Preparation of acidity-tuned amido compounds with electron-withdrawing halogen atoms and precious metal extraction

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K12399
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 64030:Environmental materials and recycle technology-related
• Research Institution: Saga University
• Principal Investigator: OHTO Keisuke 佐賀大学, 理工学部, 教授 (70243996)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 金属リサイクル / アニオン抽出 / 抽出試薬開発 / ハロゲン化アミド化合物

Outline of Final Research Achievements

Secondary amido compounds have been focused as new type of extraction reagents for metal anions. New secondary amido compounds with electron-withdrawing halogen atoms have been prepared to control delta+ nature of amido hydrogen atom and to investigate whether amido hydrogen atom can contribute to extract anionic species without any participation of protonated carbonyl oxygen atoms. As results of extraction of Ga and Pt in chloride media, the contribution of amido hydrogen atom for anion extraction was confirmed by spectroscopic and extraction studies. The anion extraction was affected with tuned amido compounds by changing a kind and number of halogen atoms. It was also found that distance between two amido hydrogen atoms affected the efficiency of anion extraction.

Free Research Field

ｋｋ

Academic Significance and Societal Importance of the Research Achievements

金属資源に乏しく先端産業の盛んな日本にとって金属資源確保は重要であり、都市鉱山に関心が高まっているが、微量かつ数多くの金属資源があり、選択的に個々の金属を回収することは困難である。乾式や湿式の多くの技術が利用されているが容易ではない。本研究は湿式技術のうち、溶媒抽出試薬、特にガリウムや貴金属のようなアニオン種の新たな分離試薬として、２級アミドの水素原子に着目した。弱い相互作用を分子設計概念に組み込むことで、従来法では困難であった分離が見直される。また、有害元素の除去など、他のアニオン種への適用を可能であり、都市鉱山の有効活用に利用できる試薬開発となり得るため、社会的意義は大きい。