Efficient Recycling of Gold and Copper from Electronic Waste by Selective Precipitation.
Efficient Recycling of Gold and Copper from Electronic Waste by Selective Precipitation.
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通过选择性沉淀从电子废物中高效回收金和铜。
DOI：
10.1002/anie.202308356
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发表时间：
2023
期刊：
影响因子：
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通讯作者：
Nag A
中科院分区：
文献类型：
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作者：
Nag A
使用高效、有选择性和可持续的工艺从电子废物中回收金属是循环经济和净零愿望的组成部分。在这里，我们报告了一种新的方法，用于选择性沉淀的金属，如金和铜，抵消了使用的有机溶剂，传统上采用的溶剂萃取过程。我们表明，金可以选择性地沉淀从金属的混合物在盐酸溶液中使用三苯基膦氧化物（TPPO），作为配合物[（TPPO）4（H5 O2）][AuCl 4]。通过调节酸浓度，可以实现金、锌和铁的受控沉淀。我们还表明，铜可以选择性沉淀使用2，3-吡嗪二羧酸（2，3-PDCA），作为配合物[Cu（2，3-PDCA-H）2]n <$2n（H2O）。这两种沉淀方法的组合导致回收了报废计算机处理单元的连接器引脚中存在的99.5%的Au和98.5%的Cu。这些沉淀过程的选择性，结合其简单的操作以及回收和再利用沉淀剂的能力，表明了从电子废物中纯化金和铜的潜在工业用途。
The recycling of metals from electronic waste (e‐waste) using efficient, selective, and sustainable processes is integral to circular economy and net‐zero aspirations. Herein, we report a new method for the selective precipitation of metals such as gold and copper that offsets the use of organic solvents that are traditionally employed in solvent extraction processes. We show that gold can be selectively precipitated from a mixture of metals in hydrochloric acid solution using triphenylphosphine oxide (TPPO), as the complex [(TPPO)4(H5O2)][AuCl4]. By tuning the acid concentration, controlled precipitation of gold, zinc and iron can be achieved. We also show that copper can be selectively precipitated using 2,3‐pyrazinedicarboxylic acid (2,3‐PDCA), as the complex [Cu(2,3‐PDCA‐H)2]n⋅ 2n(H2O). The combination of these two precipitation methods resulted in the recovery of 99.5 % of the Au and 98.5 % of the Cu present in the connector pins of an end‐of‐life computer processing unit. The selectivity of these precipitation processes, combined with their straightforward operation and the ability to recycle and reuse the precipitants, suggests potential industrial uses in the purification of gold and copper from e‐waste.