Kinetics and Mechanism of Humic Acids Degradation by Ozone in the Presence of CeO2/AC

This work investigated the catalytic ozonation of humic acids extracted from landfill leachate in the presence of CeO2/AC with focus on the kinetics of humic acids degradation. It was confirmed that the degradation of humic acids mainly took place in the solution bulk. The direct and indirect reaction constants of ozone against humic acids were determined. By analyzing the contributions of direct ozone oxidation and indirect •OH radicals oxidation to humic acids removal, it was found that •OH radicals oxidation predominated at all pH, indicating that the catalytic ozonation of humic acids with CeO2/AC involved •OH radicals mechanism.

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