Heterogeneous Activation of Oxone Using Co3O4

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Department of Civil & Environmental Engineering, University of Cincinnati, 765 Baldwin Hall, Cincinnati, Ohio 45221-0071, and Engineering Science Department, University of Patras, 26500 Patras, Greece
Cite this: J. Phys. Chem. B 2005, 109, 27, 13052–13055
Publication Date (Web):June 16, 2005
https://doi.org/10.1021/jp052166y
Copyright © 2005 American Chemical Society
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Abstract

This study explores the potential of heterogeneous activation of Oxone (peroxymonosulfate) in water using cobalt oxides. Two commercially available cobalt oxides, CoO and Co3O4 (CoO·Co2O3) were tested for the activation of peroxymonosulfate and the consequent oxidation of 2,4-dichlorophenol (2,4-DCP) via a sulfate radical mechanism. Both systems, CoO/Oxone and Co3O4/Oxone, were tested at acidic and neutral pH and compared with the homogeneous Co(NO3)2/Oxone. The activity of these systems was evaluated on the basis of the induced transformation of 2,4-DCP as well as the dissolution of cobalt occurred after 2 h of reaction. It was observed that only Co3O4 activates peroxymonosulfate heterogeneously, with its heterogeneity being more pronounced at neutral pH. Both CoO and Co2O3 contained in Co3O4 might be responsible for the observed heterogeneity, and the relative mechanisms are further discussed here. To our knowledge, this is perhaps the first study that documents the heterogeneous activation of peroxymonosulfate with cobalt, the best-known catalyst-activator for this inorganic peroxide.

 University of Cincinnati.

 University of Patras.

*

 Corresponding author. E-mail:  [email protected] Fax:  +1 513 556 2599. Tel:  +1 513 556 0724.

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