Recovery of Iridium by Solvent Extraction and Direct Electrodeposition Using Phosphonium-Based Ionic Liquids

Recovery of Iridium by Solvent Extraction and Direct Electrodeposition Using Phosphonium-Based Ionic Liquids
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鏻基离子液体溶剂萃取和直接电沉积回收铱

DOI:
10.1149/1945-7111/abfb34
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发表时间:
2021
影响因子:
3.9
通讯作者:
Sasaki Yuji
Sasaki Yuji
中科院分区:
工程技术4区
文献类型:
--
作者:
Matsumiya Masahiko;Kinoshita Ryoma;Tsuchida Yusuke;Sasaki Yuji

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用胺类萃取剂研究了Ir (IV)在磷基离子液体(IL)体系三乙基-n-戊基磷酸二(三氟甲基磺酰基)酰胺([p2225][NTf 2])中的萃取行为。此外,研究了电沉积过程中提取的Ir (IV)在[p2225][NTf 2]中的电化学行为。基于伏安法的电化学分析表明,Ir (IV)的还原是通过中间Ir (III)进行的,即Ir (IV)+ e−→Ir (III)和Ir (III)+ 3e−→Ir(0)两个步骤。在298 ~ 373 K的温度范围内,用半积分和半微分分析方法测定了提取的Ir (IV)在IL中的扩散系数,结果表明,两种分析方法的结果基本一致。此外,在IL浴中连续进行了10个循环的溶剂萃取和电沉积Ir金属。从XPS得到的4f 7/2光谱可以看出,整个Ir电镀层处于金属态。
The extraction behavior of Ir (IV) in a phosphonium-based ionic liquid (IL) system, triethyl-n-pentyl phosphonium bis (trifluoromethyl-sulfonyl) amide ([P 2225][NTf 2]), was investigated using an amine extractant. In addition, the electrochemical behavior of the extracted Ir (IV) species in [P 2225][NTf 2] during electrodeposition was studied. Voltammetry-based electrochemical analysis revealed that the reduction of Ir (IV) proceeded via an intermediate Ir (III) species in two steps, namely, Ir (IV)+ e−→ Ir (III) and Ir (III)+ 3e−→ Ir (0). Diffusion coefficients of the extracted Ir (IV) species in the IL were determined over the temperature range of 298–373 K using semi-integral and semi-differential analyses, and values obtained from the two analyses were consistent with each other. Furthermore, consecutive solvent extraction and electrodeposition of Ir metal in the IL bath were performed for 10 cycles. The entire Ir electrodeposit was in the metallic state, as is evident from the 4f 7/2 spectrum obtained by XPS.
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