Intralanthanide Separation on Layered Titanium(IV) Organophosphate Materials via a Selective Transmetalation Process

Show full item record



Permalink

http://hdl.handle.net/10138/239651

Citation

Zhang , W , Hietala , S , Khryashchev , L , Hatanpää , T , Doshi , B & Koivula , R 2018 , ' Intralanthanide Separation on Layered Titanium(IV) Organophosphate Materials via a Selective Transmetalation Process ' , ACS Applied Materials & Interfaces , vol. 10 , no. 26 , pp. 22083-22093 . https://doi.org/10.1021/acsami.8b04480

Title: Intralanthanide Separation on Layered Titanium(IV) Organophosphate Materials via a Selective Transmetalation Process
Author: Zhang, Wenzhong; Hietala, Sami; Khryashchev, Leonid; Hatanpää, Timo; Doshi, Bhairavi; Koivula, Risto
Contributor: University of Helsinki, Department of Chemistry
University of Helsinki, Polymers
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
Date: 2018-07-04
Language: eng
Number of pages: 11
Belongs to series: ACS Applied Materials & Interfaces
ISSN: 1944-8244
URI: http://hdl.handle.net/10138/239651
Abstract: The lanthanides (Ln) are an essential part of many advanced technologies. Our societal transformation toward renewable energy drives their ever-growing demand. The similar chemical properties of the Ln pose fundamental difficulties in separating them from each other, yet high purity elements are crucial for specific applications. Here, we propose an intralanthanide separation method utilizing a group of titanium(IV) butyl phosphate coordination polymers as solid-phase extractants. These materials are characterized, and they contain layered structures directed by the hydrophobic interaction of the alkyl chains. The selective Ln uptake results from the transmetalation reaction (framework metal cation exchange), where the titanium(IV) serves as sacrificial coordination centers. The “tetrad effect” is observed from a dilute Ln3+ mixture. However, smaller Ln3+ ions are preferentially extracted in competitive binary separation models between adjacent Ln pairs. The intralanthanide ion-exchange selectivity arises synergistically from the coordination and steric strain preferences, both of which follow the reversed Ln contraction order. A one-step aqueous separation of neodymium (Nd) and dysprosium (Dy) is quantitatively achievable by simply controlling the solution pH in a batch mode, translating into a separation factor of greater than 2000 and 99.1% molar purity of Dy in the solid phase. Coordination polymers provide a versatile platform for further exploring selective Ln separation processes via the transmetalation process.
Subject: 116 Chemical sciences
titanium phosphate
ion exchange
lanthanide contraction
organophosphate ligand
solid-phase extraction
METAL-ORGANIC FRAMEWORKS
RARE-EARTH-ELEMENTS
FUNCTIONALIZED MESOPOROUS SILICA
ION-EXCHANGE MATERIALS
COORDINATION POLYMER
DI(2-ETHYLHEXYL)PHOSPHORIC ACID
LANTHANIDE SEPARATION
SOLVENT-EXTRACTION
HYBRID MATERIALS
PHOSPHORIC-ACID
Rights:


Files in this item

Total number of downloads: Loading...

Files Size Format View
Wenzhong_Article_IV.pdf 3.113Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record