Journal article
Effects of chloride ions on bleaching of azo dyes by Co2+/Oxone regent: kinetic analysis
Journal of Hazardous Materials, Vol.190(1-3), pp.1083-1087
2011
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Abstract
<p>Orange II (Org II), one of the most common used azo dyes, was taken as a model to investigate the effects of chloride ion on dye decoloration in cobalt/peroxymonosulfate (Co/PMS) system. A significant decrease in the rate of Org II decoloration was observed upon addition of Cl<sup>−</sup> (0.05–10 mM), but further addition of Cl<sup>−</sup> (>50 mM) apparently accelerated dyes degradation. This dual effect of chloride on dyes bleaching was also observed as other halide ions (e.g. Br<sup>−</sup>, I<sup>−</sup>) or other azo dyes were present in Co/PMS system. In the Co-free PMS solutions, the observed first-order rate constant always exponentially increased with the chloride content. The reactive chlorine species generated from chloride oxidation by PMS should be responsible for this non-radical mechanism for dye decoloration, however, these rapid decoloration of Org II as chloride ion was present, did not readily lead to much mineralization. Therefore, this finding may have significant technical implications for utilizing Co/PMS regent to detoxify chloride-rich azo dyes wastewater.</p>
Details
- Title
- Effects of chloride ions on bleaching of azo dyes by Co2+/Oxone regent: kinetic analysis
- Creators
- Zhaohui Wang - Donghua UniversityRuxia Yuan - Donghua UniversityYaoguang Guo - Donghua UniversityLei Xu - Donghua UniversityJinashe Liu - Donghua University
- Publication Details
- Journal of Hazardous Materials, Vol.190(1-3), pp.1083-1087
- Identifiers
- 1199; 991012820752702368
- Academic Unit
- Southern Cross GeoScience
- Resource Type
- Journal article