Catalytic Decomposition of Potassium Monopersulfate. Influence of Variables

Authors: Javier Rivas, Olga Gimeno, Maria Carbajo, Teresa Borralho

Abstract:

Potassium monopersulfate has been decomposed in aqueous solution in the presence of Co(II). The effect of the main operating variables has been assessed. Minimum variations in pH exert a considerable influence on the process kinetics. Thus, when no pH adjustment is considered, the actual effect of variables like initial monopersulfate and/or catalyst concentration may be hindered. As expected, temperature enhances the monopersulfate decomposition rate by following the Arrhenius law. The activation energy in the proximity of 85 kJ/mol has been obtained. Amongst the different solids tested in the monopersulfate decomposition, only the perovskite LaTi0.15Cu0.85O3 has shown a significant catalytic activity.

Keywords: Monopersulfate, Oxone®, Sulfate radicals, Watertreatment.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1329705

References:

[1] F. J. Rivas, F. J. Beltrán, F. Carvalho, and P. M. Alvarez, "Oxone promoted wet air oxidation of landfill leachates," Ind. Eng. Chem. Res. , 44, pp 749-758, 2005.
[2] J. E. Bennett, B. C. Gilbert, and J. K. Stell, "Mechanisms of peroxide decomposition. EPR studies of the one electron oxidation of the peroxymonosulphate anion and the reactions of SO5 -º," J. Chem. Soc. Perkin Trans., 2, pp 1105, 1991.
[3] G. P. Anipsitakis, and D. D. Dionysiou, "Radical generation by the interaction of transition metals with common oxidants," Environ. Sci. Technol., 38, pp 3705-3712, 2004.
[4] J. Fernandez , P. A. Maruthamuthu, and J. Kiwi, "Photobleaching and mineralization of Orange II by oxone and metal ions involving Fenton like chemistry under visible light," J. Photochem & Photobiol. A,. 161, pp 185, 2004.
[5] URL: www.dupont.com/oxone/
[6] G. P. Anipsitakis, and D. D. Dionysiou, "Radical generation by the interaction of transition metals with common oxidants," Environ. Sci. & Technol., 38, pp 3705-3712, 2004.
[7] F. J. Rivas, R. Garcia de la Calle, J. F. Garcia Araya, and O. Gimeno, "Promoted wet air oxidation of polynuclear aromatic hydrocarbons," J. Hazard. Mater., 41, pp 4672-4685, 2007.
[8] M. Carbajo, F. Beltrán, O. Gimeno, B. Acedo, and F. J. Rivas, "Ozonation of phenolic wastewaters in the presence of a perovskite type catalysts," J. Appl. Catal. Part B, 74, pp 203-210, 2007.
[9] Z. Zhang, and J. O. Edwards, "Chain lengths in the decomposition of peroxomonosulfate catalyzed by cobalt and vanadium. Rate law for catalysis by vanadium," Inorg. Chem., 31, pp 3514-3517, 1992.