中华医学超声杂志

应用化学 ›› 1990, Vol. 0 ›› Issue (4): 52-56.

• 研究论文 • 上一篇    下一篇

金在酸性硫脲溶液中的阳极溶解过程

薛祚霖, 王福, 成凤英   

  1. 中国科学院长春应用化学研究所 长春 130022
  • 收稿日期:1989-07-27 修回日期:1989-12-01 出版日期:1990-08-10 发布日期:1990-08-10
  • 基金资助:
    国家自然科学基金

ON THE ANODIC DISSOLUTION OF GOLD IN ACIDIC THIOUREA SOLUTIONS

Xue Zuolin, Wang Fu, Cheng Fenging   

  1. Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022
  • Received:1989-07-27 Revised:1989-12-01 Published:1990-08-10 Online:1990-08-10

PDF

334

摘要： 采用循环伏安法、旋转金盘电极和库仑电解等方法研究了金在酸性硫脲(TU)溶液中的阳极溶解过程。提出了金的阳极溶解机构。认为表面的Au(TU)ads+的“化学溶解”步骤是过程的控制步骤。由此解释了旋转金盘电极的极化曲线出现电流峰以及金的溶解速度出现极大的原因。

关键词: 金, 硫脲, 阳极溶解

Abstract: By means of linear potential sweep voltammetry and rotating disk electrode, togatherwith coulometric electrolysis, the anodic dissolution of gold in acidic thiourea solutionswere studied. From the experimental results, it is proposed that the anodic dissolution ofgold proceeds according to the following mechanism:Au + TU ⇔ Au(TU)ads (1)Au(TU)ads⇔Au(TU)+ads +e (2)Au(TU)+ads + TU→Au(TU)+2 (3)in which (3) is the rate-determining step. The existence of a maximum dissolution ratein the used potential range can be explained by this mechanism.

Key words: gold, thiourea, anodic dissolution

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