Ionic-Liquid-Type Imidazolium Gemini Surfactant Based Water-in-Oil Microemulsion for Extraction of Gold from Hydrochloric Acid Medium

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• 作者：Shubin Wang ; Yan Zheng ; Hong Zhang ; Yan Yan ; Xia Xin ; Yanzhao Yang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：March 16, 2016
• 年：2016
• 卷：55
• 期：10
• 页码：2790-2797
• 全文大小：488K
• ISSN：1520-5045

文摘

A microemulsion with hydrochloric acid solution as the polar phase, n-heptane as the continuous phase, [C₁₄-4-C₁₄im]Br₂ as an ionic-liquid-type imidazolium gemini surfactant and extractant, and n-amyl alcohol as cosurfactant was studied on Au(III) extraction. Compared to its corresponding monomer [C₁₄-mim]Br-based microemulsion for Au(III) extraction, the [C₁₄-4-C₁₄im]Br₂-based microemulsion system showed excellent extractability of Au(III). The anion-exchange mechanism of Au(III) extraction was confirmed by the slope method and spectrum analysis (UV–vis, FT-IR, and ¹H NMR). Main influence factors such as phase ratio, extraction equilibrium time, amyl alcohol volume fraction, and the concentration of ionic liquid on the extraction efficiency (E%) were explored. Moreover, [C₁₄-4-C₁₄im]Br₂-based water-in-oil microemulsion had high selectivity over a multimetal ion solution (Co (II), Cu(II), Fe(III), Ni(II), Sn(IV), and Al(III)). Therefore, it is indicated that [C₁₄-4-C₁₄im]Br₂-based microemulsion provides an effective and potential approach for the separation and purification of Au(III) from HCl solution.