2022 Fiscal Year Final Research Report
Template-strategy of atomic arrangement in layered double hydroxides
Project/Area Number |
21K14404
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Research Category |
Grant-in-Aid for Early-Career Scientists
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Allocation Type | Multi-year Fund |
Review Section |
Basic Section 26020:Inorganic materials and properties-related
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Research Institution | The University of Tokyo (2022) Shinshu University (2021) |
Principal Investigator |
Sudare Tomohito 東京大学, 大学院理学系研究科(理学部), 特任助教 (40783923)
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Project Period (FY) |
2021-04-01 – 2023-03-31
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Keywords | トポケミカル反応 / 層状複水酸化物 / 硝酸イオン |
Outline of Final Research Achievements |
We aimed to fabricate layered double hydroxides (LDHs) with novel atomic arrangements. Through the establishment of a method for controlling the atomic arrangement of LDHs based on topochemical reactions, and evaluation of the performance of ion adsorption and elucidation of the adsorption mechanism, we aimed to obtain a guiding principle for the selective adsorption and separation of ions by inorganic adsorbents. As a result, it was found that the LDHs synthesized by topochemical reactions have a solid solution composition that exceeds the conventional solid solution limit and a high symmetry atomic arrangement. Furthermore, these LDHs showed high fluoride ion selectivity and high adsorption capacity for nitrate ions, indicating for the first time that atomic arrangement, i.e., the geometry of adsorption sites, is the key to the adsorption separation of ions.
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Free Research Field |
無機固体化学
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Academic Significance and Societal Importance of the Research Achievements |
反応性窒素の人為活動による生産量は年々増加している。特に、施肥や産業、生活によって生成され、環境中の水への排出される硝酸イオンの量は、化石燃料の消費による放出量や農地による固定量をはるかに上回っており、窒素の地球科学的循環に向けた選択的な分離・濃縮技術が求められている。分子科学の観点でも、平面分子内に電荷共鳴構造をもつため、電荷密度や求核性が極めて小さく、一般に、物質との相互作用が小さい。そのため、吸着材による水中からの分離が極めて難しい。それに対して、今回開発したLDHsは極めて高い硝酸イオン吸着能をもつため、環境問題の解決に資するのみでなく、吸着科学の学理構築に資するものである。
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