Wang Lin, Gao Hang, Wang Mingxin, Xue Jinjuan
School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, PR China.
School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, PR China; Jiangsu Petrochemical Safety and Environmental Protection Engineering Research Center, Changzhou 213164, PR China.
J Hazard Mater. 2022 Feb 15;424(Pt A):127305. doi: 10.1016/j.jhazmat.2021.127305. Epub 2021 Sep 21.
A simple mechanochemical (MC) method is used to treat petroleum-contaminated soil and prepare a heavy metal adsorbent in one step. XRD, Raman, FT-IR, VSM, BET, and XPS were used to characterize the adsorbent. After MC treatment, the dissolved total petroleum hydrocarbons of the adsorbent is less than 1 mg·L, and a porous structure and carbonization phenomenon are evident. The specific surface area and cumulative void volume increase, and the adsorption pore size decreases. On the surface of soil, the percentages of iron oxides, carbonates, CO, -C-O-H, -COOH, and π unsaturated bonds increase. The Langmuir model shows that the maximum adsorption capacity of Pb, Cu, Cd, and Zn are 338.58, 51.61, 32.34, and 25.05 mg·g, respectively. The pseudo-second-order kinetic model fits the Pb adsorption process, indicating the domination of chemical adsorption. GC-MS shows that petroleum hydrocarbons are completely degraded. The Tessier continuous extraction result shows that heavy metals are bound to carbonate, iron manganese oxide, and organic matter. The MC treatment achieves deep cleanup and resource utilization of petroleum-contaminated soil through the formation of amorphous carbon, carbonates, and iron oxides on the surface of soil particles. The material is magnetic and can be recycled when used in wastewater treatment.
采用一种简单的机械化学（MC）方法对石油污染土壤进行处理，并一步制备重金属吸附剂。利用X射线衍射（XRD）、拉曼光谱、傅里叶变换红外光谱（FT-IR）、振动样品磁强计（VSM）、比表面积分析仪（BET）和X射线光电子能谱（XPS）对吸附剂进行表征。经过MC处理后，吸附剂中溶解的总石油烃含量小于1 mg·L，且明显呈现出多孔结构和碳化现象。比表面积和累积孔隙体积增加，吸附孔径减小。在土壤表面，铁氧化物、碳酸盐、CO、-C-O-H、-COOH和π不饱和键的百分比增加。朗缪尔模型表明，Pb、Cu、Cd和Zn的最大吸附容量分别为338.58、51.61、32.34和25.05 mg·g。准二级动力学模型拟合Pb的吸附过程，表明化学吸附起主导作用。气相色谱-质谱联用（GC-MS）显示石油烃已完全降解。Tessier连续萃取结果表明重金属与碳酸盐、铁锰氧化物和有机物结合。MC处理通过在土壤颗粒表面形成无定形碳、碳酸盐和铁氧化物，实现了石油污染土壤的深度净化和资源利用。该材料具有磁性，用于废水处理时可回收利用。
