Highly efficient and selective extraction of gold by reduced graphene oxide.
Highly efficient and selective extraction of gold by reduced graphene oxide.
复制标题
通过还原的氧化石墨烯高效、选择性地提取金。
DOI：
10.1038/s41467-022-32204-4
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发表时间：
2022-08-02
影响因子：
16.6
通讯作者：
中科院分区：
文献类型：
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作者：
为了实现黄金资源的可持续性和有效的电子废物回收利用，需要能够从复杂来源，特别是电子废物中提取黄金的材料。然而，如果只有微量的金和其他金属元素存在，则实现高萃取能力和精确选择性仍然是具有挑战性的。在这里，我们报告了一种基于还原氧化石墨烯（rGO）的方法，该方法提供了超高容量和选择性提取ppm浓度下的金离子（1ppm时每克氧化石墨烯可提取1000毫克金）。优异的金萃取性能主要归功于氧化石墨烯区和氧化还原氧化石墨烯区。石墨烯区自发地将金离子还原为金属金，氧化区使还原氧化石墨烯材料具有良好的分散性，从而实现了金离子在石墨烯区的高效吸附和还原。通过控制氧化还原石墨烯氧化区域的质子化，可以完全提取金，而不会受到电子垃圾中通常存在的其他14种共存元素的污染。这些发现被进一步利用，以证明从现实世界的电子垃圾中回收黄金具有良好的可扩展性和经济可行性，例如在连续流动过程中使用还原氧化石墨烯膜。在广泛的共存元素中精确选择性地提取痕量金的高萃取能力仍然是有效回收电子废物的一个挑战。在这里，作者展示了还原氧化石墨烯从电子垃圾渗滤液中提取金的优异性能，即使是在极低的浓度下。
Materials capable of extracting gold from complex sources, especially electronic waste (e-waste), are needed for gold resource sustainability and effective e-waste recycling. However, it remains challenging to achieve high extraction capacity and precise selectivity if only a trace amount of gold is present along with other metallic elements . Here we report an approach based on reduced graphene oxide (rGO) which provides an ultrahigh capacity and selective extraction of gold ions present in ppm concentrations (>1000 mg of gold per gram of rGO at 1 ppm). The excellent gold extraction performance is accounted to the graphene areas and oxidized regions of rGO. The graphene areas spontaneously reduce gold ions to metallic gold, and the oxidized regions allow good dispersibility of the rGO material so that efficient adsorption and reduction of gold ions at the graphene areas can be realized. By controlling the protonation of the oxidized regions of rGO, gold can be extracted exclusively, without contamination by the other 14 co-existing elements typically present in e-waste. These findings are further exploited to demonstrate recycling gold from real-world e-waste with good scalability and economic viability, as exemplified by using rGO membranes in a continuous flow-through process. High extraction capacity with precise selectivity to trace amounts of gold over a wide range of co-existing elements remains a challenge for effective e-waste recycling. Here, authors demonstrate the excellent performance of rGO for gold extraction from e-waste leachate, even at minute concentrations.
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影响因子：
16.6
作者：
通讯作者：
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Au/石墨烯水凝胶：合成、表征及其在 4-硝基苯酚催化还原中的应用
影响因子：
--
作者：
Li, Jing;Liu, Chun-yan;Liu, Yun
通讯作者：
Liu, Yun
影响因子：
29.4
作者：
Erickson, Kris;Erni, Rolf;Zettl, Alex
通讯作者：
Zettl, Alex
影响因子：
11.4
作者：
Chowdhury, Indranil;Duch, Matthew C.;Bouchard, Dermont
通讯作者：
Bouchard, Dermont
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.