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240304s2024 xx |||||o 00| ||eng c |
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|a 10.1016/j.wasman.2024.02.043
|2 doi
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|a pubmed25n1230.xml
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|a (DE-627)NLM36920624X
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|a (NLM)38430749
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|a (PII)S0956-053X(24)00128-4
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|a eng
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| 100 |
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|a Wang, Ruixue
|e verfasserin
|4 aut
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|a Process and systematic study of gold recovery from flexible printed circuit boards (FPCBs) using a choline chloride-ethylene glycol system
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|c 2024
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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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|2 rdacarrier
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|a Date Completed 18.03.2024
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|a Date Revised 18.03.2024
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Copyright © 2024 Elsevier Ltd. All rights reserved.
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|a The traditional hydrometallurgy technology has been widely used to recover precious metals from electronic waste. However, such aqueous recycling systems often employ toxic/harsh chemicals, which may cause serious environmental problems. Herein, an efficient and environment-friendly method using a deep eutectic solvent (DES) mixed system of choline chloride-ethylene glycol-CuCl2·2H2O is developed for gold (Au) recovery from flexible printed circuit boards (FPCBs). The Au leaching and precipitation efficiency can reach approximately 100 % and 95.3 %, respectively, under optimized conditions. Kinetic results show that the Au leaching process follows a nucleation model, which is controlled by chemical surface reactions with an apparent activation energy of 80.29 kJ/mol. The present recycling system has a much higher selectivity for Au than for other base metals; the two-step recovery rate of Au can reach over 95 %, whereas those of copper and nickel are < 2 %. Hydrogen nuclear magnetic resonance spectroscopy (HNMR) and density functional theory (DFT) analyses confirm the formation of intermolecular hydrogen bonds in the DES mixed system, which increase the system melting and boiling points and facilitate the Au leaching process. The Au leaching system can be reused for several times, with the leaching efficiency remaining > 97 % after five cycles. Moreover, ethylene glycol (EG) and choline chloride (ChCl) act as aprotic solvents as well as coordinate with metals, decreasing the redox potential to shift the equilibrium to the leaching side. Overall, this research provides a theoretical and a practical basis for the recovery of metals from FPCBs
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|a Journal Article
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|a Deep eutectic solvent
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|a Density functional theory analysis
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|a Flexible printed circuit board
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|a Intermolecular hydrogen bonding
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|a Selective gold recovery
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|a Gold
|2 NLM
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|a 7440-57-5
|2 NLM
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|a Choline
|2 NLM
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|a N91BDP6H0X
|2 NLM
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|a Copper
|2 NLM
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|a 789U1901C5
|2 NLM
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| 650 |
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|a Ethylene Glycols
|2 NLM
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| 700 |
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|a Fan, Guoliang
|e verfasserin
|4 aut
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|a Zhang, Chenglong
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Waste management (New York, N.Y.)
|d 1999
|g 178(2024) vom: 15. Apr., Seite 351-361
|w (DE-627)NLM098197061
|x 1879-2456
|7 nnas
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| 773 |
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|g volume:178
|g year:2024
|g day:15
|g month:04
|g pages:351-361
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|u http://dx.doi.org/10.1016/j.wasman.2024.02.043
|3 Volltext
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