access icon free Synthesis of flower-like WO3/Bi2WO6 heterojunction and enhanced photocatalytic degradation for Rhodamine B

Flower-like Bi2WO6 microspheres were prepared by a facile hydrothermal process without any surfactant or template. The WO3/Bi2WO6 samples were prepared by a simple heat treatment. The obtained samples were characterised by X-ray diffraction, field emission scanning electron microscopy, photoluminescence spectra, transient photocurrent and UV–vis absorption spectroscopy. In the heterojunctions, WO3 nanoparticles adhered to the surface of the three-dimensional flower-like hierarchical Bi2WO6. The WO3/Bi2WO6 samples showed much higher photocatalytic activity than pure Bi2WO6 did for Rhodamine B degradation under visible light irradiation. The improved photocatalytic activity is ascribed to the synergic effect between WO3 and Bi2WO6 in the framework, which led to the high transfer rate of photoinduced charge carriers. The possible photocatalytic mechanism of the composites is proposed to further understand the improvement in photocatalytic activity.

Inspec keywords: crystal growth from solution; catalysis; field emission electron microscopy; composite materials; scanning electron microscopy; tungsten compounds; radiation effects; photochemistry; absorption coefficients; microfabrication; photoluminescence; nanoparticles; bismuth compounds; ultraviolet photoelectron spectra; heat treatment

Other keywords: nanoparticles; flower-like Bi2WO6 microspheres; flower-like WO3-Bi2WO6 heterojunction synthesis; photoinduced charge carriers; X-ray diffraction; synergic effect; Rhodamine B degradation; field emission scanning electron microscopy; heat treatment; Bi2WO6-WO3; three-dimensional flower-like hierarchical materials; UV-vis absorption spectroscopy; high transfer rate; facile hydrothermal processing; photoluminescence spectra; enhanced photocatalytic degradation; transient photocurrent spectroscopy; visible light irradiation; composites

Subjects: Photoluminescence in other inorganic materials; Heterogeneous catalysis at surfaces and other surface reactions; Other heat and thermomechanical treatments; Optical constants and parameters (condensed matter); Crystal growth from solution; Structure of solid clusters, nanoparticles, nanotubes and nanostructured materials; Ultraviolet, visible and infrared radiation effects; Photolysis and photodissociation by IR, UV and visible radiation; Photoelectron spectra of composite surfaces

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http://iet.metastore.ingenta.com/content/journals/10.1049/mnl.2015.0147
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