Dual-pathway degradation of TNT in soil by Fe0-activited persulfate: From mechanism to pilot-scale application

文献类型： 外文期刊

第一作者： Li, You

作者： Li, You;Luo, Junpeng;Liao, Xiaoyong;Cao, Hongying;Li, Haonan;Li, You;Luo, Junpeng;Liao, Xiaoyong;Cao, Hongying;Li, Haonan;Luo, Junpeng;Pan, Junting

作者机构：

关键词： Trinitrotoluene (TNT); Persulfate; Chemical oxidation; Mechanism; Soil

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.2； 五年影响因子：13.5 ）

ISSN： 1385-8947

年卷期： 2025 年 520 卷

页码：

收录情况： SCI

摘要： The escalation of international armed conflicts has exacerbated the environmental hazards posed by the leakage and remnants of military energetic compounds, presenting substantial challenges to post-war reconstruction efforts. The development of effective remediation technologies for energetic compound contamination is therefore imperative. This study investigates the degradation effects of various activated persulfate (PS) treatments on soil-bound trinitrotoluene (TNT), exploring the oxidative degradation process and mechanisms under optimal conditions, and conducted a pilot-scale experiment to verify the practical application of the technology. Results indicate that Fe0 activated PS exhibits the highest efficiency in degrading TNT in soil, achieving a removal rate of up to 97.0 % under conditions of a soil-to-water ratio of 1:5, PS:Fe0 = 1:3, initial PS concentration of 0.10 mol/L, pH = 6, and a temperature of 55 degrees C. The oxidation process via Fe0 activated PS generates four active radicals: SO4 center dot- , center dot OH, O2 center dot- , and 1O2, with SO4 center dot- and O2 center dot- playing pivotal roles as key radicals. Postoxidation, the soil exhibits an increase in high-valence iron content, while C-C, C--C, C-H, and C-O fractions decrease. Coupled with mass spectrometry analysis, the study identifies TNT's oxidation intermediates, unveiling two degradation pathways: direct oxidation and reduction-oxidation pathways. Additionally, the pilotscale experiment confirmed that Fe0 activated PS is capable of effectively remediating TNT-contaminated soil. These findings provide deeper insights into the impact, mechanisms, and practical effectiveness of activated PS in degrading TNT in soil, offering a new theoretical foundation and technical approach for remediating soils contaminated by energetic compounds.

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