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<p>Selenium-rich wastewater from the metallurgical and chemical industries poses environmental risks and leads to resource loss. Conventional treatment technologies often suffer from poor selectivity, high chemical consumption, and difficulties in obtaining high-purity recoverable selenium. In this study, a novel electrochemical method for selenium extraction from wastewater has been proposed. Mechanistic investigations revealed that the reduction of Se(IV) occurs through a straightforward electrochemical pathway that converts selenous acid to elemental selenium on the cathode surface, while unwanted side reactions are effectively suppressed by controlling the operating potential. Under optimized conditions of 33.33 A/m<sup>2</sup> for 25 min, metallic selenium with a purity of over 99.9% could be obtained from selenium-containing wastewater, with a selenium recovery rate of 82%. The total energy consumption reaches 337 Wh/kg Se. SEM, EDS, and XRD analyses verified the uniform morphology, complete crystal structure, and high purity (3N grade) of the recovered product. This work demonstrates a fast, selective, and environmentally friendly strategy for selenium resource recovery, offering strong potential for industrial application.</p>

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Electrochemical Recovery of Elemental Selenium from Solution: Process Performance and Mechanistic Insights

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Xueshuang Gong,
  • Yichao Yang,
  • Shiheng Zhang,
  • Guozheng Zha,
  • Wenlong Jiang

摘要

Selenium-rich wastewater from the metallurgical and chemical industries poses environmental risks and leads to resource loss. Conventional treatment technologies often suffer from poor selectivity, high chemical consumption, and difficulties in obtaining high-purity recoverable selenium. In this study, a novel electrochemical method for selenium extraction from wastewater has been proposed. Mechanistic investigations revealed that the reduction of Se(IV) occurs through a straightforward electrochemical pathway that converts selenous acid to elemental selenium on the cathode surface, while unwanted side reactions are effectively suppressed by controlling the operating potential. Under optimized conditions of 33.33 A/m2 for 25 min, metallic selenium with a purity of over 99.9% could be obtained from selenium-containing wastewater, with a selenium recovery rate of 82%. The total energy consumption reaches 337 Wh/kg Se. SEM, EDS, and XRD analyses verified the uniform morphology, complete crystal structure, and high purity (3N grade) of the recovered product. This work demonstrates a fast, selective, and environmentally friendly strategy for selenium resource recovery, offering strong potential for industrial application.