Fluidized-bed Fenton-like oxidation of a textile dye using natural magnetite

Fluidized-bed Fenton-like oxidation of a textile dye using natural magnetite Degradation of Acid Orange 7 (AO7) as a model azo dye was investigated in a recirculating pilot fluidized-bed reactor by a Fenton-like process using natural magnetite (NM) and potassium persulfate (K2S2O8). Scanning electron microscopy was performed to characterize the magnetite sample. The heterogeneous Fenton-like process (NM/ $${\text{S}}_{2} {\text{O}}_{8}^{2 - }$$ S 2 O 8 2 - ) is a modified method owing to its enhanced mass transfer. It can be operated reliably and simply by reducing the produced iron oxide sludge in the conventional Fenton process. Degradation efficiency (DE %) of AO7 by NM/ $${\text{S}}_{2} {\text{O}}_{8}^{2 - }$$ S 2 O 8 2 - process was affected by operational parameters. The DE % of 75 % was obtained for the AO7 treatment (15 mg/L) at the desired conditions, such as pH 5, 0.2 mM $${\text{S}}_{2} {\text{O}}_{8}^{2 - }$$ S 2 O 8 2 - , and 0.5 g/L NM after 120 min of reaction time. The dye degradation rate in all the experiments followed the pseudo-second-order kinetic with high correlation coefficients (R 2 ≥ 0.98). The low released iron concentration, successive reusability at milder pH and the recirculation mode with the proper mixing are the significant advantages of the NM/ $${\text{S}}_{2} {\text{O}}_{8}^{2 - }$$ S 2 O 8 2 - process. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Fluidized-bed Fenton-like oxidation of a textile dye using natural magnetite

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Publisher
Springer Netherlands
Copyright
Copyright © 2016 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-016-2580-1
Publisher site
See Article on Publisher Site

Abstract

Degradation of Acid Orange 7 (AO7) as a model azo dye was investigated in a recirculating pilot fluidized-bed reactor by a Fenton-like process using natural magnetite (NM) and potassium persulfate (K2S2O8). Scanning electron microscopy was performed to characterize the magnetite sample. The heterogeneous Fenton-like process (NM/ $${\text{S}}_{2} {\text{O}}_{8}^{2 - }$$ S 2 O 8 2 - ) is a modified method owing to its enhanced mass transfer. It can be operated reliably and simply by reducing the produced iron oxide sludge in the conventional Fenton process. Degradation efficiency (DE %) of AO7 by NM/ $${\text{S}}_{2} {\text{O}}_{8}^{2 - }$$ S 2 O 8 2 - process was affected by operational parameters. The DE % of 75 % was obtained for the AO7 treatment (15 mg/L) at the desired conditions, such as pH 5, 0.2 mM $${\text{S}}_{2} {\text{O}}_{8}^{2 - }$$ S 2 O 8 2 - , and 0.5 g/L NM after 120 min of reaction time. The dye degradation rate in all the experiments followed the pseudo-second-order kinetic with high correlation coefficients (R 2 ≥ 0.98). The low released iron concentration, successive reusability at milder pH and the recirculation mode with the proper mixing are the significant advantages of the NM/ $${\text{S}}_{2} {\text{O}}_{8}^{2 - }$$ S 2 O 8 2 - process.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: May 26, 2016

References

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