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Extraction of various metal ions by open-chain crown ether bridged diphosphates in supercritical carbon dioxide

Authors
  • Duan, Di1, 2
  • Su, Baogen2
  • Bao, Zongbi2
  • Yang, Qiwei2
  • Yang, Yiwen2
  • Ren, Qilong2
  • 1 Department of Food and Biological Engineering, Guangdong Industry Technical College, China , (China)
  • 2 College of Chemical and Biological Engineering, Zhejiang University, China , (China)
Type
Published Article
Journal
Pure and Applied Chemistry
Publisher
Walter de Gruyter GmbH
Publication Date
Aug 21, 2020
Volume
92
Issue
10
Pages
1683–1694
Identifiers
DOI: 10.1515/pac-2019-1117
Source
De Gruyter
Keywords
License
Yellow

Abstract

Various toxic metal ions were successfully removed from solid matrix into supercritical CO2 (scCO2) by open-chain crown ether bridged diphosphates at 313.15 K and 20 MPa, these diphosphates with different ester side chains and different length of ethylene oxide bridge group are highly soluble in supercritical CO2. The extraction efficiency (E%) of heavy metals is between 55 and 89%. Mulliken charge distribution of ligand’s P=O coordination group was calculated to indicate the stability of metal complex. The ligand structure effects and the rationale for different selectivity were discussed. In addition, binding property of these diphosphates towards the alkaline earth metals was further studied following the same extraction procedures. Alkaline earth metal ions Ca2+, Sr2+ and Ba2+ were extracted with E% at 49–74%, 50–73% and 16–64%, respectively. DFT calculations were performed to investigate the interaction energy of the complexes and the correlation with the E% was discussed.

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