Presentation Information
[8p-P02-11]Stable Preparation of Chloroauric Acid Using Thiourea Derivatives via Bipolar Alternating Current Electrolysis
〇Miku Yoshizawa1, Kanamu Hayashi2, Tomohide Takami3, Naoto Kuwamura3 (1.Appl. Chem. Eng., Grad. Sch. Eng., Kogakuin Univ., 2.Dept. Appl. Chem., 3.Div. Liberal Arts, Kogakuin Univ.)
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Scanning Probe Microscope
In recent years, the recovery of precious metals from used electronic devices has attracted attention from the perspectives of urban mining and resource recycling. Among these metals, gold possesses high economic value, making the development of efficient recovery methods essential. Bipolar alternating current (AC) electrolysis is a promising and simple electrochemical technique that requires no external wiring. However, its reaction behavior varies significantly depending on the electrode material and electrolyte conditions, making the reproducible generation of chloroauric acid challenging. In this study, we report that the use of CaCl2 aqueous solution as the electrolyte, combined with the addition of thiourea or methylthiourea during bipolar AC electrolysis, enabled the reproducible and stable dissolution of gold into an aqueous chloroauric acid solution.