植物酚酸多效强化Fenton氧化修复工业场地土壤中多环芳烃的机制研究

铁络合Fenton是突破传统Fenton在有机污染土壤修复中酸性限制的重要手段。本项目紧跟国家《土壤污染防治行动计划》重大需求牵引，针对铁络合Fenton氧化中现有络合剂低效、二次污染等不足，提出植物酚酸多效强化Fenton氧化降解工业场地土壤中PAHs的新型修复方法。环境友好的植物酚酸具有络合Fe3+，稳定H2O2和提高PAHs解吸量的潜在优势，能进一步解决Fe2+循环受限问题，达到多效强化Fenton氧化的目的。本项目拟采用批处理法明确影响土壤PAHs氧化效能的关键因子。通过GC-MS、HPLC-MS、EPR、ATR-FTIR等技术手段，解析络合剂强化途径、PAHs降解产物、活性物种特征及生成路径，阐明络合剂强化机制和PAHs氧化降解机制，最终揭示植物酚酸多效强化Fenton氧化降解土壤PAHs的化学反应机制。本项目研究结果将为工业场地PAHs污染土壤的修复治理提供理论指导和技术支持。

Iron complex Fenton is an important mean to break through the traditional Fenton's acid limitation in the remediation of organic contaminated soil. This project closely follows the major needs of the National Action Plan for Soil Pollution Prevention and Control, and a new multi-effect enhanced remediation of PAHs-contaminated soil from industrial site by plant phenolic acids modified Fenton oxidation is proposed for solving the inefficiency and secondary pollution of the current complexing agents. Environmentally friendly plant phenolic acid has the potential advantages of complexing Fe3+, stabilizing H2O2 and accelerating desorption of PAHs from soil, and can further solve limited Fe2+ cycle, which thus achieve the multi-effect enhanced Fenton oxidation purpose. This project intends to clarify the key influence factors on oxidation efficiency of PAHs in soil by the batch experimental method. To shed light on the enhancing mechanism of complexing agents and the degradation mechanism of PAHs, the complexing agent enhancing methods, PAHs degradation products, the active species characteristics and generation pathways are elucidated by GC-MS, HPLC-MS, EPR, ATR-FTIR, etc, which finally reveals the chemical reaction mechanism of PAHs degradation in industrial site soil by plant phenolic acids multi-effect enhanced Fenton oxidation. The results will provide theoretical guidance and technical support for the remediation of PAHs contaminated soil in industrial sites.