کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
157816 456983 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Photocatalytic activities of AgBr/Y-zeolite in water under visible light irradiation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Photocatalytic activities of AgBr/Y-zeolite in water under visible light irradiation
چکیده انگلیسی

A novel photocatalytic material was synthesized by dispersion of AgBr (silverbromide) in Y-zeolite. The catalysts were characterized using XRD (X-ray diffraction), UV–Vis spectrophotometry and ICP-AES analysis. The photocatalytic activity and stability of the synthesized catalysts were evaluated for methyl orange (MO) degradation in aqueous solution in the presence of halogen light or direct sunlight. Three parameters were examined, namely AgBr content in catalysts ([wt%]AgBr[wt%]AgBr), incident light intensity (I0)(I0) and catalyst loading (Wcat)(Wcat) in reaction suspension. MO degradation was found to follow the zero-order kinetics, and the reaction rate (-dCt/dt)(-dCt/dt) could be expressed as -dCt/dt=5.6×10-10[wt%]AgBr·I0·Wcat0.42 in this study. XRD analysis and the cycling runs indicated that AgBr could remain stable and effective after long time irradiation. The results from MO degradation in the presence of methanol or hydrogen peroxide and potassium iodide oxidation demonstrated that AgBr/Y-zeolite catalysts prepared in this study could initiate the photoreduction process.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Science - Volume 64, Issue 12, 15 June 2009, Pages 2881–2886
نویسندگان
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