کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4482546 1316862 2013 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Photodegradation of naproxen and its photoproducts in aqueous solution at 254 nm: A kinetic investigation
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Photodegradation of naproxen and its photoproducts in aqueous solution at 254 nm: A kinetic investigation
چکیده انگلیسی

The kinetics of photodegradation of the non steroidal anti-inflammatory drug naproxen (+)-S-2-(6-methoxynaphthalen-2-yl)propanoic acid, an emerging organic pollutant, was studied in aqueous solutions under deaerated and aerated conditions. The photolysis experiments were carried out under monochromatic irradiation (λ = 254 nm) at pH = 7.0 and T = 25 °C.Simplified reaction schemes of photodegradation of naproxen are proposed in absence and in presence of oxygen respectively. The schemes take into account the photolysis of naproxen and its photoproducts and the reactions of the measured species with oxygen dissolved in the liquid bulk. According to these schemes, two kinetic models were developed which correlate the experimental data, for runs performed in absence and in presence of oxygen, with a fair accuracy and allowed to estimate the best values for the unknown kinetic parameters.The calculated quantum yield of direct photolysis of naproxen under deaerated media is in good agreement with the one previously reported. Under aerated conditions, the generation of singlet oxygen has also been taken into account.The obtained results, under the adopted conditions, indicated a marked influence of dissolved oxygen on the photodegradation rates of naproxen and the relative distribution of the major reaction intermediates.

Figure optionsDownload high-quality image (217 K)Download as PowerPoint slideHighlights
► Photodegradation of naproxen in water under deaerated and aerated media at 254 nm
► Influence of oxygen on the photoreaction rates of naproxen.
► Kinetic modelling of the photooxidation process.
► Estimation of unknown kinetic parameters for the first time.
► The kinetic model has a good agreement with the experimental data.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 47, Issue 1, 1 January 2013, Pages 373–383
نویسندگان
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