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Lee, Changha
Advanced Redox Technology (ART) Lab
Research Interests
  • Water Treatment, Advanced Oxidation/Reduction, Water Chemistry, Environmental Catalyst

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Degradation of diclofenac and carbamazepine by the copper(II)-catalyzed dark and photo-assisted Fenton-like systems

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Title
Degradation of diclofenac and carbamazepine by the copper(II)-catalyzed dark and photo-assisted Fenton-like systems
Author
Lee, Hye-JinLee, HongshinLee, Changha
Issue Date
2014-06
Publisher
ELSEVIER SCIENCE SA
Citation
CHEMICAL ENGINEERING JOURNAL, v.245, pp.258 - 264
Abstract
The oxidative degradation of two pharmaceutical compounds (diclofenac and carbamazepine, denoted as DCF and CBZ) by the Cu(II)-catalyzed Fenton (Cu(II)/H2O2) and the photo-Fenton (UV/Cu(II)/H2O2) systems was examined, with a focus on the parameters that affected the oxidant production, such as the solution pH, the Cu(II) concentration, and the radical scavengers. The degradation of DCF and CBZ in the Cu(II)/H2O2 and UV/Cu(II)/H2O2 systems followed the pseudo-first-order kinetics, which exhibited increasing rate constants with the increasing concentration of Cu(II). In the Cu(II)/H2O2 system, the optimal degradation of the target contaminants was observed at approximately pH 8, which is attributed to the combined effects of two pH-dependent factors: (1) the accelerated Cu(II) reduction by H2O2 with increasing pH and (2) the shift of the main oxidant from the hydroxyl radical (OH) to the cupryl ion (Cu[III]) at high pH values. The complete prevention of the degradation of DCF and CBZ in the presence of excess tert-butanol indicates that OH is dominantly responsible for the contaminant degradation. The UV-A irradiation significantly enhanced the degradation of the target contaminants over the entire pH range studied (pH 3-10) and slightly shifted the optimal pH conditions to lower values (pH 6-7). The enhanced degradation of the contaminants by the UV/Cu(II)/H2O2 system appears to result from the accelerated Cu(II) reduction by the hydroperoxyl/superoxide radicals (HO2/O2-), which are produced via the photolysis of H2O2.
URI
https://scholarworks.unist.ac.kr/handle/201301/4402
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84897696542
DOI
10.1016/j.cej.2014.02.037
ISSN
1385-8947
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