کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
47376 46470 2010 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Solar photoactivity of nano-N-TiO2 from tertiary amine: role of defects and paramagnetic species
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Solar photoactivity of nano-N-TiO2 from tertiary amine: role of defects and paramagnetic species
چکیده انگلیسی

N-doped TiO2 nanocrystals were successfully synthesized by a controlled sol–gel reaction at pH 9 followed by calcinations at 400 °C. Triethylamine was used to modulate the N content of the samples. The photocatalytic activity was tested using a solar irradiation source with regard to two different pollutants: NOx (in the gas phase) and methylene blue (MB), deposited onto the oxide film. In the case of MB degradation the disappearance of the (MB) blue colour was measured directly onto the solid, by means of UV–vis-NIR diffuse reflectance spectroscopy. The final mineralization of the organic molecule was assessed by COD determinations. All N-doped samples produce a better removal of both pollutants than the undoped and commercial samples. By coupling structural (by X-ray synchrotron radiation) and morphological (HRTEM, BET, granulometry) characterizations with spectroscopic analyses (EPR and XPS), the presence of paramagnetic centers, defects, edge dislocations and surface states is appreciated and found to affect the material photocatalytic behaviour.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis B: Environmental - Volume 96, Issues 3–4, 7 June 2010, Pages 314–322
نویسندگان
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