Novel recovery of a low-concentration gold thiosulfate complex through electroreduction via a walnut shell charcoal electrode

• DOI: 10.1016/j.gsme.2024.03.004
• Publication Date: 2024-03-25T08:40:14Z
• Authors: Qizheng Weng; Shaoxian Song; Weiquan Zhan; Xuan Zhang; Ziwei Xiang; Jiabei Gao; Feifei Jia
• Keywords: Charcoal; Activated Charcoal

Low-concentration Au(S2O3)23− recovery is an urgent issue to facilitate the application of thiosulfate leaching instead cyanide in factories. Herein, this work presents a novel low-concentration combining adsorption and electrodeposition (electroreduction) realize high form gold particles (Au0). Walnut shells were used as raw material for successful preparation charcoal with porous structure rich oxygen-containing functional groups. shell (WSC) electrode achieved efficient Au(S2O3)23−. The under conditions was higher than 90%, highest reduction 46.97 mg·g−1. Applying suitable low voltage (0.8 V) facilitated recovery, which immensely improved that without voltage. performances applied via WSC related electrochemical abilities, including reaction intensity charge transfer. More reactive sites containing pores oxygen groups beneficial reaction. This offers new way recover cheap electrodes from solutions cyanide-free method industry.