Abstract
Pyrolysis can rapidly remediate petroleum-contaminated soil (PCS) and recover some liquid oil, but less attention has been paid to the reuse potential and strategy of the remediated carbonized soil (RCS). In this study, RCS was used as adsorbent to recover Mn2+, Ni2+, and Cu2+ from wastewater. The solid residue (RCS-Me) was reused to activate peroxysulphate oxidation. The total petroleum hydrocarbons and dissolved organic matter can be completely removed by pyrolysis at 500 °C for 3 h. The maximum adsorption capacities of RCS for Cu2+, Ni2+, and Mn2+ are 65.96, 50.75, and 57.95 mg/g, respectively. Sequential extraction analysis shows that transition heavy metals are mainly bound to carbonate and Fe/Mn oxides. RCS and RCS-Me can effectively activate peroxysulphate to degrade aniline, and the activation performance and reusability of RCS-Me are remarkably better than RCS. The nonradical path dominates in the oxidation process, and the main species are hole and 1O2. Electron paramagnetic resonance and linear sweep voltammetry analysis show that hole improves the activation efficiency mainly by accelerating direct electron transfer, while the oxygen-containing groups and oxygen vacancies may activate peroxysulphate to generate 1O2.The strategy can simultaneously realize efficient remediation of PCS and sequential resource utilization of the remediated soil.
Published Version
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