石墨烯
氧化物
材料科学
胶体金
吸附
水溶液中的金属离子
萃取(化学)
选择性
黄金提取
纳米技术
金属
化学工程
无机化学
化学
纳米颗粒
冶金
有机化学
催化作用
工程类
氰化物
作者
Fei Li,Jiuyi Zhu,Pengzhan Sun,Mingrui Zhang,Zhenqing Li,Dingxin Xu,Xinyu Gong,Xiaolong Zou,A. K. Geǐm,Yang Su,Hui‐Ming Cheng
标识
DOI:10.1038/s41467-022-32204-4
摘要
Materials that are capable of extracting gold from complex sources, especially electronic waste (e-waste) with high efficiency are needed for gold resource sustainability and effective e-waste recycling. However, it remains challenging to achieve high extraction capacity to trace amount of gold, and precise selectivity to gold over a wide range of complex co-existing elements. Here we report a reduced graphene oxide (rGO) material that has an ultrahigh extraction capacity for trace amounts of gold (1,850 mg/g and 1,180 mg/g to 10 ppm and 1 ppm gold). The excellent gold extraction behavior 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 provide a good dispersibility so that efficient adsorption and reduction of gold ions by the graphene area can be realized. The rGO is also highly selective to gold ions. By controlling the protonation process of the functional groups on the oxidized regions of rGO, it shows an exclusive gold extraction without adsorption of 14 co-existing elements seen in e-waste. These discoveries are further exploited in highly efficient, continuous gold recycling from e-waste with good scalability and economic viability, as exemplified by extracting gold from e-waste using a rGO membrane based flow-through process.
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