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Liu M, Du Y, Liu Y, Li X, Yang S, Feng J, Huang Z, Chen Y, Wang B, Chen R. Rapid separation of the low concentration Pd from Pd-Pt coexisting systems: Cyano-group's monomer-specific affinity. J Colloid Interface Sci 2024; 665:422-429. [PMID: 38365516 DOI: 10.1016/j.jcis.2024.02.105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Revised: 02/08/2024] [Accepted: 02/12/2024] [Indexed: 02/18/2024]
Abstract
Rapid separation of low concentration palladium (Pd) from Pd-Platinum (Pt) coexisting systems remains a formidable challenge, primarily due to the undifferentiated substitution of ligands in Pd/Pt complexes by adsorption sites. The development of an adsorbent featuring monomer-specific affinity adsorption sites for Pd/Pt could mitigate this drawback. Herein, Manganese hexacyanoferrate (MnHCF) possessing the sensitivity and specificity to Pd ions (Pd(II)) was synthesized via the facile co-precipitation method. MnHCF could rapidly and selectively capture 90.30 % of Pd(II) from a 10 ppm Pd-Pt coexisting system within just 5 min. Spectroscopic analyses and density functional theory (DFT) calculations indicated that cyano-group (CN) in MnHCF exhibited the monomer-specific affinity for targeted capturing Pd via the direct and strong coordination interaction (Fe-CN-PdCl2), which was co-determined by the electron-losing of C (0.06 e) and N (0.07 e) atom. At the same time, CN could neither react directly with the fully coordinated [PtCl6]2- species nor substitute the Cl- ligand, both of which contributed to the non-adsorption of Pt, thus triggering the Pd-Pt separation. This study provides a promising candidate adsorbent for practical applications in platinum group metals recovery by the design of adsorption sites with monomer-specific affinity.
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Affiliation(s)
- Meng Liu
- Yanshan Earth Critical Zone and Surface Fluxes Research Station, University of Chinese Academy of Sciences, Beijing 100049, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yuxuan Du
- Yanshan Earth Critical Zone and Surface Fluxes Research Station, University of Chinese Academy of Sciences, Beijing 100049, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yu Liu
- Yanshan Earth Critical Zone and Surface Fluxes Research Station, University of Chinese Academy of Sciences, Beijing 100049, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaoping Li
- Yanshan Earth Critical Zone and Surface Fluxes Research Station, University of Chinese Academy of Sciences, Beijing 100049, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shengjiong Yang
- Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Xi'an, Shanxi 710055, China
| | - Jinpeng Feng
- School of Resources, Environment and Materials, Guangxi University, Nanning, Guangxi 530004, China
| | - Zonghan Huang
- Yanshan Earth Critical Zone and Surface Fluxes Research Station, University of Chinese Academy of Sciences, Beijing 100049, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yang Chen
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Bo Wang
- Chinese Academy of Environmental Planning, Beijing 100041, China.
| | - Rongzhi Chen
- Yanshan Earth Critical Zone and Surface Fluxes Research Station, University of Chinese Academy of Sciences, Beijing 100049, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
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