关于在伊米达酸离子液中黄金溶解性能和机制的研究
Na Zhang1, Yuxin Zhang1, Zhengyu Liu1
1School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Molecules (Basel, Switzerland)
|February 24, 2024
概括
新的离子液体 (ILs),如意达酸,提供高效的黄金出. 化物中较短的碳链增强了黄金溶解率,其中[C2MIM][OCN]表现最好.
科学领域:
- 绿色化学是一种绿色化学.
- 材料科学是一种材料科学.
- 无机化学 无机化学 无机化学
背景情况:
- 传统的黄金出方法往往涉及强化学品.
- 越来越需要环保和高效的黄金开采技术.
- 离子液体 (ILs) 是一个有前途的替代品,因为它们的调节性质.
研究的目的:
- 合成和描述用于黄金炼的新型伊米达酸离子液体 (ILs).
- 为了评估这些ILs的黄金溶解能力.
- 用这些IL来研究黄金溶解背后的机制.
主要方法:
- 使用NMR,FTIR和TG分析合成和表征伊米达酸ILs ([C2MIM][OCN],[C3MIM][OCN],[C4MIM][OCN]).使用NMR,FTIR和TG分析.
- 动态浸出试验和扫描电子显微镜 (SEM) 评估黄金溶解性能.
- 使用NMR光谱和电子喷雾电离质谱法 (ESI-MS) 的机制调查.
主要成果:
- 所有合成的伊米达酸都显示出黄金溶解能力.
- 黄金溶解率随着伊米达环上的碳链长度的减少而增加,其中[C2MIM][OCN]是最有效的.
- 在增加IL度,温度和使用较少极性溶剂时观察到最佳溶解.
- 在120小时后,黄金叶的减肥量在[C2MIM][OCN]中达到2.9毫克/厘米2,在40°C的10重%水中.
结论:
- 伊米达酸是有效的绿色试剂用于黄金出.
- 黄金溶解的有效性受到IL结构,度,温度和溶剂极性的影响.
- 拟议的机制涉及黄金的氧化和协调与N- heterocyclic carbenes来自imidazolium离子.
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