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<p>In this experiment, a rotating dielectric barrier discharge (DBD) reactor was designed to remediate atrazine (ATZ) contaminated soil. The purpose of rotation is to stir the soil in the reactor, realize the uniform contact reaction between the soil and plasma, and increase its remediation ability. The effects of gas flow rate, initial concentration, soil particle size and persulfate (PS) dosage on the degradation efficiency of ATZ in soil were discussed. The experimental results showed that the degradation efficiency of ATZ in soil was the best after 1&#xa0;mmol/L PS was 77.57%, which was 20.31% higher than that of DBD alone. The more PS dosage was added, the better the experimental removal efficiency was. After 25&#xa0;min of treatment, the degradation efficiency of DBD plasma was 41.53% higher than that achieved by ozone alone. Through Fukui function analysis, condensed dual descriptor (CDD), Fourier Transform Infrared Spectroscopy (FTIR), and mass spectrometry, the primary degradation pathways were inferred to be dichlorination hydroxylation, alkyl oxidation, dealkylation, and dechlorination. Finally, Toxicological analyses indicate that both the acute and chronic toxicity of the by-products are reduced to different degrees compared with ATZ. These findings provide a foundation for optimizing plasma-based soil remediation systems and suggest that future research should focus on scaling up rotary DBD reactors, exploring synergistic effects with other oxidants.</p>

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Degradation mechanism and product analysis of rotary DBD synergistic persulfate degradation of atrazine in soil

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • X. Shen,
  • J. Sun,
  • J. Zhang,
  • J. Gu,
  • X. Gao

摘要

In this experiment, a rotating dielectric barrier discharge (DBD) reactor was designed to remediate atrazine (ATZ) contaminated soil. The purpose of rotation is to stir the soil in the reactor, realize the uniform contact reaction between the soil and plasma, and increase its remediation ability. The effects of gas flow rate, initial concentration, soil particle size and persulfate (PS) dosage on the degradation efficiency of ATZ in soil were discussed. The experimental results showed that the degradation efficiency of ATZ in soil was the best after 1 mmol/L PS was 77.57%, which was 20.31% higher than that of DBD alone. The more PS dosage was added, the better the experimental removal efficiency was. After 25 min of treatment, the degradation efficiency of DBD plasma was 41.53% higher than that achieved by ozone alone. Through Fukui function analysis, condensed dual descriptor (CDD), Fourier Transform Infrared Spectroscopy (FTIR), and mass spectrometry, the primary degradation pathways were inferred to be dichlorination hydroxylation, alkyl oxidation, dealkylation, and dechlorination. Finally, Toxicological analyses indicate that both the acute and chronic toxicity of the by-products are reduced to different degrees compared with ATZ. These findings provide a foundation for optimizing plasma-based soil remediation systems and suggest that future research should focus on scaling up rotary DBD reactors, exploring synergistic effects with other oxidants.