Synthesis and characterization of ZrO2@SiO2 core-shell nanostructure as nanocatalyst: Application for environmental remediation of rhodamine B dye aqueous solution

Autor(es)

Padovini, D. S. S. ^[1] ; Magdalena, A. G. ^[1] ; Capeli, R. G. ^[1] ; Longo, E. ^[2] ; Dalmaschio, C. J. ^[3] ; Chiquito, A. J. ^[4] ; Pontes, F. M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista Unesp, Dept Chem, LDMFN, POB 473, BR-17033360 Sao Paulo - Brazil

^[2] Univ Fed Sao Carlos, Dept Chem, CDMF, LIEC, Via Washington Luiz, Km 235, POB 676, BR-13565905 Sao Paulo - Brazil

^[3] Univ Fed Espirito Santo, Dept Nat Sci, BR-29935540 Sao Mateus, ES - Brazil

^[4] Univ Fed Sao Carlos, Dept Phys, NanO LaB, Via Washington Luiz, Km 235, POB 676, BR-13565905 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Materials Chemistry and Physics; v. 233, p. 1-8, MAY 15 2019.
• Citações Web of Science: 1

Resumo

ZrO2@SiO2 core-shell nanostructures were synthesized by a facile two-step hydrothermal plus Stober chemical route. The structure, morphology and properties of the nanoparticles were characterized using X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), UV-Vis spectroscopy, zeta-potential measurements, transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). XRD confirmed the presence of tetragonal ZrO2 crystalline and amorphous SiO2 phases. FTIR analysis confirmed the existence of Zr-O-Si bonds at the surface of the core-shell nanostructures. According to the UV-Vis spectroscopy measurements, the energy band gap value of the uncoated ZrO2 nanoparticles was estimated to be 5.13 eV and the excitation energy (energy band discontinuity) of the ZrO2@SiO2 core-shell nanostructures was found to be 2.31 eV. Transmission electronic microscopy results showed 5-8 run ZrO2 nanoparticles highly crystalline and fully covered by amorphous and uniform SiO2 layer 10-15 nm wide, which is an evidence of the core-shell structure. Photocatalytic performance of ZrO2@SiO2 core-shell nanostructures was carried out using rhodamine B dye in aqueous solution at room temperature under UV light irradiation. ZrO2@SiO2 core-shell nanostructures showed better photocatalytic activities in comparison to the as prepared ZrO2 and SiO2 samples. The enhanced photocatalytic performance for ZrO2@SiO2 core-shell nanostructures may be the result of the Zr-O-Si interfacial layer narrowing the energy gap needed to electron-hole pairs creation, thus enhancing photoinduced charges generation and reducing charges recombination. (AU)

• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 12/14106-2 - Designe de óxidos multifuncionais com arquitetura perovskite (Pb,Sr,La, Bi) (Ti,Fe) O3
• Beneficiário: Fenelon Martinho Lima Pontes
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 11/20536-7 - Materiais Ferroelétricos Multifuncionais: Estudos das Propriedades Ópticas, Elétricas e Fotoluminescente.
• Beneficiário: Debora da Silva Lima Pontes
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/10819-8 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Wagner Benício Bastos
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado