硫化钠在旋转盘环电极上的电化学氧化

Electrochemical Oxidation of Sodium Sulfide on Rotating Ring-disc Electrode

采用旋转盘环铂电极研究了硫化钠氧化的电化学过程。硫化钠解离产生的HS- 离子在圆盘电极上氧化 ,而在环电极上被还原。实验结果表明 ,当圆环电极的旋转频率为 2 0Hz、圆盘电极上的电压大于 -0 .15V时 ,HS- 离子在圆盘电极上通过一系列电化学反应氧化生成S0 ,其中间产物包括Sx2 - 或S22 - ;在环电极上施加 -0 .8V电压后 ,S0 在环电极上被还原。旋转圆环铂电极的循环伏安扫描曲线表明 ,硫化钠的氧化过程产生了中间产物S2 - x ,进一步氧化形成元素S0 。

The electrochemical process of oxidation of soldium sulfide(Na 2S) was investigated using a rotating ring(Pt) disc(Pt) electrode. HS - ions liberated by addition of Na 2S to flotation slurry were oxidated on the disc electrode and reduced on the ring electrode. The test results have shown that when the ring electrode rotates at a frequency of 20 Hz and the disc electrode's potentical exceeds -0.15 V, HS - ions are oxidized to form S 0 by a series of electrochemical reactions on the disc electrode, and their intermediate products include S 2- x or S 2- 2. When -0.8 V is applied to the ring electrale, S 0 is reduced on it: The scanning curves of the rotating ring disc electrode show that the intermediate products, S 2- x , forming in oxidation of Na 2S are oxidized furthor to form elemental S 0.