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High Photocatalytic Activity under Visible Light for a New Morphology of Bi2WO6 Microcrystals

2019; Multidisciplinary Digital Publishing Institute; Volume: 9; Issue: 8 Linguagem: Inglês

10.3390/catal9080667

2073-4344

Willison Eduardo Oliveira Campos, Francisco Xavier Nobre, Geraldo Narciso da Rocha Filho, Marcos A. R. da Silva, Carlos Emmerson Ferreira da Costa, Luís Adriano Santos do Nascimento, José Roberto Zamian,

Luminescence Properties of Advanced Materials

In this work, a new morphology was obtained for bismuth tungstate (Bi2WO6-glyc) using a hydrothermal method with the addition of glycerol as a surfactant. In order to compare, the bismuth tungstate without glycerol as the surfactant, i.e., Bi2WO6, was synthesized. Structural characterization by XRD and Rietveld refinement confirmed the orthorhombic structure as a single phase for all samples with high crystallinity. All active modes in Raman spectroscopy for the orthorhombic phase of bismuth tungstate were confirmed in agreement with XRD analysis. N2 adsorption/desorption and size pore distribution confirmed the high surface area (85.7 m2/g) for Bi2WO6-glyc when compared with Bi2WO6 (8.5 m2/g). The optical band gap by diffuse reflectance was 2.78 eV and 2.88 eV for Bi2WO6-glyc and Bi2WO6, respectively. SEM images confirmed the different morphology for these materials, and microstructures with cheese crisp were observed for Bi2WO6-glyc (cheese crisp). On the other hand, flower-like microcrystals were confirmed for Bi2WO6 sample. The photocatalytic performance of Bi2WO6-glyc (94.2%) in the photodegradation of rhodamine B (RhB) dye solutions at 60 min was more expressive than Bi2WO6 (81.3%) and photolysis (8.2%) at 90 min.