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20250722232512.0 |
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250722s2025 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.5c02186
|2 doi
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|a pubmed25n1504.xml
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Chen, Yanjun
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Amino Acid Ionic Liquid Two-Phase System
|b Construction and Its Application for Green Gold Recovery from E-waste Thiosulfate Leachate
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|c 2025
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Revised 22.07.2025
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Although gold extraction from electronic waste using thiosulfate is a highly promising approach, the recovery of gold from thiosulfate leaching solutions still poses a significant challenge. To enable more environmentally friendly gold recycling, aqueous two-phase systems (ATPSs) composed of guanidinium amino acid ionic liquids (TMG-AA ILs) and phosphates were developed for extracting gold from thiosulfate-leached solutions of electronic waste. Key parameters affecting Au(I) extraction were systematically investigated, including the types and concentrations of TMG-AA ILs and inorganic salts, initial gold concentration, temperature, and reaction time. The findings indicate that the Au(I) complex preferentially partitions into the TMG-AA IL-rich phase, achieving an extraction efficiency of up to 99.0% under the optimized conditions. The extraction mechanism of Au(I) was elucidated through comprehensive characterizations including Fourier transform infrared spectroscopy, nuclear magnetic resonance, and X-ray photoelectron spectroscopy. Driven by electrostatic interactions, gold thiosulfate migrates into the IL-rich phase, where it undergoes anion exchange with amino acid anions and forms ion pairs with guanidinium cations in the TMG-AA ILs. Extraction experiments using thiosulfate leachate from discarded circuit boards confirmed that the IL-ATPS exhibits high selectivity for gold with negligible extraction of other metal ions. The loaded IL phase can be effectively regenerated via stripping with a KSCN solution. In five consecutive extraction-stripping cycles, the results of the first three cycles showed that the gold extraction efficiency slightly decreased from 98.7 to 90.0% and the stripping efficiency decreased from 84.7 to 82.3%, which confirmed the good recyclability of the AA IL-ATPS system
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|a Journal Article
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| 700 |
1 |
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|a Zhu, Guiping
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Chen, Wenjing
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Lei, Fan
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Xiang, Hao
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Yang, Xiangjun
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Wang, Shixiong
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1985
|g 41(2025), 28 vom: 22. Juli, Seite 18834-18847
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnas
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| 773 |
1 |
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|g volume:41
|g year:2025
|g number:28
|g day:22
|g month:07
|g pages:18834-18847
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|u http://dx.doi.org/10.1021/acs.langmuir.5c02186
|3 Volltext
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