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Journal of Nanomaterials - Volume 2016 2016, Article ID 4580516, 12 pages -

Research ArticleDepartment of Materials Chemistry, Institute of Inorganic Chemistry AS CR v.v.i., 250 68 Řež, Czech Republic

Received 1 October 2015; Accepted 27 December 2015

Academic Editor: P. Davide Cozzoli

Copyright © 2016 Václav Štengl et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

h-BN-TiO2 nanocomposites were synthesized by the thermal hydrolysis of titanium peroxo-complexes in the presence of exfoliated h-BN. The bulk h-BN was prepared by annealing mixture of boric acid and urea, and high intensity ultrasound was used for its exfoliation. The prepared samples were characterized by X-ray powder diffraction XRD, infrared spectroscopy, Raman spectroscopy, electron spin resonance ESR, high resolution electron microscopy, BET surface area, and BJH porosity measurement. The UV-Vis diffuse reflectance spectroscopy was employed to estimate band-gap energies. The photoinduced charge on the surface of h-BN-TiO2 nanocomposites was visualized using electric force microscopy EFM. The photocatalytic activity was determined by azo dyes Orange II and Reactive Black 5 photobleaching. The highest rate constant = 0.0762 min

and 0.0164 min

, under UV and visible light irradiation, respectively, showed sample denoted TiP050BN with moderate concentration of h-BN.





Autor: Václav Štengl, Jiří Henych, and Michaela Slušná

Fuente: https://www.hindawi.com/



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