Kinetics and degradation mechanism of clofibric acid and diclofenac in UV photolysis and UV/H2O2reaction

In Young Kim, Moon Kyung Kim, Yeomin Yoon, Jong Kwon Im, Kyung Duk Zoh

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29 Scopus citations


In this study, we investigated the removal of the selected pharmaceuticals, clofibric acid and diclofenac, using UV photolysis and UV/H2O2reactions. The degradation of diclofenac during UV photolysis reaction was faster than that of clofibric acid. Diclofenac was mainly removed by photolysis reaction; clofibric acid was more sensitive to OH radical. More effective removals of clofibric acid and diclofenac were observed when H2O2was added in the UV photolysis reaction. The competition kinetics showed that the second-order rate constant between the OH radical and the pharmaceuticals was 5.57 × 109M−1s−1for clofibric acid and 2.45 × 109M−1s−1for diclofenac, respectively. The major reaction intermediates during the UV photolysis and UV/H2O2reactions of clofibric acid were 4-chlorophenol and hydroquinone, and these intermediates were degraded as phenol with further reaction.

Original languageEnglish
Pages (from-to)6211-6218
Number of pages8
JournalDesalination and Water Treatment
Issue number31-33
StatePublished - Sep 2014

Bibliographical note

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© 2013 Balaban Desalination Publications. All rights reserved.


  • Competition kinetics
  • Hydroquinone
  • Mineralization
  • OH radical
  • Phenol


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