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<p>Chlorine is a common harmful element in industrial wastewater, characterized by its high water solubility and non-biodegradability. Removing chloride ions from wastewater is a challenging task. This study explores the mechanism of removing chloride ions using sulfite and copper ions together. The reaction kinetics and free radicals involved were also studied in detail. Under optimal conditions, chloride ion concentration dropped from 3545 to 197.09&#xa0;mg/L, achieving a 94.44% removal rate. The removal process follows first-order and second-order kinetic equations, with activation energies of 22.29&#xa0;kJ/mol and 69.11&#xa0;kJ/mol, respectively. The dechlorination slag was analyzed using XRD, SEM-EDS, and XPS to determine its composition, morphology, and valence states. Free radicals in the sodium sulfite solution were identified by ESR spectroscopy. The movement of the reaction system was observed using a high-speed camera. Based on thermodynamic data and changes in ion concentration, the mechanism of chloride ion removal using sodium sulfite and copper sulfate was elucidated.</p>

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Research on Efficient Chlorine Removal via the Synergistic Action of Sulfite and Copper Ions

  • 期刊论文

  • 发表日期：

    2025年6月26日

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  • Baoxin Liu,
  • XiaoQian Che,
  • WanTao Ning,
  • Jing Li,
  • ZhanQing Lu

摘要

Chlorine is a common harmful element in industrial wastewater, characterized by its high water solubility and non-biodegradability. Removing chloride ions from wastewater is a challenging task. This study explores the mechanism of removing chloride ions using sulfite and copper ions together. The reaction kinetics and free radicals involved were also studied in detail. Under optimal conditions, chloride ion concentration dropped from 3545 to 197.09 mg/L, achieving a 94.44% removal rate. The removal process follows first-order and second-order kinetic equations, with activation energies of 22.29 kJ/mol and 69.11 kJ/mol, respectively. The dechlorination slag was analyzed using XRD, SEM-EDS, and XPS to determine its composition, morphology, and valence states. Free radicals in the sodium sulfite solution were identified by ESR spectroscopy. The movement of the reaction system was observed using a high-speed camera. Based on thermodynamic data and changes in ion concentration, the mechanism of chloride ion removal using sodium sulfite and copper sulfate was elucidated.