Microwave-assisted synthesis and photocatalytic activity of TiNb2O7 nanoparticles

Reference Presenter Authors
(Institution)
Abstract
13-023 João Batista Rodrigues Neto Rodrigues Neto, J.B.(Federal University of Santa Catarina); Falk, G.S.(Federal University of Santa Catarina); Borlaf, M.(Empa, Überlandstrasse); Novaes de Oliveira, A.P.(Universidade Federal de Santa Catarina); Moreno, R.(Instituto de cerámica y vidrio); In this work, a simple and efficient synthesis methodology for obtaining TiNb2O7 nanoparticles was developed by combining colloidal sol-gel and microwave assisted hydrothermal synthesis. Secondary thermal treatments (500, 600 and 700 °C for 1 h) were carried out to evaluate the influence of crystallinity on the photocatalytic activity of the material. As-prepared and thermal treated TiNb2O7 nanoparticles were characterized by differential thermal analysis, DRX, TEM and Raman spectroscopy. Photocatalytic activities of the prepared samples were evaluated by the degradation of methylene blue as a probe. The obtained results indicate that microwave heating at temperature as low as 180 °C for 20 min was enough to obtain nanoparticles. Secondary thermal treatments led to the crystallization of the TiNb2O7-monoclinic phase. It has been found that increased crystallinity has a significant influence on photocatalytic activity.
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