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- W2594814555 abstract "Persulfate (S2O82-)-based in situ chemical oxidation (ISCO) has gained more attention in recent years due to the generation of highly reactive and selective sulfate radical (SO4•-). This study examined the effects of important groundwater chemical parameters, i.e., alkalinity, pH, and chloride on benzene degradation via heterogeneous persulfate activation by three Fe(III)- and Mn(IV)-containing aquifer minerals: ferrihydrite, goethite, and pyrolusite. A comprehensive kinetic model was established to elucidate the mechanisms of radical generation and mineral surface complexation. Results showed that an increase of alkalinity up to 10 meq/L decreased the rates of persulfate decomposition and benzene degradation, which was associated with the formation of unreactive surface carbonato complexes. An increase in pH generally accelerated persulfate decomposition due to enhanced formation of reactive surface hydroxo complexation. A change in the chloride level up to 5 mM had a negligibly effect on the reaction kinetics. Kinetics modeling also suggested that SO4•- was transformed to hydroxyl radical (HO•) and carbonate radical (CO3•-) at higher pHs. Furthermore, the yields of two major products of benzene oxidation, i.e., phenol and aldehyde, were positively correlated with the branching ratio of SO4•- reacting with benzene, but inversely correlated with that of HO• or CO3•-, indicating that SO4•- preferentially oxidized benzene via pathways involving fewer hydroxylation steps compared to HO• or CO3•-." @default.
- W2594814555 created "2017-03-16" @default.
- W2594814555 creator A5000432967 @default.
- W2594814555 creator A5008353288 @default.
- W2594814555 creator A5019421112 @default.
- W2594814555 creator A5073623028 @default.
- W2594814555 date "2017-03-17" @default.
- W2594814555 modified "2023-10-16" @default.
- W2594814555 title "Mechanisms on the Impacts of Alkalinity, pH, and Chloride on Persulfate-Based Groundwater Remediation" @default.
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- W2594814555 doi "https://doi.org/10.1021/acs.est.6b04849" @default.
- W2594814555 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28263583" @default.
- W2594814555 hasPublicationYear "2017" @default.
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