Journal
CHEMOSPHERE
Volume 67, Issue 4, Pages 802-808Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2006.10.032
Keywords
AO7; advanced oxidation technology; sulfate radical; kinetics; peroxymonosulfate
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A kinetic model was proposed and used to interpret the experimental data for degradation of Acid Orange 7 (AO7) in aqueous solution induced by Co2+/peroxymonosulfate (Co/PMS) reagent in terms of both decolorization and mineralization. The pseudo first-order decolorization rate constants are related to [Co2+], [PMS], reciprocal of [H+] and [AO7](0). Activation energy of the AO7 decolorization process was determined to be 75.7 kJ mol(-1). UV and visible light can accelerate the decolorization and mineralization process due to different mechanisms. In the combined UV/Co/PMS system, UV light can decompose PMS to generate hydroxyl ((OH)-O-center dot) and sulfate radicals (SO4 center dot-), while in the Vis/Co/PMS system, excited AO7 molecules can transfer electrons to PMS or Co3+ and thus accelerate the decomposition of PMS and catalytic cycle of Co3+/Co2+. (c) 2006 Elsevier Ltd. All rights reserved.
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