从废弃物中回收铜作为二次资源的负碳循环利用深度环氧溶剂
Kang Liu1, Mengmeng Wang1, Qiaozhi Zhang2
1Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China; Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China.
Journal of hazardous materials
|December 19, 2023
概括
这项研究介绍了一种绿色方法,用于使用深度环氧溶剂 (DES) 从电子废物中提取铜. 该过程显著减少碳排放,支持可持续的铜回收利用和低碳经济.
科学领域:
- 绿色化学 绿色化学
- 材料科学 材料科学 材料科学
- 环境工程 环境工程
背景情况:
- 铜对于低碳转型至关重要,特别是随着电动汽车的兴起.
- 从电子垃圾中回收铜对于可持续性和资源管理至关重要.
- 传统的铜取方法可能会对环境产生重大影响.
研究的目的:
- 开发一种环境友好的方法,利用深度环氧溶剂 (DES) 从废料中选择性提取铜.
- 通过使用DES来研究铜出过程中的机械相互作用.
- 评估拟议的回收过程对环境的好处,特别是减少碳足迹.
主要方法:
- 从印刷电路板 (PCB) 废弃物中选择性地出铜,使用化-乙烯基醇 (ChCl-EG) DES与过氧化.
- 分子动力学和密度函数理论模拟以了解DES-铜相互作用.
- 用于从DES液中选择性回收铜的电.
- 生命周期评估 (LCA) 用于量化二氧化碳排放减少.
主要成果:
- 在温和条件下 (25分钟,20°C,5重%H2O2) 使用ChCl-EG DES从PCB废料中实现了高效的铜出.
- 模拟提供了对铜种和DES之间的氧化复合反应的机械洞察力.
- 通过电沉积证明了铜回收的高选择性,将其从Pb2+,Sn2+和Al3+等杂质中分离出来.
- 该过程显示,二氧化碳排放量显著减少 (每1000公斤废弃PCB的CO2eq为-93.6公斤).
结论:
- ChCl-EG DES提供了一种绿色和有效的溶剂,用于从废PCB中选择性提取铜.
- 溶解金方法显著减轻了与铜生产相关的碳足迹.
- 这种回收过程有助于循环经济,并支持全球低碳倡议.
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