Conventional remediation technologies for petroleum-contaminated soil (PCS) usually consider harmless treatment as the primary goal, ignoring the reutilization value of PCS derivatives; they generally face the dilemma of high cost or low efficiency. In this study, PCS was treated by ferrate-assisted pyrolysis for highly efficient remediation and transformation to Fe-loaded carbonized soil (Fe-CS) as a heavy metal adsorbent. The total petroleum hydrocarbons and dissolved organic matter in the obtained Fe-CS were almost completely removed. When the pyrolysis temperature was 500 °C, retention time was 30 min, and 10 % K₂FeO₄ was added, The Langmuir model showed that the maximum adsorption capacities of Pb²⁺ and Cu²⁺ of Fe-CS were 347.9 and 106.3 mg/g, respectively. The adsorption processes of Pb²⁺ and Cu²⁺ onto Fe-CS fit the pseudo-second and pseudo-first kinetic models, respectively. X-ray diffractometer (XRD), Raman spectroscopy, Fourier transform infrared (FTIR), Brunauer–Emmett–Teller (BET), and X-ray photoelectron spectroscopy (XPS) were used to characterize the adsorbent. XPS analysis showed that iron oxide, metal carbonate, and CO on the Fe-CS surface were significantly increased compared with the carbonized soil (CS) obtained by pyrolysis alone. In addition, the BET specific surface area and micropore volume of Fe-CS are higher than those of CS. The chemical specifications of the heavy metals in Fe-CS showed that they are mainly bound to carbonates and iron oxides. This study provides an innovative method for the simultaneous realization of the efficient remediation and high-value reuse of PCS.

传统的石油污染土壤（PCS）修复技术通常以无害化处理为首要目标，忽视了PCS衍生物的再利用价值；他们普遍面临成本高或效率低的困境。在这项研究中，通过高铁酸盐辅助热解处理 PCS，以高效修复并转化为负载铁碳化土壤 (Fe-CS) 作为重金属吸附剂。得到的 Fe-CS 中的总石油烃和溶解的有机物几乎被完全去除。当热解温度为500 ℃，保留时间为30 min，加入10 % K ₂ FeO ₄时，Langmuir模型显示Pb ²⁺和Cu ^{2+的最大吸附量}Fe-CS 的含量分别为 347.9 和 106.3 mg/g。^{Pb 2+}和Cu ²⁺在Fe-CS上的吸附过程分别符合准第二和准第一动力学模型。使用 X 射线衍射仪 (XRD)、拉曼光谱、傅里叶变换红外 (FTIR)、Brunauer-Emmett-Teller (BET) 和 X 射线光电子能谱 (XPS) 来表征吸附剂。XPS 分析表明，氧化铁、金属碳酸盐和 C与仅通过热解获得的碳化土壤 (CS) 相比，Fe-CS 表面上的 O 显着增加。此外，Fe-CS的BET比表面积和微孔体积均高于CS。Fe-CS中重金属的化学指标表明它们主要与碳酸盐和氧化铁结合。本研究为同时实现PCS的高效修复和高价值再利用提供了一种创新方法。