access icon free Photocatalytic reduction and oxidation activities of nanosheet-assembled anatase TiO2 microspheres

Nanosheet-assembled anatase titanium dioxide (TiO2) microspheres (ST) have been successfully synthesised using the hydrothermal method. The physical and chemical properties of ST were well characterised by X-ray diffraction, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, photoluminescence and Brunauer-Emmett-Teller (BET) analysis. The photocatalytic reduction and oxidation activities of the as-prepared sample were evaluated by removing heavy metal Cr (VI) and by degradation of organic dyes (methyl orange (MO) and rhodamine B (Rh B)), respectively. P25 and commercial pure anatase TiO2 were used for comparison. The nanosheet-assembled anatase TiO2 microspheres displayed better photocatalytic efficiency towards the photo-reductive conversion of Cr (VI). Moreover, it also exhibited higher photocatalytic activity for the degradation of organic dyes compared with that of P25 and commercial pure anatase TiO2.

Inspec keywords: reduction (chemical); semiconductor materials; scanning electron microscopy; nanofabrication; transmission electron microscopy; field emission electron microscopy; nanostructured materials; oxidation; photodissociation; catalysis; liquid phase deposition; titanium compounds; photoluminescence; semiconductor growth; X-ray diffraction; X-ray photoelectron spectra; dyes

Other keywords: oxidation; chemical properties; photoluminescence; photocatalytic activity; field emission scanning electron microscopy; transmission electron microscopy; nanosheet-assembled anatase titanium dioxide microspheres; Brunauer-Emmett-Teller method; methyl orange; photocatalytic reduction; organic dye degradation; MO; heavy metal; hydrothermal method; X-ray photoelectron spectroscopy; physical properties; Rh B; TiO2; X-ray diffraction; rhodamine B

Subjects: Specific chemical reactions; reaction mechanisms; Low-dimensional structures: growth, structure and nonelectronic properties; Photoluminescence in other inorganic materials; Nanometre-scale semiconductor fabrication technology; Heterogeneous catalysis at surfaces and other surface reactions; Deposition from liquid phases (melts and solutions); Oxide and ferrite semiconductors; Electron spectroscopy for chemical analysis (photoelectron, Auger spectroscopy, etc.); Deposition from liquid phases; Photochemistry and radiation chemistry; Nanofabrication using thin film deposition methods

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http://iet.metastore.ingenta.com/content/journals/10.1049/mnl.2015.0119
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