WO3/TiO2 heterostructures tailored by the oriented attachment mechanism: insights from their photocatalytic properties

Autor(es)

de Castro, Isabela Alves ^[1] ; Avansi, Jr., Waldir ^{[2, 3]} ; Ribeiro, Caue ^[3]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos UFSCar, Dept Quim, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos UFSCar, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil

^[3] Embrapa CNPDIA, BR-13560970 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CrystEngComm; v. 16, n. 8, p. 1514-1524, 2014.
• Citações Web of Science: 34

Resumo

Efficient WO3/TiO2 photocatalysts were obtained through the Oriented attachment mechanism via hydrothermal annealing, which entailed using previously prepared WO3 particles and commercial TiO2 nanoparticles as ``building blocks{''}. The photoreactivity of this material towards organic contaminant degradation was enhanced compared to commercial TiO2 because the coupling of the WO3/TiO2 structures reduced the recombination of the photogenerated charges in anatase TiO2. The pristine WO3 nanoparticles were prepared by hydrothermally assisted degradation of a W-peroxocomplex and all of the prepared materials were characterized by X-ray diffraction, Raman spectroscopy, thermogravimetric analysis, electron microscopy, Near-Infrared spectroscopy, nitrogen physical adsorption (BET method), photoluminescence spectroscopy (PL) and diffuse reflectance spectra (DRS). The optimal compositional ratio for the WO3/TiO2 heterostructures was 30-40 wt% of WO3. We also provided the interface formation in the HRTEM images by observing the presence of the lattice spacing of the (101) and (120) planes of TiO2 anatase and WO3 orthorhombic crystals, respectively, which allows the charge migration during the photocatalyzed degradation of the heterostructures, thereby improving their photoactivity. (AU)

• Processo FAPESP: 11/21566-7 - Heteroestruturas baseadas em nanocristais semicondutores: síntese e avaliação do potencial na fotocatálise da degradação de contaminantes orgânicos em águas
• Beneficiário: Cauê Ribeiro de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 11/07484-8 - Síntese de Heteroestruturas TiO2 / WO3 pelo método dos peróxidos oxidantes e avaliação de seu potencial como fotocatalisadores da degradação de contaminantes orgânicos.
• Beneficiário: Isabela Alves de Castro
• Modalidade de apoio: Bolsas no Brasil - Doutorado