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2014 | 59 | 1 | 25-35
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Caffeine degradation in water by gamma irradiation, ozonation and ozonation/gamma irradiation

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Aqueous solutions of caffeine were treated with ozone and gamma irradiation. The amounts of remaining caffeine were determined after solid phase extraction as a function of absorbed dose and ozonation time. In addition to this, some important parameters such as inorganic ions, chemical oxygen demand (COD) dissolved oxygen and total acidity changes were followed. Caffeine (50 ppm) is found to be completely decomposed at 3.0 kGy and 1.2 kGy doses in the absence of H2O2 and in 1.20 mM H2O2 solutions, respectively. In the case of gamma irradiation after ozonation, 50 ppm caffeine was removed at 0.2 kGy when the solution was ozonized for 100 s at a rate of 10 g O3 h-1 in 400 mL 50 ppm paracetamol solution.

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  • Department of Chemistry, Hacettepe University, 06800 Beytepe, Ankara, Turkey, Tel.: +90 312 297 7988, Fax: +90 312 299 2163,
  • Institute of Radiation Problems of Azerbaijan National Academy of Science, 9 B. Vakhabzade Str., Baku, Azerbaijan
  • Department of Chemistry, Hacettepe University, 06800 Beytepe, Ankara, Turkey, Tel.: +90 312 297 7988, Fax: +90 312 299 2163
  • Department of Chemistry, Hacettepe University, 06800 Beytepe, Ankara, Turkey, Tel.: +90 312 297 7988, Fax: +90 312 299 2163
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