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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.)

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

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Author(s):
Lanfredi, Silvania [1] ; Nobre, Marcos A. L. [1] ; Moraes, Paula G. P. [2] ; Matos, Juan [3]
Total Authors: 4
Affiliation:
[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
Abstract

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