AI Article Synopsis
- In situ chemical oxidation (ISCO) is a method used to clean up contaminated soil and groundwater, and molecular oxygen (O) activated by aquifer materials shows promise for effectively removing pollutants.
- This review focuses on the use of iron-based materials for activating O due to their strong catalytic abilities, availability, and environmental benefits, detailing various types such as zero-valent iron and iron oxides.
- The mechanisms of O activation, including electron transfer and the formation of reactive oxygen species, are explored, alongside the impact of Fe atom coordination and organic ligands on the process, enhancing understanding for better remediation strategies.
Article Abstract
In situ chemical oxidation (ISCO) is commonly used for the remediation of contaminated sites, and molecular oxygen (O) after activation by aquifer constituents and artificial remediation agents has displayed potential for efficient and selective removal of soil and groundwater contaminants via ISCO. In particular, Fe-based materials are actively investigated for O activation due to their prominent catalytic performance, wide availability, and environmental compatibility. This review provides a timely overview on O activation by Fe-based materials (including zero-valent iron-based materials, iron sulfides, iron (oxyhydr)oxides, and Fe-containing clay minerals) for degradation of organic pollutants. The mechanisms of O activation are systematically summarized, including the electron transfer pathways, reactive oxygen species formation, and the transformation of the materials during O activation, highlighting the effects of the coordination state of Fe atoms on the capability of the materials to activate O. In addition, the key factors influencing the O activation process are analyzed, particularly the effects of organic ligands. This review deepens our understanding of the mechanisms of O activation by Fe-based materials and provides further insights into the application of this process for in situ remediation of organic-contaminated sites.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11598522 | PMC |
| http://dx.doi.org/10.3390/toxics12110773 | DOI Listing |
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