Polycyclic aromatic hydrocarbons (PAHs) contaminated sites have attracted worldwide concern due to their carcinogenic, mutagenic, and teratogenic natures. Crystallographic manganese oxides (Mn_xO_y) are ubiquitous in soils. In this study, Mn_xO_y enhanced PAHs contaminated soil remediation in a microwave activated persulfate (MW/PS) system was conducted, and pyrene was selected as a target pollutant. Significant enhancement performance on pyrene removal was observed after adding Mn_xO_y, which ranked as β-MnO₂ > α-MnO₂ > γ-MnO₂ > Mn₂O₃. Pyrene removal efficiency was enhanced from 65.7% to 85.6% within 15 min of treatment when β-MnO₂ dosage increased from 0 to 0.1 g. Mn_xO_y in the MW/PS system improved the production of active substances and converted radical process into non-radical process via conversion of Mn(IV) to Mn(III) and Mn-O-Mn to Mn-O-X. ¹O₂ played significant roles in pyrene degradation, whereas the presence of β-MnO₂ alleviated the shielding effects of SO₄^•− and ^•OH scavengers. Pyrene molecular structures were destroyed, and some ring-opening and/or lower ring byproducts were generated. Residual toxicity of pyrene and its degradation byproducts was predicted. This work provided a potential pathway to promote PAHs contaminated soil remediation via Mn_xO_y enhanced MW/PS oxidation, and highlighted new insights into the mechanism of PS activation by metal oxides.

多环芳烃（PAHs）污染场所由于其致癌，诱变和致畸性质而引起了全世界的关注。结晶锰氧化物（Mn _x O _y）在土壤中无处不在。在这项研究中，进行了Mn _x O _y增强的微波活化过硫酸盐（MW / PS）系统中污染的PAHs修复，并选择pyr作为目标污染物。加入Mn _x O _y后pyr去除效果显着提高，依次为β- MnO ₂ > α- MnO ₂ > γ- MnO ₂ > Mn。₂ O ₃。当β- MnO ₂剂量从0克增加到0.1克时，treatment的去除效率在处理15分钟内从65.7％提高到85.6％。MW / PS系统中的Mn _x O _y改善了活性物质的产生，并通过将Mn（IV）转化为Mn（III）和Mn-O-Mn转化为Mn-OX将自由基过程转化为非自由基过程。¹ O ₂在pyr降解中起重要作用，而β- MnO ₂的存在减轻了SO ₄ ^•-和^•的屏蔽作用OH清道夫。molecular的分子结构被破坏，并且产生了一些开环和/或低级环副产物。预测了pyr及其降解副产物的残留毒性。这项工作提供了通过Mn _x O _y增强MW / PS氧化促进PAHs污染土壤修复的潜在途径，并强调了对金属氧化物激活PS机理的新见解。