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| Adsorption performance and mechanism of heavy metals by manganese-loaded carbonized soil |
| YU Zhen-zhen, YANG Yi-fan, GAO Hang, WANG Ming-xin |
| School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China |
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Abstract In this study, a combination of permanganate pretreatment and oxygen-limited pyrolysis was used to treat and convert petroleum-contaminated soil (PCS) into carbonized soil loaded with manganese oxides (Mn-CS). Compared with the carbonized soil (CS) obtained by solo pyrolysis treatment, the Mn-CS is rough and porous, with higher specific surface area, micropore volume and lower leaching risk of soluble organic matter. The adsorption properties of Mn-CS for heavy metals can be well fitted by Langmuir isotherm model and pseudo-second-order kinetic model. The maximum theoretic adsorption capacity of Mn-CS for Pb2+, Cu2+, Zn2+and Cd2+is 420.54, 81.19, 79.73 and 26.40mg/g, respectively. The adoption processes are dominated by single-layer chemical adsorption. The heavy metals adsorbed by Mn-CS are mainly bound to Fe/Mn oxides, followed by bound to carbonate and organic matter. The adsorption mechanism includes surface complexation, coprecipitation and mineral binding/precipitation. Permanganate pretreatment significantly enhances the adsorption performance by increasing carbonate, manganese oxides and amorphous carbon on the surface of soil. Thus, the adsorption capacity of Mn-CS for heavy metals is synergistically improved. This study provided a new method to realize the value-added transformation of PCS, which is supposed to promote PCS treatment mode from up-to-standard remediation to resource utilization.
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Received: 01 December 2023
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