Sulfite activation by oxidized pyrite for dye degradation assisted by oxygen

Because pyrite is easily oxidized, the catalytic performance of a pyrite-peroxymonosulfate (PMS) or peroxydisulfate (PDS) activation system will be significantly affected due to the low activation of PMS or PDS by Fe 3+ in practical applications. Herein, sulfite was selected to react with oxidized p...

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Bibliographic Details
Published in:New journal of chemistry 2022-02, Vol.46 (6), p.2618-2626
Main Authors: He, Guangjun, Zhong, Dengjie, Xu, Yunlan
Format: Article
Language:English
Subjects:
Decoloring
Degradation
Dyes
Iron
Pollutants
Pyrite
Rhodamine
Sodium sulfite
Wastewater treatment
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Summary:Because pyrite is easily oxidized, the catalytic performance of a pyrite-peroxymonosulfate (PMS) or peroxydisulfate (PDS) activation system will be significantly affected due to the low activation of PMS or PDS by Fe 3+ in practical applications. Herein, sulfite was selected to react with oxidized pyrite (OP) to generate radicals for the degradation of dye wastewater in the presence of oxygen because both Fe 2+ and Fe 3+ can be used as efficient activators of sulfite. Under the optimal conditions, an OP/sodium sulfite (SS) system achieved high-efficiency removal of rhodamine B (RB) in the wide pH range of 4.0-9.0. In the OP/SS system, sulfite was mainly activated by dissolved iron. Moreover, by comparison with an acid-washed pyrite (AWP)/SS system, Fe( iii ) on the surface of pyrite, instead of Fe( ii ), acted as the active site of sulfite activation in the heterogeneous reaction of the OP/SS system. In addition, good reusability of OP and high decolorization of different dye pollutants made the OP/SS system possibly suitable for application in dye wastewater treatment. Fe( iii ) on the surface of pyrite, instead of Fe( ii ), acted as the active site of sulfite activation.
ISSN:1144-0546
1369-9261
DOI:10.1039/d1nj04790f