Water Decontamination by Reactive High-Valent Iron Species
DOI:
https://doi.org/10.5281/zenodo.14031455Keywords:
Oxidants, EOCs, Water Decontamination, High-valent speciesAbstract
The occurrence of emerging organic contaminants (EOCs) in water bodies has received increasing attention worldwide. EOCs, such as pharmaceuticals and pesticides, when present in trace concentrations, cannot be effectively removed by conventionally designed treatment processes inmost wastewater treatment plants. Therefore, advanced oxidation processes (AOPs) have been developed as promising alternatives for trace-level EOC elimination using radicals (e.g., hydroxyl radicals and sulfate radicals) and non-radical pathways. However, these reactive species are generally nonselective and also exhibit excellent reactivity with background water constituents, leading to excess consumption of oxidants and the possible generation of toxic secondary pollutants . Accordingly, selective oxidants have recently become a subject of considerable interest, mainly including singlet oxygen and high-valent metal species . They could preferentially attack electron-rich moieties, resulting in selective degradation of EOCs. Reactive high-valent iron species include ferrate [Fe(VI)], Fe(IV), and Fe(V), and are often referred to as active ferrate species. They possess attractive chemical properties and have raised renewed interest in iron-based catalytic AOPs to remove EOCs in practical water decontamination.
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