Electrocatalytic recovery of elements from complex mixtures using deep eutectic solvents
Electrocatalytic recovery of elements from complex mixtures using deep eutectic solvents
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DOI：
10.1039/c4gc02246g
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发表时间：
2015-01-01
期刊：
影响因子：
9.8
通讯作者：
Jenkin, Gawen R. T.
中科院分区：
文献类型：
--
作者：
Abbott, Andrew P.;Harris, Robert C.;Jenkin, Gawen R. T.
从复杂混合物中溶解并随后选择性回收元素自然需要氧化还原化学。大多数工艺包括湿法冶金溶解，然后进行选择性化学沉淀或电化学提取。这些工艺的原子和能源效率很低，导致产生大量含水溶液废弃物，在处置前需要进行处理。在这项研究中，证明了电催化是一种进行消解并随后从溶液中回收元素的原子高效方法。在此，与标准水溶液值相比，使用低共熔溶剂来简化溶质的形态，并使氧化还原电位能够被改变。所使用的氧化还原催化剂是碘，因为它表现出高溶解度、快速电子转移以及氧化大多数元素（包括金等贵金属）的能力。使用三个样品（铜/锌、镓/砷和金/银/硫化矿）证明了这种电催化方法的有效性。
The dissolution and subsequent selective recovery of elements from complex mixtures naturally necessitates redox chemistry. The majority of processes involve hydrometallurgical dissolution followed by selective chemical precipitation or electrochemical winning. The atom and energy efficiencies of these processes are poor, leading to a large volume of aqueous waste which needs to be treated before disposal. In this study it is demonstrated that electrocatalysis is an atom effective method of carrying out digestion and subsequently recovering elements from solution. Here, deep eutectic solvents are used to simplify the speciation of solutes and to allow redox potentials to be modified, compared to standard aqueous values. The redox catalyst used is iodine, as it demonstrates high solubility, fast electron transfer and the ability to oxidise most elements, including precious metals such as gold. The efficacy of this electrocatalytic method is demonstrated using three samples; Cu/Zn, Ga/As and Au/Ag/sulfidic ore.