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Article: High-Efficiency Gold Recovery Using Cucurbit[6]uril

TitleHigh-Efficiency Gold Recovery Using Cucurbit[6]uril
Authors
Keywordscoprecipitate
outer surface interaction
precious metal
resource recovery
solid-state superstructure
supramolecular assembly
Issue Date2020
Citation
ACS Applied Materials and Interfaces, 2020, v. 12, n. 34, p. 38768-38777 How to Cite?
AbstractDeveloping an extremely efficient and highly selective process for gold recovery is urgently desired for maintaining a sustainable ecological environment. Herein, we report a highly efficient gold-recovery protocol on the basis of the instantaneous assembly between cucurbit[6]uril (CB[6]) and [AuX4]- (X = Cl/Br) anions. Upon mixing CB[6] with the four gold-bearing salts MAuX4 (M = H/K, X = Cl/Br) in aqueous solutions, yellow or brown coprecipitates form immediately, as a result of multiple weak [Au-X···H-C] (X = Cl/Br) hydrogen-bonding and [Au-X···C=O] (X = Cl/Br) ion-dipole interactions. The gold-recovery efficiency, based on CB[6]·HAuCl4 coprecipitation, reaches 99.2% under optimized conditions. In the X-ray crystal superstructures, [AuCl4]- anions and CB[6] molecules adopt an alternating arrangement to form doubly connected supramolecular polymers, while [AuBr4]- anions are accommodated in the lattice between two-dimensional layered nanostructures composed of CB[6] molecules. DFT calculations have revealed that the binding energy (34.8 kcal mol-1) between CB[6] molecules and [AuCl4]- anions is higher than that (11.3-31.3 kcal mol-1) between CB[6] molecules and [AuBr4]- anions, leading to improved crystallinity and higher yields of CB[6]·MAuCl4 (M = H/K) coprecipitates. Additionally, a laboratory-scale gold-recovery protocol, aligned with an attractive strategy for the practical recovery of gold, was established based on the highly efficient coprecipitation of CB[6]·HAuCl4. The use of CB[6] as a gold extractant provides us with a new opportunity to develop more efficient processes for gold recovery.
Persistent Identifierhttp://hdl.handle.net/10722/333654
ISSN
2023 Impact Factor: 8.3
2023 SCImago Journal Rankings: 2.058
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWu, Huang-
dc.contributor.authorJones, Leighton O.-
dc.contributor.authorWang, Yu-
dc.contributor.authorShen, Dengke-
dc.contributor.authorLiu, Zhichang-
dc.contributor.authorZhang, Long-
dc.contributor.authorCai, Kang-
dc.contributor.authorJiao, Yang-
dc.contributor.authorStern, Charlotte L.-
dc.contributor.authorSchatz, George C.-
dc.contributor.authorStoddart, J. Fraser-
dc.date.accessioned2023-10-06T05:21:20Z-
dc.date.available2023-10-06T05:21:20Z-
dc.date.issued2020-
dc.identifier.citationACS Applied Materials and Interfaces, 2020, v. 12, n. 34, p. 38768-38777-
dc.identifier.issn1944-8244-
dc.identifier.urihttp://hdl.handle.net/10722/333654-
dc.description.abstractDeveloping an extremely efficient and highly selective process for gold recovery is urgently desired for maintaining a sustainable ecological environment. Herein, we report a highly efficient gold-recovery protocol on the basis of the instantaneous assembly between cucurbit[6]uril (CB[6]) and [AuX4]- (X = Cl/Br) anions. Upon mixing CB[6] with the four gold-bearing salts MAuX4 (M = H/K, X = Cl/Br) in aqueous solutions, yellow or brown coprecipitates form immediately, as a result of multiple weak [Au-X···H-C] (X = Cl/Br) hydrogen-bonding and [Au-X···C=O] (X = Cl/Br) ion-dipole interactions. The gold-recovery efficiency, based on CB[6]·HAuCl4 coprecipitation, reaches 99.2% under optimized conditions. In the X-ray crystal superstructures, [AuCl4]- anions and CB[6] molecules adopt an alternating arrangement to form doubly connected supramolecular polymers, while [AuBr4]- anions are accommodated in the lattice between two-dimensional layered nanostructures composed of CB[6] molecules. DFT calculations have revealed that the binding energy (34.8 kcal mol-1) between CB[6] molecules and [AuCl4]- anions is higher than that (11.3-31.3 kcal mol-1) between CB[6] molecules and [AuBr4]- anions, leading to improved crystallinity and higher yields of CB[6]·MAuCl4 (M = H/K) coprecipitates. Additionally, a laboratory-scale gold-recovery protocol, aligned with an attractive strategy for the practical recovery of gold, was established based on the highly efficient coprecipitation of CB[6]·HAuCl4. The use of CB[6] as a gold extractant provides us with a new opportunity to develop more efficient processes for gold recovery.-
dc.languageeng-
dc.relation.ispartofACS Applied Materials and Interfaces-
dc.subjectcoprecipitate-
dc.subjectouter surface interaction-
dc.subjectprecious metal-
dc.subjectresource recovery-
dc.subjectsolid-state superstructure-
dc.subjectsupramolecular assembly-
dc.titleHigh-Efficiency Gold Recovery Using Cucurbit[6]uril-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/acsami.0c09673-
dc.identifier.pmid32648728-
dc.identifier.scopuseid_2-s2.0-85090078166-
dc.identifier.volume12-
dc.identifier.issue34-
dc.identifier.spage38768-
dc.identifier.epage38777-
dc.identifier.eissn1944-8252-
dc.identifier.isiWOS:000566662000100-

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