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Selective extraction of Pd(II) with a thiourea-introduced ionic liquid

チオ尿素導入イオン液体による選択的なPd(II)の抽出

菊池 圭; 上田 祐生   

Kikuchi, Kei; Ueda, Yuki

パラジウム(Pd)の一次資源量は少なく、産出地には偏りがある。Pdはその優れた水素吸蔵能力から、燃料電池自動車などの需要増加に伴い、高選択的な分離剤の必要性が高まっている。そこで、本研究ではPdの高効率分離のために、イオン液体(IL)の荷電化学種が抽出可能である性質、及び化学修飾により機能化できる性質に着目し、新規チオ尿素導入イオン液体を合成した。この新規ILによるPdの抽出特性を検討した結果、新規ILは比較的高い酸濃度条件において、市販抽出剤よりも高いPd抽出能力を有していた。抽出スロープ解析と、広域X線吸収微細構造により、詳細な抽出機構を決定した。

The production sites of the palladium (Pd) primary resources are located specific areas and its amount are limited. The social demands for Pd have been increased with increasing the social demand for fuel cells because Pd has an excellent hydrogen storage capacity. Therefore, the development of the novel separating reagents for Pd is required. In this study, the novel thiourea-introduced ionic liquid was synthesized and its extraction ability of Pd was evaluated from a viewpoint the effective recovery of Pd. Ionic liquids (ILs) are salts with the melting points below 373 K. ILs have attracted substantial interest as a green alternative solvent due to their non-volatile and non-flammable properties. From the Pd extraction study, the novel IL has highly Pd extraction ability from relatively high acidic solutions. Slope analysis and extended X-ray absorption fine structure spectroscopy of the extracted complex of Pd was carried out to determine the detail extraction mechanism.

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