化学
溶解度
浸出(土壤学)
氯化胆碱
草酸
选择性
金属
无机化学
核化学
锌
萃取(化学)
深共晶溶剂
共晶体系
有机化学
催化作用
合金
环境科学
土壤科学
土壤水分
作者
Snigdha Mishra,Timothy N. Hunter,Kamal K. Pant,David Harbottle
出处
期刊:Chemsuschem
[Wiley]
日期:2024-01-30
卷期号:17 (8)
被引量:1
标识
DOI:10.1002/cssc.202301418
摘要
Abstract Waste PCBs the core of e‐waste is rich in copper, tin, zinc, iron, and nickel. Leaching base metals from PCB used to be done in toxic, corrosive acidic/alkali mediums. In this work, an environmentally friendly method for leaching metals from thermally treated PCBs (TPCBs) of mobile phones was proposed using choline chloride based deep eutectic solvents (DES). DES selectivity and solubility of metals from metal oxides were the main screening criteria. FA−ChCl had the maximum solubility of Cu, Fe, and Ni, while Urea−ChCl had high Zn selectivity and solubility. Oxalic acid has high selectivity for Sn. FA−ChCl extracted Cu and Fe best at 16 h, 100 °C, and 1/30 g/mL. Urea−ChCl extracted Zn (90.4±2.9 %) from TPCBs at 100 °C, 21 h, 1/20 g/mL, and 400 rpm. Oxalic acid (1 M) removed 92.3±2.1 % Sn from TPCBs in 1 h at 80 °C and 1/20 g/mL. The shrinking core model‐based kinetic investigation of FA−ChCl for Cu extraction showed a diffusion‐controlled process. The proposed method is greener than mineral acids utilized for metal extraction.
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