在乙碱深共晶溶剂中从光伏电池中回收银的循环再利用概念†。

循环经济的概念在科技助力下得以实践，如电子产品回收再利用 #生活知识# #生活感悟# #科技生活变迁# #科技与环保的关系#

在乙碱深共晶溶剂中从光伏电池中回收银的循环再利用概念†。

Charly Lemoine, Yann Petit, Thomas Karaman, Gøril Jahrsengene, Ana Maria Martinez, Anass Benayad and Emmanuel Billy

摘要

要克服环境挑战，就必须减少回收工艺的阶段数量、能源成本和碳足迹。用毒性更小、更环保的深共晶溶剂 (DES) 取代传统湿法冶金方法中使用的酸的兴趣日益浓厚。本研究的目的是评估这类溶剂在浸出和电沉积离子冶金工艺中的潜在用途，以回收银，作为太阳能电池板回收的一部分，这也是未来几年的一项重大挑战。在本研究中，我们研究了一种基于铁氧化还原梭的循环回收概念，通过电沉积来浸出和回收银。结合六水氯化铁（III）氧化剂对不同的 DES 进行了评估。乙醇 DES 能在 75 °C 下对结晶硅电池碎片达到 99.9% 的高银浸出效率，因此备受关注。良好的结果促使我们对这种化学体系的极限进行了全面研究，重点是物种（铁和水）的浓度、银的界面电位（电化学测量）和表面演化（X 射线光电子能谱分析）之间的关系。银的浸出被确定为一种混合控制机制，涉及化学依赖性和物种扩散依赖性。氯化铁（III）的浓度似乎至关重要，它决定了形成溶解性差的 AgCl 层的动力学。从浸出液中进行电沉积强调了使用无氧气氛生产高质量银的必要性。最后，在氩气环境下，使用乙碱液（1 : 2）+FeCl3-6H2O（0.12 mol L-1）在 75 °C 下浸出和 50 °C 下电沉积结晶硅电池碎片中的银。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Circular recycling concept for silver recovery from photovoltaic cells in Ethaline deep eutectic solvent†

Reducing the number of stages, energy costs and carbon footprint of recycling processes is essential to overcome environmental challenges. The interest in replacing the acids used in traditional hydrometallurgical methods with deep eutectic solvents (DES), which are less toxic and more environmentally friendly, has been growing. The aim of this study is to estimate the potential use of this class of solvents in an ionometallurgical process of leaching and electrodeposition to recover silver as part of the recycling of solar panels, a major challenge of the years to come. In the present work, a circular recycling concept based on an iron redox shuttle was studied to leach and recover silver via electrodeposition. Different DESs were evaluated in combination with a hexahydrated iron(III) chloride oxidizing agent. Ethaline DES has gained significant interest as it can attain a high silver leaching efficiency of 99.9% on crystallized silicon cell scraps at 75 °C. The promising results led to a comprehensive study of limits of this chemical system, focusing on the relation between the concentration of species (iron and water), the interfacial potential of silver (electrochemical measurements), and surface evolution (X-ray photoelectron spectroscopy analysis). Silver leaching was determined as a mixed control mechanism involving chemical and species diffusion dependence. The concentration of iron(III) chloride appeared crucial, determining the kinetic of formation of a poorly soluble AgCl layer. Electrodeposition from leachate highlighted the need to use an oxygen-free atmosphere to produce high-quality silver. Finally, leaching at 75 °C and electrodeposition at 50 °C of silver from crystallized silicon cell scraps were demonstrated using Ethaline (1 : 2) + FeCl3·6H2O (0.12 mol L−1) under an argon atmosphere.

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网址：在乙碱深共晶溶剂中从光伏电池中回收银的循环再利用概念†。 https://www.yuejiaxmz.com/news/view/841640

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