Journal
QUIMICA NOVA
Volume 35, Issue 3, Pages 559-562Publisher
SOC BRASILEIRA QUIMICA
DOI: 10.1590/S0100-40422012000300022
Keywords
diclofenac; beta-cyclodextrins; photodegradation
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Funding
- Shanghai Municipal Education Commission [J51803]
- National Natural Science Foundations of China [50974087]
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Diclofenac is one of most frequently detected compounds in the water cycle. In this work, the effect of initial concentration, liquid inclusion complexes with beta-Cyclodextrins (beta-CDs) on the photodegradation of diclofenac were studied. Six phototransformation products were detected by HPLC chromatograms. UV-absorption spectra of diclofenac and phototransformation products were determined. One of the phototransformation products was identified. The degradation followed pseudo-first-order kinetics. The experiment showed that irradiation of diclofenac in the presence of beta-CDs increase photodegradation rate and determined the optimal molar ratio of diclofenac to beta-CDs as 1:2. The reduced photohaemolytic activity of diclofenac in the presence of beta-CDs may be attributed to the sequestering and stabilizing of the radical intermediates and /or photoproducts by complexation.
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