• 关键词：硫  硫化物  钝化  电解

• 基金项目：国家自然科学基金

• 易清风
• 湘潭工学院化工系, 湘潭 411201

• 陈启元
• 中南工业大学化学系

• 张平民
• 中南工业大学化学系

• 摘要：报道了直接电解硫化氢碱性水溶液回收硫磺和氢气的研究。实验结果表明,控制一定电流密度、阳极电势和电解温度能有效地降低阳极产物硫在电极表面的沉积而引起的阳极钝化。讨论了阳极液组成对阳极钝化和硫的含氧酸根物质生成的影响。循环伏安法研究表明,硫化物的氧化包含多个平行的电化学氧化过程,正向扫描和负向扫描时均出现多硫化物中间体.

• Abstract：The production of sulfur and hydrogen by direct electrolysis of H₂S in aqueous alkaline solution is reported.The experimental results showed that the anode passivation caused by deposition of sulfur at anode can be effectively inhibited by controlling current density, anodic potential and electrolytic temperature. Effects of anolyte compositions on anode passivation and formations of sulfur oxyanions are discussed.Cyclic voltammograms indicated that electrochemical oxidations of HS^- and S^2- involve parallel oxidation of two or more electroactive species, and that polysulfides are present as intermediates on both positive going scan and negative going scan.

• Key words：sulfur  sulfide  passivation  electrolysis

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