノ空間構造をもつため，イオン交換樹脂には見られない特異なイオン選択性をしばしば示す。今回、5配位チタン酸塩結晶の水和ナノ空間の局所構造が負の離液順列の起源であることを明らかにした。この知見は，新たな選択イオン交換体の設計につながると期待する
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