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Both Fe(IV) and Radicals Are Active Oxidants in the Fe(II)/Peroxydisulfate Process
journal contribution
posted on 2020-02-14, 17:06 authored by Hongyu Dong, Yang Li, Shuchang Wang, Weifan Liu, Gongming Zhou, Yifan Xie, Xiaohong GuanThe
question of whether Fe(IV) or SO4•– is the dominant intermediate in the Fe(II)-activated peroxydisulfate
process [Fe(II)/PDS process] remains unanswered. In this study, besides
Fe(IV), SO4•– and HO• were shown to be produced in the Fe(II)/PDS process by using multiple
probes [dimethyl sulfoxide, methyl phenyl sulfoxide, p-nitrobenzoic acid (p-NBA), and benzoic acid (BA)].
The removal of p-NBA and BA and the influence of
BA on the yield of methyl phenyl sulfone (PMSO2) indicated
that the major oxidizing intermediate changed from Fe(IV) to SO4•–/HO• with an
increase in the PDS/Fe(II) molar ratio at pH 3.0. Fe(IV), SO4•–, and HO• were all involved
in this process at pH 3.0–6.5, but their available amounts
that contributed to abating organic contaminants decreased with an
increase in pH considering the influence of pH on the generation of
PMSO2 and p-hydroxybenzoic acid. Furthermore,
Fe(IV), SO4•–, and HO• contributed differently to abating different organic contaminants
because of the different reactivities of these oxidizing oxidants
toward different organic contaminants. Overall, this study demonstrates
that multiple oxidizing species [Fe(IV), SO4•–, and HO•] are generated in the Fe(II)/PDS process,
which was significant for the application of this process and understanding
the mechanisms of Fe(II)-activated peroxide processes.
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