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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.)

Nanostructured KxNa1-xNbO3 hollow spheres as potential materials for the photocatalytic treatment of polluted water

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Praxedes, Fabiano R. [1, 2] ; Nobre, Marcos A. L. [1, 2] ; Poon, Po S. [3] ; Matos, Juan [4] ; Lanfredi, Silvania [1, 2]
Total Authors: 5
[1] Sao Paulo State Univ Unesp, Inst Biosci Humanities & Exact Sci, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil
[2] Sao Paulo State Univ Unesp, Sch Sci & Technol, BR-19060900 Presidente Prudente, SP - Brazil
[3] Univ Concepcion, Unidad Desarrollo Tecnol UDT, Barrio Univ S-N, Concepcion - Chile
[4] Univ Autonoma Chile, Inst Ciencias Quim Aplicadas, Fac Ingn, Santiago 8900000 - Chile
Total Affiliations: 4
Document type: Journal article
Web of Science Citations: 0

Potassium-sodium niobate-based hollows spheres were studied in the photocatalytic degradation of Basic Blue 41 dye in aqueous phase under UV irradiation. KxNa1-xNbO3 materials were prepared at 700 degrees C by the spray pyrolysis method. Photocatalysts were characterized by XRD, SEM, TEM, N-2 adsorption/desorption isotherms and FTIR. Different kinetic models of adsorption, direct photolysis, and photocatalytic degradation of the azo-dye were performed as a function of the pH of solution. The increase in potassium content is responsible of the distortion and polarization of the niobate structure promoting a decrease in the energy band-gap down to 3.01 eV for K0.5Na0.5NbO3. The photocatalytic activity observed on k(0.5)Na(0.5)NbO(3) was up to 23 times higher than that on TiO2 in terms of the surface concentration of the azo-dye molecules adsorbed. A mechanism for the degradation of Basic Blue 41 azo-dye based on the reactive oxygen species detected by scavenger's tests and mass-spectroscopy analysis was proposed. (AU)

FAPESP's process: 20/00781-6 - Heterostructures based on niobates for remediation of organic contaminants
Grantee:Silvania Lanfredi
Support Opportunities: Regular Research Grants
FAPESP's process: 07/03510-9 - Structural characterization of nanopowders of semiconductor ferroelectric oxides
Grantee:Silvania Lanfredi
Support Opportunities: Regular Research Grants
FAPESP's process: 14/11189-0 - Catalytic performance as a function of nanostructuring of new oxides catalysts from the spray pyrolysis method
Grantee:Silvania Lanfredi
Support Opportunities: Regular Research Grants