NDLI: Efficient visible light photocatalytic activity and enhanced stability of BiOBr/Cd(OH)<sub>2</sub> heterostructures

Content Provider	Royal Society of Chemistry (RSC)
Author	Mehraj, Owais Sabir, Suhail Khan, Mohammad Zain Mir, Niyaz A. Pirzada, Bilal Masood
Copyright Year	2015
Abstract	Novel BiOBr/Cd(OH)2 heterostructures were synthesized by a facile chemical bath method under ambient conditions. A series of BiOBr/Cd(OH)2 heterostructures were obtained by tuning the Bi/Cd molar ratios. The obtained heterostructures were characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). Optical properties were studied by UV-visible spectroscopy, diffuse reflectance spectroscopy and photoluminescence (PL). Photocatalytic studies on rhodamine B (RhB) under visible light irradiation showed that the heterostructures are very efficient photocatalysts in mild basic medium. Scavenger test studies confirmed that the photogenerated holes and superoxide radicals (O2˙−) are the main active species responsible for RhB degradation. Comparison of photoluminescence (PL) intensity suggested that an inhibited charge recombination is crucial for the degradation process over these photocatalysts. Moreover, relative positioning of the valence and conduction band edges of the semiconductors, O2/O2˙− and ˙OH/H2O redox potentials and HOMO–LUMO levels of RhB appear to be responsible for the hole-specificity of degradation. Photocatalytic recycling experiments indicated the high stability of the catalysts in the reaction medium without any significant loss of activity. This study hence concludes that the heterojunction constructed between Cd(OH)2 and BiOBr interfaces play a crucial role in influencing the charge carrier dynamics and subsequent photocatalytic activity.
Starting Page	7153
Ending Page	7163
Page Count	11
File Format	HTM / HTML PDF
ISSN	11440546
Volume Number	39
Issue Number	9
Journal	New Journal of Chemistry
DOI	10.1039/c5nj00839e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Water Spectroscopy Rhodamine Oxygen Charge carrier Photoluminescence Carrier generation and recombination HOMO Redox Superoxide Concentration Scanning electron microscope X-ray crystallography Transmission electron microscopy Ultraviolet\u2013visible spectroscopy Valence and conduction bands Heterojunction
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Catalysis

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