کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
726672 1461423 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Visible light photocatalytic performance of hierarchical BiOBr microspheres synthesized via a reactable ionic liquid
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی برق و الکترونیک
پیش نمایش صفحه اول مقاله
Visible light photocatalytic performance of hierarchical BiOBr microspheres synthesized via a reactable ionic liquid
چکیده انگلیسی

Hierarchical BiOBr microspheres were synthesized via a one-pot solvothermal process in the presence of ethylene glycol and 1-butyl-3-methylimidazolium bromide ([BMIM]Br) as a reactable ionic liquid. The products were characterized by X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance absorption spectra, nitrogen adsorption–desorption measurements, and photoluminescence spectroscopy. The photocatalytic activity of BiOBr microspheres was evaluated in terms of the degradation of Rhodamine B (RhB), methyl orange (MO), and 4-chlorophenol (4-CP) under visible light irradiation. We found that the solvothermal temperature had important effects on the crystallinity, crystallite size, optical property, adsorptive performance, and photocatalytic activity of BiOBr microspheres. BiOBr microspheres with a specific surface area of 15.7 m2 g−1 prepared at 160 °C exhibited the best adsorption and photocatalytic performance for RhB degradation in aqueous solution. However, this sample showed hardly any activity for photodegradation of 4-CP. Tests using radical scavengers confirmed that h+ and O2− were the main reactive species during RhB degradation. A possible mechanism for photocatalysis by BiOBr microspheres is proposed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science in Semiconductor Processing - Volume 23, July 2014, Pages 151–158
نویسندگان
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