Pyrene contaminated soil remediation using microwave/magnetite activated persulfate oxidation
| Autor: | Tiecheng Wang, Hanzhong Jia, Hongwen Sun, Dan Wu, Ying Zhang, Guangzhou Qu, Hongshuai Kan, Peng Zhang |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
Pyrenes
Environmental Engineering Environmental remediation Health Toxicology and Mutagenesis Public Health Environmental and Occupational Health General Medicine General Chemistry Contamination Persulfate Pollution Soil contamination Ferrosoferric Oxide Soil chemistry.chemical_compound chemistry Environmental chemistry Soil water Humans Soil Pollutants Environmental Chemistry Degradation (geology) Pyrene Microwaves Environmental Restoration and Remediation Magnetite |
| Zdroj: | Chemosphere. 286:131787 |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2021.131787 |
| Popis: | Polycyclic aromatic hydrocarbons (PAHs) are important mutagen prevalent in the contaminated sites, bringing potential risks to human health. Iron oxides are important natural components in soils. Pyrene removal in soil using persulfate (PS) oxidation activated by microwave (MW) and magnetite (Fe3O4) was investigated. Fe3O4 significantly promoted pyrene removal in the soil; 91.7 % of pyrene was degraded within 45 min treatment. Pyrene removal rate in the Fe3O4/MW/PS system was 5.18 and 3.00 times higher than that in the Fe3O4/PS and MW/PS systems. Increasing in Fe3O4 dosage, PS concentration, MW temperature, and soil moisture content in the selected range were conducive for pyrene degradation. SO4•−, •OH, O2•−, and 1O2 were responsible for pyrene degradation, and the conversion of Fe (Ⅱ) in the Fe3O4 to Fe (Ⅲ) contributed to the formation of O2•− and 1O2. Characteristic bands of pyrene were more obviously destroyed by the Fe3O4/MW/PS oxidation, in comparison with MW/PS oxidation. Ring hydroxylation and ring-opening reactions were the main degradation pathways of pyrene. The toxicities of the formed byproducts were significantly reduced after treatment. This study provided a promising option for pyrene contaminated soil remediation. |
| Databáze: | OpenAIRE |
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