Microemulsion Extraction of Gold(III) from Hydrochloric Acid Medium Using Ionic Liquid as Surfactant and Extractant

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• 作者：Yu Tong ; Lu Han ; Yanzhao Yang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：December 19, 2012
• 年：2012
• 卷：51
• 期：50
• 页码：16438-16443
• 全文大小：309K
• 年卷期：v.51,no.50(December 19, 2012)
• ISSN：1520-5045

文摘

A microemulsion consisting of cyclohexane, n-hexanol, hydrochloric acid solution, and the ionic liquid 1-n-tetradecyl-3-methylimidazolium bromide ([C₁₄mim]Br) was investigated for Au(III) extraction. In the extraction system, [C₁₄mim]Br bears double functions of surfactant and extractant. The anion-exchange mechanism of Au(III) extraction by [C₁₄mim]Br was confirmed by the method of continuous variation and infrared spectrum analysis. The effects of extraction time and various material concentrations were examined for Au(III) extraction. Under optimum conditions, almost all the Au(III) in hydrochloric acid solution was extracted to the microemulsion phase, which also has high selectivity for Au(III) over some metals (Cu(II), Cd(II), Co(II), Ni(II), Sb(III), Fe(III), Al(III), and Sn(IV)). Therefore, the extraction of Au(III) by the [C₁₄mim]Br/cyclohexane/n-hexanol/HCl microemulsion is an efficient and effective approach with high selectivity.