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Enhanced separation of Pd(II) and Pt(IV) from hydrochloric acid aqueous solution using 2-((2-methoxyethyl)thio)-1H-benzimidazole

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Abstract

Separation of palladium (Pd) and platinum (Pt) by solvent extraction is difficult because of their extremely similar physicochemical properties. Development of new extractants with a high extraction efficiency and excellent separation selectivity is the primary focus for enhancing the separation of Pd and Pt by solvent extraction. In this study, a new extractant, 2-((2-methoxyethyl)thio)-1H-benzimidazole (MOBI), which contains N, S, and O atoms, was synthesized and used to separate Pd(II) and Pt(IV) from a hydrochloric acid aqueous solution. The experimental results revealed that Pd(II) and Pt(IV) were effectively separated under the optimal conditions: MOBI concentration of 0.005 mol·L−1, HCl concentration of 0.2 mol·L−1, organic/aqueous (O/A) phase ratio of 1.0, and contact time of 15 min. The separation coefficient between Pd(II) and Pt(IV) was 1246.40, which indicates that MOBI has a higher selectivity for Pd(II) than Pt(IV). In addition, the mechanism of coordination between Pd(II) and MOBI was demonstrated through the slope method, Fourier transform infrared spectroscopy (FTIR), hydrogen-1 nuclear magnetic resonance spectroscopy (1H NMR), and carbon-13 nuclear magnetic resonance spectroscopy (13C NMR). The results revealed that MOBI could coordinate with Pd(II) via the N atom in the benzimidazole ring of MOBI molecules to form [Pd(MOBI)2Cl2](O).

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (Nos. 51362012, 51662007, 51574213, and U1602273), the Yunnan Applied Basic Research Project (Nos. 2017FD157 and 2018FH001-049), and Yunnan Province Department of Education Fund (No. 2019J1183).

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Shao-Ping Feng & Kun Huang

  2. Department of Chemistry, College of Science, Honghe University, Mengzi, 661199, China

    Shao-Ping Feng

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  1. Shao-Ping Feng
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Correspondence to Kun Huang.

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Feng, SP., Huang, K. Enhanced separation of Pd(II) and Pt(IV) from hydrochloric acid aqueous solution using 2-((2-methoxyethyl)thio)-1H-benzimidazole. Rare Met. 39, 1473–1482 (2020). https://doi.org/10.1007/s12598-020-01545-8

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