New Insights Into BiVO4 Properties as Visible Light Photocatalyst

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• 作者：Tamar Saison ; Nicolas Chemin ; Corinne Chan茅ac ; Olivier Durupthy ; Laurence Mariey ; Fran莽oise Maug茅 ; Vlasta Brezov谩 ; Jean-Pierre Jolivet
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：June 11, 2015
• 年：2015
• 卷：119
• 期：23
• 页码：12967-12977
• 全文大小：500K
• ISSN：1932-7455

文摘

Bismuth vanadate has attractive photocatalytic properties under visible light. The influence of structure and morphology of BiVO₄ nanomaterials on its photocatalytic properties in the UV and the visible domain was investigated. The selection of different sets of synthetic parameters in aqueous solution鈥攑H or the use of organic additives鈥攁llowed the formation of tetragonal zircon, tetragonal scheelite, and monoclinic scheelite structure and different morphologies of that last phase. First, the tetragonal zircon was found to be the only inactive structure. Then, the best material for photocatalytic degradation of rhodamine B in solution and stearic acid deposited directly on the photocatalyst is the core鈥搒hell tetragonal zircon鈥搈onoclinic scheelite system prepared in the presence of sodium dodecyl sulfate. The enhanced properties are explained by the presence of strong surface acidic sites corresponding to the presence of surface sulfate residues rather than to the specific morphology of the material. Additionally, an EPR study on the ability of BiVO₄ to generate active surface radical showed that hydroxyl radicals are not generated and that superoxide ion concentration under irradiation is close to the detection threshold. Depending on the selected irradiation wavelength, bismuth vanadate may present a better photocatalytic activity than titanium oxide. It is shown to be equivalent to bismuth tungstate under blue light.