Enhanced sonolytic mineralization of basic red 29 in water by integrated ultrasound/Fe2+/TiO2 treatment

Enhanced sonolytic mineralization of basic red 29 in water by integrated ultrasound/Fe2+/TiO2... Advanced oxidation processes (AOPs), based on hydroxyl radical (·OH) induced oxidation, have been widely investigated to develop novel and green technologies for wastewater treatment. In this work, the degradation and mineralization of Basic Red 29 (BR29), a cationic azo dye, by ultrasound (US) at 300 kHz and 80 W was investigated. Even if ultrasound eliminated BR29 (30 mg L−1) in 1 h, a low degree of mineralization (~10 %) was obtained due to the hydrophilic character of the byproducts formed during the sono-oxidative process. To overcome this weakness, an innovative technique integrating ultrasound/Fe2+/TiO2 was used and was found to be more effective for the degradation and mineralization of the dye. The amount of each catalyst was optimized for the three systems US/TiO2, US/Fe2+ and US/Fe2+/TiO2. The degradation rate of BR29 with US/Fe2+ and US/Fe2+/TiO2 treatments was, respectively, 2 and 2.34 times higher than that obtained with US alone. Correspondingly, the mineralization degree increased from 5 % with ultrasound alone to 10 % with US/TiO2, 35 % with US/Fe2+ and 64 % with US/Fe2+/TiO2 after 30 min of treatment and from 10 % with US to 13, 51, and 81 % with, respectively, US/TiO2, US/Fe2+, and US/Fe2+/TiO2 processes after 1 h of treatment. These results showed a synergy of 1.41 at 30 min and 1.29 at 1 h between US/Fe2+ and US/TiO2 processes toward the mineralization of BR29. The mechanism of the beneficial effect of the US/Fe2+/TiO2 integrating treatment was clarified and discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Enhanced sonolytic mineralization of basic red 29 in water by integrated ultrasound/Fe2+/TiO2 treatment

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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/s11164-016-2724-3
Publisher site
See Article on Publisher Site

Abstract

Advanced oxidation processes (AOPs), based on hydroxyl radical (·OH) induced oxidation, have been widely investigated to develop novel and green technologies for wastewater treatment. In this work, the degradation and mineralization of Basic Red 29 (BR29), a cationic azo dye, by ultrasound (US) at 300 kHz and 80 W was investigated. Even if ultrasound eliminated BR29 (30 mg L−1) in 1 h, a low degree of mineralization (~10 %) was obtained due to the hydrophilic character of the byproducts formed during the sono-oxidative process. To overcome this weakness, an innovative technique integrating ultrasound/Fe2+/TiO2 was used and was found to be more effective for the degradation and mineralization of the dye. The amount of each catalyst was optimized for the three systems US/TiO2, US/Fe2+ and US/Fe2+/TiO2. The degradation rate of BR29 with US/Fe2+ and US/Fe2+/TiO2 treatments was, respectively, 2 and 2.34 times higher than that obtained with US alone. Correspondingly, the mineralization degree increased from 5 % with ultrasound alone to 10 % with US/TiO2, 35 % with US/Fe2+ and 64 % with US/Fe2+/TiO2 after 30 min of treatment and from 10 % with US to 13, 51, and 81 % with, respectively, US/TiO2, US/Fe2+, and US/Fe2+/TiO2 processes after 1 h of treatment. These results showed a synergy of 1.41 at 30 min and 1.29 at 1 h between US/Fe2+ and US/TiO2 processes toward the mineralization of BR29. The mechanism of the beneficial effect of the US/Fe2+/TiO2 integrating treatment was clarified and discussed.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Sep 14, 2016

References

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