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采用亲水性/疏水性离子液体通过溶剂萃取-直接电沉积法从盐酸介质中回收钯(II) 。

Recovery of Pd(II) from Hydrochloric Acid Medium by Solvent Extraction-Direct Electrodeposition Using Hydrophilic/Hydrophobic ILs.

作者信息

Shao Min, Li Shunling, Jin Ci, Chen Muhan, Huang Zhangjie

机构信息

Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University), Ministry Education, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan Province 650091, China.

出版信息

ACS Omega. 2020 Oct 14;5(42):27188-27196. doi: 10.1021/acsomega.0c03255. eCollection 2020 Oct 27.

DOI:10.1021/acsomega.0c03255
PMID:33134679
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7594130/
Abstract

Mixed [Cbet]Br/[Cmim][NTf] ionic liquids were used as a new extraction system to extract Pd(II) from multimetal-ion solutions. The separation factors (M: Cu, Fe, Ni, Zn, Co) are greater than 10. Thiourea was found to be an effective stripping agent. After three cycles, the recovery efficiency was higher than 91.0%. Direct electrodeposition of palladium from the mixed ionic liquid phase was also studied. The Pd(II) complex in [Cbet]Br/[Cmim][NTf] system was studied by cyclic voltammetry at 348 K. The results indicate the existence of three types of Pd(II) complex in the [Cbet]Br/[Cmim][NTf] system, leading to three reductive waves. The reduction of Pd(II) to Pd(0) in this system is irreversible. A uniform black coating was obtained by constant-potential deposition at -1.7 V on a nickel foil, confirmed to be palladium metal by energy-dispersive spectrometry, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy analyses. After three cycles of continuous extraction-electrodeposition, over 90.0% of palladium was recovered.

摘要

混合的[Cbet]Br/[Cmim][NTf]离子液体被用作一种新的萃取体系，用于从多金属离子溶液中萃取钯(II)。分离因子（M：Cu、Fe、Ni、Zn、Co）大于10。发现硫脲是一种有效的反萃剂。经过三个循环后，回收效率高于91.0%。还研究了从混合离子液体相中直接电沉积钯。在348 K下通过循环伏安法研究了[Cbet]Br/[Cmim][NTf]体系中的钯(II)配合物。结果表明，[Cbet]Br/[Cmim][NTf]体系中存在三种类型的钯(II)配合物，导致出现三个还原波。该体系中钯(II)还原为钯(0)是不可逆的。通过在镍箔上-1.7 V恒电位沉积获得了均匀的黑色涂层，通过能量色散光谱、X射线光电子能谱和高分辨率透射电子显微镜分析证实为钯金属。经过三个连续萃取-电沉积循环后，钯的回收率超过90.0%。

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