基于溶剂的水性双相系统的卓越性能,以酸为基础,用于绿色黄金分离
Guiping Zhu1, Boxian Ren1, Qiaoshu Zhou1
1Research Center of Lake Restoration Technology Engineering for Universities of Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China.
Langmuir : the ACS journal of surfaces and colloids
|June 27, 2023
概括
这项研究介绍了一种绿色方法,用于在水性双相系统 (ABS) 中使用深度环氧溶剂 (DES) 分离黄金. 一种基于DES的新型ABS通过离子交换机制实现了100%的黄金提取效率.
科学领域:
- 绿色化学和环境科学 绿色化学和环境科学
- 材料科学与工程 材料科学与工程
- 分离科学和技术 分离科学和技术
背景情况:
- 水性双相系统 (ABS) 为金属离子分离提供环保的平台.
- 深度环氧溶剂 (DES) 正在成为分离过程中的可持续替代品.
- 从青化溶液中有效和选择性地回收黄金仍然是金学中的一个关键挑战.
研究的目的:
- 使用聚乙烯糖醇400 (PEG 400) 和四级/盐合成新型DES.
- 构建和描述基于DES的ABS,以有效地将黄金从青化溶液中分离出来.
- 阐明黄金开采的机制,并探索其随后的回收.
主要方法:
- 使用PEG 400作为键供体和各种化物/化盐作为受体合成DESs.
- 构建DES+酸盐+水ABS,并确定相位图.
- 优化黄金提取参数 (DES/盐类型和含量,pH,时间,度) 和采用FT-IR,NMR,TEM和DFT的提取机制的表征.
主要成果:
- 从P4Br:PEG 1:2中合成的一种新型DES在最佳条件下,在ABS与酸中显示出100%的金提取效率.
- 提取机制被确定为离子交换,其中Au (CN) - - 取代Br,与P4+离子形成稳定的离子对,并与PEG 400进行结合.
- 从加载的DES阶段中回收的黄金成功地使用玻利化物将其降低到100%效率的元素黄金.
结论:
- 开发的基于DES的ABS提供了一种高效和绿色的战略,用于从黄金化物溶液中分离黄金.
- 涉及静电相互作用和键的离子交换机制是选择性黄金开采的关键.
- 这种方法为开发可持续的黄金回收技术提供了一个有希望的平台.
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