在水溶液中通过接触电催化减少贵金属离子
Yusen Su1,2, Andy Berbille1,2, Xiao-Fen Li1,3
1CAS Center for Excellence in Nanoscience, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400, China.
Nature communications
|May 17, 2024
概括
超声波接触电催化 (CEC) 有效地减少贵金属离子,并从溶液中提取黄金. 这种无金属,可回收的方法为从电子废物中回收贵金属提供了一种可持续的方法.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 电化学 电化学 电化学
- 环境科学 环境科学
背景情况:
- 贵金属对现代技术至关重要,但它们的稀缺性需要有效的生命周期管理和回收策略.
- 在水固体接口上的接触电化 (CE) 通过接触电催化 (CEC) 驱动氧还原反应,提供无金属的催化方法.
- 现有的CEC应用包括降解有机化合物,产生过氧化,以及从使用过的离子电池中出金属.
研究的目的:
- 研究超声波CEC在不同条件下降低各种贵金属离子的功效.
- 阐明CE和CEC之间的联系机制,特别是氧气的作用.
- 展示CEC的应用,用于从水溶液和电子废物浸出物中选择性和可回收的提取黄金.
主要方法:
- 超声波接触电催化 (CEC) 被用于驱动多种贵金属离子 (Ag,Rh,Pt,Au,Hg,Pd,Ir) 的减少.
- 在无氧和有氧条件下进行反应,以研究氧气的影响.
- 电子偏磁共振 (EPR) 光谱,ab-initio模拟和电荷转移测量被用来理解CE-CEC链接.
- 在合成溶液和电子废物浸出物上进行了金矿开采实验,以评估CEC的效率和选择性.
主要成果:
- 超声波CEC成功地降低了Ag ((ac),Rh3+,PtCl42-,Ag+,Hg2+,Pd2+,AuCl4-,以及Ir3+.
- 该研究通过电荷转移测量,EPR光谱和黄金开采实验,确定了CE和CEC之间的联系.
- CEC从合成溶液 (0.196-196ppm) 中表现出高的黄金提取能力,在3小时内达到0.756至7222.5毫克g-1的水平.
- 该方法被证明是有效的选择性和可回收的从电子废物水性液中提取黄金.
结论:
- 超声波CEC是一种多功能且高效的方法,用于减少各种贵金属离子.
- 这项研究阐明了接触电气化和接触电催化之间的机制联系.
- CEC提供了一种有前途的,无金属的,有选择性的和可回收的方法,用于从电子废物中回收黄金,解决资源稀缺问题.
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