Insight into the Liquid–Liquid Extraction System AuCl4−/HCl/A327H+Cl− Ionic Liquid/Toluene

The ionic liquid A327H+Cl− is generated by reaction of the tertiary amine A327 (industrial mixture of tri-octyl and tri-decyl amines) and hydrochloric acid solutions. In this study, the extraction of Au(III) by A327H+Cl− ionic liquid under various variables, including metal and ionic liquid concentr...

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Bibliographic Details
Published inProcesses Vol. 9; no. 4; p. 608
Main Authors Alguacil, Francisco J., Lopez, Félix A.
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.04.2021
Subjects
Amines
Aqueous solutions
Exothermic reactions
Gold
Hydrochloric acid
Investigations
Ionic liquids
Ionic strength
Ions
Metals
Nanoparticles
Thiocyanates
Toluene
Viscosity
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Summary:The ionic liquid A327H+Cl− is generated by reaction of the tertiary amine A327 (industrial mixture of tri-octyl and tri-decyl amines) and hydrochloric acid solutions. In this study, the extraction of Au(III) by A327H+Cl− ionic liquid under various variables, including metal and ionic liquid concentrations, was investigated. Results indicate that A327H+AuCl4− is formed by an exothermic (ΔH° = −3 kJ/mol) reaction in the organic solution. Aqueous ionic strength influences the formation constant values, and the specific interaction theory (SIT) was used to estimate the interaction coefficient between AuCl4− and H+. Gold (III) was stripped using thiocyanate media, and from the strip solutions, gold was precipitated as gold nanoparticles.
ISSN:2227-9717
2227-9717
DOI:10.3390/pr9040608