Extraction of various metal ions by open-chain crown ether bridged diphosphates in supercritical carbon dioxide
| Autor: | Baogen Su, Qilong Ren, Qiwei Yang, Yiwen Yang, Di Duan, Zongbi Bao |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Alkaline earth metal Supercritical carbon dioxide General Chemical Engineering Metal ions in aqueous solution Inorganic chemistry Extraction (chemistry) Heavy metals 02 engineering and technology General Chemistry 010501 environmental sciences 01 natural sciences 020401 chemical engineering chemistry Chain (algebraic topology) 0204 chemical engineering Crown ether 0105 earth and related environmental sciences |
| Zdroj: | Pure and Applied Chemistry. 92:1683-1694 |
| ISSN: | 1365-3075 0033-4545 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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