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- Title
Effects of oxygen and weak magnetic field on Fe/bisulfite system: performance and mechanisms.
- Authors
Xiong, Xinmei; Gan, Jinhong; Zhan, Wei; Sun, Bo
- Abstract
The performance and mechanisms of 4-nitrophenol (4-NP) degradation by the Fe/bisulfite system were systematically investigated for the first time. The evidences presented in this study verified that O was a crucial factor that affected the mechanism of Fe/bisulfite-driven 4-NP degradation. In the Fe/bisulfite/O system, Fe acted as a supplier of Fe to catalyze bisulfite oxidation that induced a chain reaction to produce reactive radicals for 4-NP degradation. While under N purging condition, bisulfite worked as a specified reductant that facilitated the transformation of Fe to nascent Fe ions, which principally accounted for the reductive removal of 4-NP. The application of a weak magnetic field (WMF) efficiently improved the removal rate of 4-NP and did not alter the mechanisms in both Fe/bisulfite/O and Fe/bisulfite/N processes. The secondary radicals, HO, SO , and SO , were considered as the most possible active oxidants contributing to the oxidative removal of 4-NP and even partial mineralization under an oxic condition. Compared with anoxic conditions, the performance removal of 4-NP by the WMF-Fe/bisulfite/O system showed less pH dependence. To facilitate the application of WMF-Fe/bisulfite/O technology in real practice, premagnetization of Fe was employed to combine with bisulfite/O and proved to be an effective and applicable method for 4-NP removal.
- Subjects
NITROPHENOLS; OXYGEN; MAGNETIC fields; OXIDATION; FREE radicals
- Publication
Environmental Science & Pollution Research, 2016, Vol 23, Issue 16, p16761
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-016-6672-7