Thermal desorption technology at low temperatures has been extensively researched. However, the challenge remains in maintaining soil ecological function while effectively removing PAHs from contaminated soil using this method. Based on the gas hammer fragmentation concept, this study presents the strategy of gas stripping (steam extraction) coupled with microwave remediation. A multifunctional bluecoke-based modifier (MnO₂/KHCO₃@BC) was prepared followed by an investigation on the removal effect, soil characteristics and remediation mechanism of MnO₂/KHCO₃@BC-assisted microwave remediation of pyrene (PAHs model) contaminated soil. The research findings indicate that MnO₂/KHCO₃@BC is more effective in generating oxygen vacancies, facilitating surface electron transfer, and enhancing the oxidation effect of ROS on pyrene compared to KHCO₃@BC and MnO₂@BC. Despite having slightly inferior electromagnetic properties to BC, MnO₂/KHCO₃@BC could achieve a microwave remediation temperature of approximately 300 °C under optimal experimental conditions. MnO₂/KHCO₃@BC demonstrated remarkable pyrene removal efficiency with a maximum removal rate of 98.34%, making it an ideal candidate for pyrene remediation. Moreover, the remediated soil exhibited a weakly acidic nature, with a significant decrease in particle size and a substantial increase in potassium content. The study also highlighted a novel synergistic mechanism of ''microwave heating - gas stripping - oxidation,'' which can efficiently remove most of the pyrene adsorbed inside and outside of soil particles and degrade it into low-toxic and small-molecule organic matter, CO₂, and H₂O. Overall, the findings of this study could hold potential significance for upcoming endeavours concerning polluted industrial areas.

低温热脱附技术已得到广泛研究。然而，如何利用这种方法有效去除污染土壤中的多环芳烃，同时保持土壤生态功能仍面临挑战。基于气锤破碎概念，本研究提出了气提（蒸汽提取）与微波修复相结合的策略。制备了多功能蓝焦基改性剂(MnO ₂ /KHCO ₃ @BC)，并研究了MnO ₂ /KHCO ₃ @BC辅助微波修复芘(PAHs模型)污染的去除效果、土壤特性及修复机理。土壤。研究结果表明MnO ₂ /KHCO ₃与KHCO ₃ @BC和MnO ₂ @BC相比，@BC更能有效产生氧空位，促进表面电子转移，增强ROS对芘的氧化作用。尽管其电磁性能稍差于BC，但MnO ₂ /KHCO ₃ @BC在最佳实验条件下可以实现约300℃的微波修复温度。_二氧化锰/KHCO ₃@BC表现出显着的芘去除效率，最大去除率为98.34%，使其成为芘修复的理想选择。此外，修复后的土壤表现出弱酸性，颗粒尺寸显着减小，钾含量大幅增加。该研究还提出了一种新颖的“微波加热-气提-氧化”协同机制，可以有效去除土壤颗粒内外吸附的大部分芘，并将其降解为低毒、小分子有机物， CO ₂和H ₂ O。总体而言，这项研究的结果对于今后有关污染工业区的努力具有潜在意义。