Abstract
Nano–zero–valent iron (nZVI), Fe0, has been successfully used to transform and degrade contaminants in soils and water. Additionally, it has been used as a catalyst to heterogeneously activate persulfate (Na2S2O8, PS ) for the treatment of various contaminants. The nZVI–PS oxidation system has received increasing attention because of its successful use in the treatment of sediments contaminated with recalcitrant organic compounds; treated sediments have improved considerably to meet remediation goals, such as the remediation goal for polycyclic aromatic hydrocarbons (PAHs) . The presence of PAHs in sediments is a major concern because of the risks posed to aquatic ecosystems through bioaccumulation in food chains. To minimize ecological risks posed by contaminated sediments, it is imperative to develop processes that can degrade the sorbed PAHs . Efforts have been focused on identifying the most effective PS oxidant for obtaining the maximum acceptable PAH compound concentration. Moreover, the oxidation of PAHs in sediments by PS along with the simultaneous activation of the PS by nZVI , which is a source of catalytic ferrous iron, has been investigated. The determination and quantification of PAHs in sediment samples were performed using gas chromatography coupled to mass spectrometry (GC-MS). An adequate amount of PS must be present because it is the source of sulfate radicals, which are responsible for the degradation of PAHs . Results have indicated that the addition of a larger amount of nZVI to a PS-slurry system can enhance the PS oxidation process, suggesting that nZVI assists PS in the ex-situ treatment of PAH -contaminated sediments. Thus, nZVI -assisted PS is a promising choice for organic compound treatment for environmental remediation. This paper presents a study on magnetic nanoparticles and the heterogeneous PS oxidation of the nanoparticles and organic compounds (PAH -contaminated sediment), conducted in our laboratory.
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Dong, CD., Chen, CW., Hung, CM. (2016). Magnetic Nanoparticles and Their Heterogeneous Persulfate Oxidation Organic Compound Applications. In: Parinov, I., Chang, SH., Topolov, V. (eds) Advanced Materials. Springer Proceedings in Physics, vol 175. Springer, Cham. https://doi.org/10.1007/978-3-319-26324-3_2
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