Retrieval of Au, Ag, Cu precious metals coupled with electric energy production via an unconventional coupled redox fuel cell reactor
Retrieval of Au, Ag, Cu precious metals coupled with electric energy production via an unconventional coupled redox fuel cell reactor
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通过非常规耦合氧化还原燃料电池反应器回收金、银、铜贵金属并产生电能
DOI：
10.1016/j.jhazmat.2017.05.020
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发表时间：
2017-09-15
影响因子：
13.6
通讯作者：
Wu, Zu-Cheng
中科院分区：
文献类型：
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作者：
Zhang, Hui-Min;Fan, Zheng;Wu, Zu-Cheng
从水溶液或电子废物中回收重金属至关重要。通过构建乙醇-金属耦合氧化还原燃料电池（CRFCs），证明了Au、Ag和Cu的回收与发电。该电池独特地组装在PdNi/C阳极上，乙醇发生电氧化以产生电子，然后通过外部电路将金属离子还原为阴极上的金属，金属被回收。以0.5 M HAc-NaAc缓冲溶液为阴极，2.0 M乙醇/1.0 M碱性溶液为阳极，去除100 mg L ~（-1）金为例，开路电压为1.4 V，20 h金去除率大于96%，金的当量产能为2.0 kWh kg ~（-1）。当金和铜离子共存时，通过XPS分析确认了金属Cu在阴极电极上的形成晚于金属Au的形成。因此，该体系可以实现金、铜两种金属离子共存的分步电沉积。这项工作开发了一种从水溶液或电子废物中回收有价值金属的新方法。(C)2017爱思唯尔B. V.保留所有权利。
The recovery of heavy metals from aqueous solutions or e-wastes is of upmost importance. Retrieval of Au, Ag, and Cu with electricity generation through building an ethanol-metal coupled redox fuel cells (CRFCs) is demonstrated. The cell was uniquely assembled on PdNi/C anode the electro-oxidation of ethanol takes place to give electrons and then go through the external circuit reducing metal ions to metallic on the cathode, metals are recovered. Taking an example of removal of 100 mg L-1 gold in 0.5 M HAc-NaAc buffer solution as the catholyte, 2.0 M ethanol in 1.0 M alkaline solution as the anolyte, an open circuit voltage of 1.4V, more than 96% of gold removal efficiency in 20 h, and equivalent energy production of 2.0 kWh kg(-1) of gold can be readily achieved in this system. When gold and copper ions coexist, it was confirmed that metallic Cu is formed on the cathodic electrode later than metallic Au formation by XPS analysis. Thus, this system can achieve step by step electrodeposition of gold and copper while the two metal ions coexisting. This work develops a new approach to retrieve valuable metals from aqueous solution or e-wastes. (C) 2017 Elsevier B.V. All rights reserved.