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Sunlight induced formation of surface Bi2O4−x–Bi2O3 nanocomposite during the photocatalytic mineralization of 2-chloro and 2-nitrophenol

Paper ID Volume ID Publish Year Pages File Format Full-Text
44897 46375 2015 8 PDF Available
Title
Sunlight induced formation of surface Bi2O4−x–Bi2O3 nanocomposite during the photocatalytic mineralization of 2-chloro and 2-nitrophenol
Abstract

•Alpha-Bi2O3 is active for photocatalytic mineralization of 2-chlorophenol and 2-nitrophenol.•The UV portion of sunlight induce Bi2O4−x–Bi2O3 nanocomposite formation.•Bi2O4−x–Bi2O3 nanocomposite has improved photocatalytic performances.

The photocatalytic mineralization of 2-chlorophenol (2-CP) and 2-nitrophenol (2-NP) was investigated using α-Bi2O3. The experiments were performed both in complete spectrum and in the visible region (420–800 nm) of the sunlight. The materials were fully characterized by means of UV–vis diffuse reflectance spectroscopy (DRS), photoluminescence (PL), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analysis and field emission scanning electron microscopy (FESEM). α-Bi2O3 showed considerably higher activity for the mineralization of 2-nitrophenol and 2-chlorophenol under natural sunlight exposure, however still appreciable activity was observed in the visible region. Formation of surface nanocomposites Bi2O4−x–Bi2O3 was observed under sunlight irradiation due to the presence of UV light. The sunlight exposed Bi2O3, i.e. Bi2O4−x–Bi2O3 composite, showed excellent activity for the degradation and mineralization of 2-CP and 2-NP in the visible region of sunlight. A key role of both hydroxyl and superoxide anion radicals was evidenced in the degradation and mineralization processes under sunlight while only hydroxyl radicals were identified as major facilitators under visible light irradiation.

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Keywords
Sunlight photocatalysis; 2-Nitrophenol degradation; 2-Chlorophenol degradation; Bi2O3 based photocatalyst
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Sunlight induced formation of surface Bi2O4−x–Bi2O3 nanocomposite during the photocatalytic mineralization of 2-chloro and 2-nitrophenol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 163, February 2015, Pages 444–451
Authors
, , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us