Oxidation of Dyes by Alkaline-Activated Peroxymonosulfate
Publication: Journal of Environmental Engineering
Volume 142, Issue 4
Abstract
The oxidation of dyes by alkaline-activated peroxymonosulfate (PMS) was investigated for the first time and the dominant oxidizing species in the process were identified. Various dyes [methylene blue (MB), orange G, and direct blue 53] were almost completely removed () by PMS under slightly alkaline conditions (), although there were little or low oxidation efficiencies of dyes by PMS only. Sulfate radicals were proved to be the dominant oxidizing species responsible for rapid and effective dye removal in the alkaline-activated PMS system according to radical scavenger experiments. The dye degradation processes followed a pseudo-first-order kinetic model with high correlation coefficients (). The oxidation rate constants of MB under slightly alkaline conditions increased by approximately 10 times compared with that under acidic or neutral conditions. Increasing the oxidant concentration enhanced the generation of radicals and increased MB removal efficiencies. The mineralization and degradation of MB were further proved by monitoring ultraviolet-visible absorbance spectra and total organic carbon contents of the reaction solution. This alkaline-activated PMS oxidation system would be a good candidate technique for the remediation of wastewater since it leads to less energy consumption and secondary pollution of catalysts compared to other PMS activation methods.
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Acknowledgments
The authors acknowledge the financial supports from National Natural Science Foundation of China (No. 21307005), National Specific Project of Water Pollution Control and Disposal in China (No. 2014ZX07201-010) and International Science & Technology Cooperation Program of China (No. 2013DFR90290).
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Published In
Journal of Environmental Engineering
Volume 142 • Issue 4 • April 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Sep 4, 2014
Accepted: Oct 29, 2015
Published online: Jan 7, 2016
Published in print: Apr 1, 2016
Discussion open until: Jun 7, 2016
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