Tuneable separation of gold by selective precipitation using a simple and recyclable diamide.
Tuneable separation of gold by selective precipitation using a simple and recyclable diamide.
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使用简单且可回收的二酰胺通过选择性沉淀可调谐地分离金。
DOI：
10.1038/s41467-021-26563-7
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发表时间：
2021-10-29
影响因子：
16.6
通讯作者：
Love JB
中科院分区：
文献类型：
--
作者：
Kinsman LMM;Ngwenya BT;Morrison CA;Love JB
从矿石和电子废物等二次资源中有效分离金属是实现金属供应循环的必要条件。沉淀过程越来越受欢迎，并且依赖于设计和理解化学识别以实现选择性。在这里，我们表明，一个简单的叔二酰胺沉淀金选择性从酸性水溶液，包括从王水溶液的电子废物。沉淀物的X-射线晶体结构显示与四氯金酸盐交错的二酰胺阳离子的无限链。金在与水接触时从沉淀物中释放，使得配体能够再循环。该二酰胺具有高度选择性，在2 M HCl中加入29种金属，可使金的吸收率达到70%，而其他金属的去除率最低。在6 M HCl，金，铁，锡和铂的完全收集发生，表明适应性选择性金属沉淀仅由一个变量控制。这一发现可以利用在金属精炼和回收过程中，由于其可调的选择性在不同的浸出条件下，避免了有机溶剂固有的两相萃取，和直接回收的沉淀剂。从电子废物中分离金属是一项持久的技术和社会挑战，需要新的金属提取、精炼和回收解决方案。在这里，作者报告了一种可回收和可调节的化学试剂，该试剂通过直接和选择性沉淀从与提取和回收工业相关的各种酸性混合金属溶液中分离有价值的金属，如金。
The efficient separation of metals from ores and secondary sources such as electronic waste is necessary to realising circularity in metal supply. Precipitation processes are increasingly popular and are reliant on designing and understanding chemical recognition to achieve selectivity. Here we show that a simple tertiary diamide precipitates gold selectively from aqueous acidic solutions, including from aqua regia solutions of electronic waste. The X-ray crystal structure of the precipitate displays an infinite chain of diamide cations interleaved with tetrachloridoaurate. Gold is released from the precipitate on contact with water, enabling ligand recycling. The diamide is highly selective, with its addition to 29 metals in 2 M HCl resulting in 70% gold uptake and minimal removal of other metals. At 6 M HCl, complete collection of gold, iron, tin, and platinum occurs, demonstrating that adaptable selective metal precipitation is controlled by just one variable. This discovery could be exploited in metal refining and recycling processes due to its tuneable selectivity under different leaching conditions, the avoidance of organic solvents inherent to biphasic extraction, and the straightforward recycling of the precipitant. The separation of metals from electronic waste is an enduring technological and societal challenge, and new metal extraction, refining and recycling solutions are needed. Here the authors report a recyclable and tuneable chemical reagent that separates valuable metals such as gold by direct and selective precipitation from various acidic, mixed-metal solutions of relevance to extraction and recycling industries.
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影响因子：
16.6
作者：
Doidge, Euan D.;Carson, Innis;Love, Jason B.
通讯作者：
Love, Jason B.
影响因子：
16.6
作者：
通讯作者：
--
影响因子：
5.5
作者：
Contreras-Garcia, Julia;Johnson, Erin R.;Keinan, Shahar;Chaudret, Robin;Piquemal, Jean-Philip;Beratan, David N.;Yang, Weitao
通讯作者：
Yang, Weitao
DOI：
10.1073/pnas.2000606117
发表时间：
2020-07-14
影响因子：
11.1
作者：
Hong, Yeongran;Thirion, Damien;Yavuz, Cafer T.
通讯作者：
Yavuz, Cafer T.
影响因子：
2.2
作者：
Hagelueken, Christian;Corti, Christopher W.
通讯作者：
Corti, Christopher W.