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J Hazard Mater. 2010 Jun 15;178(1-3):385-9. doi: 10.1016/j.jhazmat.2010.01.091. Epub 2010 Jan 25.

Oxidative degradation of dyes in water using Co2+/H2O2 and Co2+/peroxymonosulfate.

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  • 1Department of Chemical Engineering, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia.

Abstract

Dye degradation using advanced oxidation processes with Co(2+)/H(2)O(2) and Co(2+)/peroxymonosulfate (PMS) systems has been investigated. Two types of dyes, basic blue 9 and acid red 183, were employed. Several parameters affecting dye degradation such as Co(2+), PMS, H(2)O(2), and dye concentrations were investigated. The optimal ratio of oxidant (PMS, H(2)O(2))/Co(2+) for the degradation of two dyes was determined. It is found that dye decomposition is much faster in Co(2+)/PMS system than in Co(2+)/H(2)O(2). For Co(2+)/H(2)O(2), an optimal ratio of H(2)O(2) to Co(2+) at 6 is required for the maximum decomposition of the dyes. For Co(2+)/PMS, higher concentrations of Co(2+) and PMS will increase dye degradation rate with an optimal ratio of 3, achieving 95% decolourisation. For basic blue 9, a complete decolourisation can be achieved in 5 min at 0.13 mM Co(2+), 0.40 mM PMS and 7 mg/l basic blue 9 while the complete degradation of acid red 183 will be achieved at 30 min at 0.13 mM Co(2+), 0.40 mM PMS and 160 mg/l of acid red 183. The degradation of acid red 183 follows the second-order kinetics.

Copyright 2010 Elsevier B.V. All rights reserved.

PMID:
20144502
[PubMed - indexed for MEDLINE]
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