Mechanism of gold dissolving in alkaline thiourea solution
- 期刊名字:中南工业大学学报(英文版)
- 文件大小:
- 论文作者:CHAI Li-yuan,WANG Yun-yan
- 作者单位:School of Metallurgical Science and Engineering
- 更新时间:2023-02-26
- 下载次数:次
Reaction mechanism of gold dissolving in alkaline thiourea solution was studied by electrochemical methods, such as cyclic voltammetry, chronopotentiometry, AC impedance, linear sweep voltammetry. Apparent activation energy of anodic process of gold electrode dissolving in alkaline thiourea solution is 14.91 kJ/mol. Rate determining step is the process of gold thiourea complex diffusing away from electrode surface to solution. The results of AC impedance and chronopotentiometry indicate that thiourea adsorbs on gold electrode surface before dissolving in solution. There does not exist proceeding chemical reactions. Formamidine disulfide, the decomposed product of thiourea, does not participate the process of gold dissolution and thiourea complex. Species with electro-activity produced in the process of electrode reaction adsorbs on the electrode surface. In alkaline thiourea solution, gold dissolving mechanism undergoes the following courses: adsorption of thiourea on electrode surface; charge transfer from gold atom to thiourea molecule; Au[SC(NH2)2]ads+ receiving a thiourea molecule and forming stable Au[SC(NH2)2]2+; and then Au[SC(NH2)2]2+diffusing away from the electrode surface to solution, the last step is the rate-determining one.
-
C4烯烃制丙烯催化剂 2023-02-26
-
煤基聚乙醇酸技术进展 2023-02-26
-
生物质能的应用工程 2023-02-26
-
我国甲醇工业现状 2023-02-26
-
JB/T 11699-2013 高处作业吊篮安装、拆卸、使用技术规程 2023-02-26
-
石油化工设备腐蚀与防护参考书十本免费下载,绝版珍藏 2023-02-26
-
四喷嘴水煤浆气化炉工业应用情况简介 2023-02-26
-
Lurgi和ICI低压甲醇合成工艺比较 2023-02-26
-
甲醇制芳烃研究进展 2023-02-26
-
精甲醇及MTO级甲醇精馏工艺技术进展 2023-02-26