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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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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]
Total Authors: 7
[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
Total Affiliations: 4
Document type: Journal article
Source: Materials Chemistry and Physics; v. 233, p. 1-8, MAY 15 2019.
Web of Science Citations: 0

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)

FAPESP's process: 11/20536-7 - Multifunctional ferroelectric materials: studies of optical, electrical and photoluminescent properties
Grantee:Debora da Silva Lima Pontes
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 17/10819-8 - CDMF - Center for the Development of Functional Materials
Grantee:Wagner Benício Bastos
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 12/14106-2 - Designe multifunctional oxides with perovskite architecture (Pb, Sr, La, BI) (Ti, Fe) O3
Grantee:Fenelon Martinho Lima Pontes
Support type: Regular Research Grants