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Title: Tailoring the Coordination Micro‐Environment in Nanotraps for Efficient Platinum/Palladium Separation

Journal Article · · Advanced Materials
ORCiD logo [1];  [1];  [1];  [2];  [3];  [3];  [3];  [4];  [4]; ORCiD logo [1]
  1. Department of Chemistry University of North Texas Denton TX 76201 USA
  2. Department of Materials Science &, Engineering University of Texas at Dallas Richardson TX 75080 USA
  3. Department of Chemistry Washington State University Pullman WA 99164 USA
  4. Department of Chemistry College of Science King Saud University Riyadh 11451 Saudi Arabia

Abstract Recovering platinum group metals from secondary resources is crucial to meet the growing demand for high‐tech applications. Various techniques are explored, and adsorption using porous materials has emerged as a promising technology due to its efficient performance and environmental beingness. However, the challenge lies in effectively recovering and separating individual platinum group metals (PGMs) given their similar chemical properties. Herein, a breakthrough approach is presented by sophisticatedly tailoring the coordination micro‐environment in a series of aminopyridine‐based porous organic polymers, which enables the creation of platinum‐specific nanotraps for efficient separation of binary PGMs (platinum/palladium). The newly synthesized POP‐ o 2NH 2 ‐Py demonstrates record uptakes and selectivity toward platinum over palladium, with the amino groups adjacent to the pyridine moieties being vital in improving platinum binding performance. Further breakthrough experiments underline its remarkable ability to separate platinum and palladium. Spectroscopic analysis reveals that POP‐ o 2NH 2 ‐Py offers a more favorable coordination fashion to platinum ions compared to palladium ions owing to the greater interaction between N and Pt 4+ and stronger intramolecular hydrogen bonding between the amino groups and four coordinating chlorines at platinum. These findings underscore the importance of fine‐tuning the coordination micro‐environment of nanotraps through subtle modifications that can greatly enhance the selectivity toward the desired metal ions.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; AC02-06CH11357
OSTI ID:
2345849
Journal Information:
Advanced Materials, Journal Name: Advanced Materials; ISSN 0935-9648
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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