摘要
通过线性极化、循环伏安电位扫描、恒电流阶跃等电化学测试方法 ,研究了纯金在硫脲溶液中的溶解过程 ,在亚硫酸存在的硫脲溶液中 ,金阳极氧化的峰电位负移 ,峰电流增大 ,促进金的阳极过程 ,确定金阳极过程的钝化原因是金电极表面吸附元素硫所致。电化学研究表明 ,硫脲体系中亚硫酸促进金阳极过程的机理是亚硫酸参与了反应过程 ,与硫脲的氧化产物发生了还原反应 ,减少了硫脲的不可逆降解 ,提出了亚硫酸在硫脲浸金过程中的电化学还原—催化溶解机理。
The electrochemistry of gold electrode in thiourea solution has been studied by using electrochemical techniques,such as Potentiodynamic,Voltammogram and Current step.The addition of surfur dioxide presents a very positive effect on the anodic process of gold electrode.The anodic oxidation rate of gold is 5 times faster than in the absence of surfur dioxide.The results show that the passivation of gold electrode is attributed to the accumulation of surfur at the surface of gold.Based on the results,a electrochemical-catalytical reduction mechanism has been proposed to identify the anodic oxidation of gold in thiourea solution.The rate of anodic oxidation in thiourea is,therefore,increased by entrance of surfur dioxide which increases the stability and effective concentration of thiourea.
出处
《有色金属（选矿部分）》
CAS
北大核心
2002年第5期33-36,共4页
Nonferrous Metals（Mineral Processing Section）
基金
全国优秀博士论文专项基金资助项目
