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

Photodegradation of phenol red on a Ni-doped niobate/carbon composite

Full text
Lanfredi, Silvania [1] ; Nobre, Marcos A. L. [1] ; Moraes, Paula G. P. [2] ; Matos, Juan [3]
Total Authors: 4
[1] Univ Estadual Paulista, UNESP, Fac Ciencias & Tecnol FCT, BR-19060900 Presidente Prudente, SP - Brazil
[2] Univ Estadual Paulista, UNESP, Inst Biociencias Letras & Ciencias Exatas, Slio Jose Do Rio Preto, SP - Brazil
[3] Venezuelan Inst Sci Res IVIC, Dept Photocatalysis & Alternat Energies, Caracas - Venezuela
Total Affiliations: 3
Document type: Journal article
Source: CERAMICS INTERNATIONAL; v. 40, n. 7, A, p. 9525-9534, AUG 2014.
Web of Science Citations: 11

The photocatalytic activity of a new nanostructured Ni-doped niobate KSr2(Ni0.75Nb4.25)O15-delta was studied using the phenol red dye as a test molecule and the influence of amorphous carbon deposits upon the photoactivity of the niobate-based materials was also verified. KSr2(Ni0.75Nb4.25)O15-delta powder was prepared by a high energy ball milling method and the C-KSr2(Ni0.75Nb4.25)O15-delta composite by the partial pyrolysis of the niobate dispersed in a polyester matrix. Materials were characterized by FM spectroscopy and X-ray diffraction (XRD). The diffraction line profile and the refinement of the structural parameters of KSr2(Ni0.75Nb4.25)O15-delta were derived by the Rietveld method. Both samples showed similar phenol red photodegradation under steady-state kinetic conditions. However, amorphous carbon seems to beneficially affect the reaction mechanism which followed first order kinetics. In terms of KSr2(Ni0.75Nb4.25)O15-delta concentration a clear enhancement in the photoactivity of the niobate in the presence of amorphous carbon by a factor 4.7 was found suggesting a synergy effect between both solids. We conclude that C-KSr2(Ni0.75Nb4.25)O15-delta composite can be employed for the photocatalytic degradation of diluted pollutants. (c) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved. (AU)

FAPESP's process: 07/03510-9 - Structural characterization of nanopowders of semiconductor ferroelectric oxides
Grantee:Silvania Lanfredi
Support type: Regular Research Grants