Journal
CHEMICAL ENGINEERING JOURNAL
Volume 288, Issue -, Pages 806-812Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2015.12.008
Keywords
Activated carbon fibers; Heterogeneous catalyst; Persulfate; Sulfite
Categories
Funding
- State Key Program of National Natural Science of China [51133006]
- National Natural Science Foundation of China [51302246]
- Natural Science Foundation of Ningbo [2015A610047]
- Public Welfare Technology Application Research Project of Zhejiang Province [2015C33018]
- Zhejiang Provincial Natural Science Foundation of China [LY14E030013, LY14E030015]
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In this study, reductive sulfite (S(IV)) was innovatively introduced into activated carbon fibers supported ferric citrate (Cit-Fe@ACFs) and persulfate (PS) process for organic dye removal. The addition of S(IV) enhanced the catalytic elimination rate of organic dye Reactive Red M-3BE from 15.2% to 96.2% in 12 min (k(obs) (pseudo-first-order rate constant) from 0.015 to 0.324 min(-1)). More importantly, the simultaneous removal of S(IV), which is a common inorganic pollutant, was also achieved. This Cit-Fe@ACFs/S (IV)/PS system exhibited superior sustained catalytic ability and distinguished pH-tolerant performance for the simultaneous rapid removal of dyes and inorganic S(IV). Furthermore, the reaction rate constant (k(obs)) increased with the increase of concentration of S(IV) below 1 mM, while decreased over 1 mM. Finally, various radical scavengers were used together with electron paramagnetic resonance spectroscopy to confirm that hydroxyl ((OH)-O-center dot), sulfate (SO4 center dot-) and peroxymonosulfate (SO5 center dot-) radicals served as the major reactive oxygen species in the Cit-Fe@ACF5/S(IV)/PS system. This study provides a promising idea to use polluting S(IV) in sewage treatment for the simultaneous removal of organic and inorganic pollutants. (C) 2015 Elsevier B.V. All rights reserved.
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