王水
浸出(土壤学)
离子液体
化学
微波食品加热
材料科学
核化学
金属
无机化学
冶金
催化作用
有机化学
环境科学
物理
量子力学
土壤科学
土壤水分
作者
Jongwon Choi,John Kwame Bediako,Jihun Kang,Che-Ryong Lim,Yub Raj Dangi,Hyojin Kim,Chul-Woong Cho,Yeoung‐Sang Yun
标识
DOI:10.1016/j.seppur.2020.117649
摘要
Waste printed circuit boards (WPCBs) contain high amounts and various types of precious metals; thus, it is necessary to efficiently and selectively recover these metals by eco-friendly and economic means. An in-situ microwave-assisted leaching and selective separation process employing biphasic aqua regia-ionic liquid systems was developed herein. It was hypothesized that the combined technique can pulverize the WPCB sample, while simultaneously leaching Au(III) and Cu(II) from the WPCBs and affording selective separation using the ionic liquid (IL), i.e. [C8mim][(CF3SO2)2N]. The results show that the microwave treatment increased the Au(III) and Cu(II) leaching efficiency by 45.56% and 10.83%, respectively, compared to the control test without microwave treatment, and the leached Au(III) and Cu(II) ions present in the aqua regia phase were simultaneously transferred into the IL phase, leading to high selective separation efficiencies, i.e. extraction rates of 95.50% and 1.26% for Au(III) and Cu(II), respectively. In the final stage, the concentrated Au(III) was back-stripped using 0.01 M thiourea in 0.1 M HCl solution. The recovery of Au(III) ions from the IL phase was 96.74 ± 2.19%. Consequently, it was revealed that microwave treatment in the aqua regia-IL phases can efficiently lead to pulverization of WPCBs and leaching of Au(III) and Cu(II), followed by selective separation of Au(III) from the leachate by the IL.
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