期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 9, 期 24, 页码 8186-8197出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.1c01789
关键词
Electrodeposition; Redox replacement; Precious metal; Circular economy; Bimetallic particles
资金
- Academy of Finland [322214, 334818, 319691, 297962]
- Aalto University
- Chinese Scholarship Council (CSC)
- Ella and Georg Ehrnrooth Foundation
- Academy of Finland (AKA) [334818, 297962, 322214, 322214, 334818] Funding Source: Academy of Finland (AKA)
Ag/Zn and Ag particles were successfully produced from zinc process solutions with high zinc concentration using electrodeposition-redox replacement method. The process consists of zinc deposition, redox replacement, and formation of Zn/Ag alloy structure. The promising results demonstrate the feasibility of producing Ag-based functional materials utilizing trace amounts of Ag from zinc process solutions.
Ag/Zn and Ag particles have been successfully produced from electrolytes simulating zinc process solutions containing a high zinc concentration (65 g/L) and a negligible silver concentration (0.5-50 ppm) using a facile and sustainable electrodeposition-redox replacement (EDRR) method. Results show that the particle size and chemical composition of the deposited Ag/Zn and Ag particles can be readily controlled by varying the operating parameters such as replacement time and agitation. Electrochemical quartz crystal microbalance (EQCM) studies supported with SEM-EDS and TEM results indicate that the EDRR process consists of three regions: (I) zinc pulse deposition; (II) redox replacement between the Ag+ ions and the deposited Zn, formation of a Zn/Ag alloy structure, and competing Zn oxidation by H+ ions; and (III) further replacement between Ag+ ions and Zn (alloy) formed in the previous stage and possible silver reduction by hydrogen. The Zn (alloy) has a higher reduction potential which hinders the competing H+ reduction and sequentially improves the utilization efficiency of the sacrificial metal (Zn). Furthermore, by using the EDRR method, Ag/Zn particles could be successfully obtained from solutions with an extremely low Ag concentration of 0.5 ppm. The promising results demonstrate the feasibility of producing Ag-based functional materials utilizing trace amounts of Ag from zinc process solutions.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据