Gold Extraction through Vesicles Self-Assembled by Cationic Gemini Surfactant and Sodium Deoxycholate

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• 作者：Shubin Wang ; Xiaolu Yin ; Yan Yan ; Zeyang Xiang ; Peng Liu ; Yao Chen ; Xia Xin ; Yanzhao Yang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：July 27, 2016
• 年：2016
• 卷：55
• 期：29
• 页码：8207-8214
• 全文大小：474K
• 年卷期：0
• ISSN：1520-5045

文摘

A kind of self-assembled vesicles that composed of ionic liquid-type cationic gemini surfactant (C₃H₆-α, ω-(Me₂N⁺C₁₂H₂₅Cl^–)₂, 12-3-12) and anionic biological surfactant (sodium deoxycholate, SDC) were constructed for Au(III) extraction. The appearance and microstructure of vesicles system were characterized by visual and TEM images. Compared to the zeta potential of pure vesicles system (+45 ± 1 mV), zeta potential of gold-loaded vesicles system reduced 15 ± 1 mv (changed to +30 ± 1 mV), which confirmed the mechanism of Au(III) was effectively extracted by vesicles through electrostatic interaction. The main influence factors including extraction equilibrium time, surfactants concentration, NaCl concentration, and pH on the extraction efficiency (E%) were explored. Furthermore, an effective method was devoted for gold(III) stripping. Through stepwise extraction and ligand-modified vesicles system, Au(III), Cu(II), and Fe(III) were separated from a mixed solution successfully. In short, an effective and potential approach for the separation of Au(III) from HCl solution was investigated in our work, which can be helpful for gold recovery and environmental improvement.