کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9876336 | 1533548 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Reactivity differences of hydroxyl radicals and hydrated electrons in destructing azo dyes
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
تشعشع
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The high-energy radiation-induced degradation of an H-acid derivative azo dye, Apollofix-Red SF-28 (AR-28) was studied in aqueous solution by using pulse radiolysis with kinetic spectroscopic detection for transient measurements. Gamma radiolysis with UV-VIS spectroscopy and gradient ionpair HPLC separation with diode array detection were applied for following the destruction of AR-28 and measuring the products. The reactions of hydrated electron (eaqâ) and hydroxyl (OH) radical were investigated separately. OH reacts with the unsaturated bonds of the molecule. In the further reactions of the OH adduct radicals, the AR-28 molecules partly reform with a slightly modified structure. The products formed in the first reaction of OH and AR-28 molecules have also high reactivity towards the OH radicals. For these reasons the efficiency of OH radicals in discolouration of the solution is relatively low, it is below 0.5. The efficiency is much higher, close to unity for eaqâ. The reaction of eaqâ with AR-28 leads to an immediate destruction of the colour-giving centre.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Radiation Physics and Chemistry - Volume 74, Issues 3â4, OctoberâNovember 2005, Pages 239-246
Journal: Radiation Physics and Chemistry - Volume 74, Issues 3â4, OctoberâNovember 2005, Pages 239-246
نویسندگان
L. Wojnárovits, T. Pálfi, E. Takács, S.S. Emmi,