کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
606971 1454551 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Highly active magnetic bismuth tungstate/magnetite composite under visible light irradiation in the presence of hydrogen peroxide
ترجمه فارسی عنوان
کامپوزیت تنگستات / مگنتیت بیسموت مغناطیسی بسیار فعال تحت تابش نور مرئی در حضور پراکسید هیدروژن
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
چکیده انگلیسی

Bi2WO6/Fe3O4 composites were synthesized using hydrothermal method and their photocatalytic activity to degrade rhodamine B (RhB) under visible light irradiation assisted with H2O2 and underlying mechanisms were investigated. The composites were 3D flower-like microspheres constructed by 2D Bi2WO6 nanosheets loaded with spherical Fe3O4 nanoparticles. The composited photocatalysts could be easily harvested from the reaction solution by an external magnetic field. In the presence of H2O2, a large amount of hydroxyl radicals (OHs) were produced by H2O2 reacting with photogenerated electrons. Fe3O4 not only promoted the separation of hole–electron pairs but also acted as a Fenton-like reagent, expediting the production of OH. Thus, the composites in the presence of H2O2 displayed much higher photocatalytic efficiency to degrade RhB than pure Bi2WO6. 98% of RhB (initial concentration 10 mg/L) was degraded in 2 h visible irradiation and 60% of total organic carbon (TOC) was removed in 3 h by 0.5 g/L Bi2WO6/Fe3O4 (5:1). The composite displayed high photodegradation efficiency at pH 3–9. Our study suggests that a visible light driven and highly active magnetic photocatalyst-Fenton coupling oxidation system may have potential application in water treatment and environmental cleaning.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 444, 15 April 2015, Pages 123–131
نویسندگان
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