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Ozone: Science & Engineering
The Journal of the International Ozone Association
Volume 37, 2015 - Issue 4
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Original Articles

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

Hangdao QinChengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu610041, China;University of the Chinese Academy of Sciences, Beijing100049, ChinaCorrespondence[email protected]
,
Qingzhi DongChengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu610041, China;University of the Chinese Academy of Sciences, Beijing100049, China
,
Honglin ChenChengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu610041, China
,
Guo YangChengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu610041, China;University of the Chinese Academy of Sciences, Beijing100049, China
&
Xiaoming ZhangChengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu610041, China
Pages 371-378 | Published online: 17 Jun 2015
 
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Abstract

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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