New Insights Into BiVO4 Properties as Visible Light Photocatalyst - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Physical Chemistry C Année : 2015

New Insights Into BiVO4 Properties as Visible Light Photocatalyst

Résumé

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 solutionpH or the use of organic additivesallowed 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 coreshell tetragonal zircon-monoclinic 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.

Domaines

Matériaux
Fichier non déposé

Dates et versions

hal-01291233 , version 1 (21-03-2016)

Identifiants

Citer

Tamar Saison, Nicolas Chemin, Corinne Chanéac, Olivier Durupthy, Laurence Mariey, et al.. New Insights Into BiVO4 Properties as Visible Light Photocatalyst. Journal of Physical Chemistry C, 2015, 119 (23), pp.12967-12977. ⟨10.1021/acs.jpcc.5b01468⟩. ⟨hal-01291233⟩
151 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More