کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6493098 44025 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Enhancement of the photodegradation of N-nitrosodimethylamine in water using amorphous and platinum manganese oxide catalysts
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
Enhancement of the photodegradation of N-nitrosodimethylamine in water using amorphous and platinum manganese oxide catalysts
چکیده انگلیسی
The enhancement of the photodegradation of toxic N-nitrosodimethylamine (NDMA) in water using amorphous manganese oxide (AMO) and platinum manganese oxide (Pt/Mn3O4) catalysts was investigated. Characterization of the catalysts was carried out using XRD, FESEM, TEM, EDXS, BET, XPS, and AOS. Pt/Mn3O4 and its precursor AMO, synthesized by a redox reaction of Mn2+ and Mn7+, showed similar morphologies. High surface area AMO was confirmed to be amorphous, whereas Pt/Mn3O4 was a mixture of two crystalline structures. The optimum catalyst loading was 25 mg per 100 mL NDMA solution for which the photocatalytic activity was maximized. The average hydrodynamic particle size of a given amount of catalyst increased due to aggregation as a result of an increase in temperature during UV illumination (λ = 254 nm). Photocatalytic studies showed that NDMA degraded according to zero-order kinetics under air saturation at pH 7.0. AMO and Pt/Mn3O4 showed photostability and comparable activities with pure TiO2 and platinized TiO2. Mixed valencies of Mn and the presence of O2 on the surface of the catalysts, which reacts with photogenerated electrons to form reactive oxygen species (hydroxyl and superoxide anion radicals), played significant roles in the enhancement of the photodegradation of NDMA in water.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 217, Issues 2–3, 25 January 2011, Pages 284-292
نویسندگان
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