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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.)

Influence of calcination parameters on the synthesis of N-doped TiO2 by the polymeric precursors method

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Author(s):
Dawson, Margaret [1] ; Soares, Gabriela Byzynski [2, 3] ; Ribeiro, Caue [3]
Total Authors: 3
Affiliation:
[1] Univ Fed Sao Carlos, Dept Mat Engn, BR-13565905 Sao Carlos, SP - Brazil
[2] Univ Fed Sao Carlos, Dept Chem, BR-13565905 Sao Carlos, SP - Brazil
[3] Embrapa Instrumentacao, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of Solid State Chemistry; v. 215, p. 211-218, JUL 2014.
Web of Science Citations: 9
Abstract

In this paper, the influence of calcination parameters on the synthesis of N:TiO2 catalysts obtained through the polymeric precursors method was evaluated. The powders were prepared by annealing Ti4+ precursor resins at different temperature-time conditions in air, resulting in powders with different degrees of crystallinity for N doping, which was done by adding urea to the as-prepared powders and calcining in N-2 atmosphere. The N doping process resulted in band gap narrowing of TiO2 and, varying annealing temperature and time, can be an alternative method for preferential formation of substitutional N or interstitial N. It was found that the percentage of interstitial N increased with an increase in annealing temperature, resulting in the complete absence of substitutional N at 400 degrees C. The photocatalytic performance of the powders was evaluated using Rhodamine-B and Atrazine solutions under ultraviolet and visible irradiations. The coefficients revealed that interstitial N had a positive correlation to both ultraviolet and visible photoactivity. In contrast, substitutional N showed a negative correlation. Further, the ratio of substitutional N to interstitial N indicated a strong negative correlation to ultraviolet light photoactivity and no correlation to visible light photoactivity. However, substitutional N should be controlled for better photocatalytic properties. (C) 2014 Elsevier Inc. All rights reserved. (AU)

FAPESP's process: 09/10998-3 - Kinetic parameters involved in the photodegradation of pesticides catalyzed by TiO2 nanoparticles: comparative studies on the contribution of charge transfer and free radicals oxidation
Grantee:Gabriela Byzynski Soares
Support Opportunities: Scholarships in Brazil - Doctorate