h-BN-TiO2 Nanocomposite for Photocatalytic Applications

0458194 - ÚACH 2017 RIV US eng J - Journal Article
Štengl, Václav - Henych, Jiří - Slušná, Michaela
h-BN-TiO2 Nanocomposite for Photocatalytic Applications.
Journal of Nanomaterials. Roč. 2016, č. 2016 (2016), č. článku 4580516. ISSN 1687-4110. E-ISSN 1687-4129
Grant - others:NATO(US) SPS984599
Program: Science for Peace and Security
Institutional support: RVO:61388980
Keywords : Hexagonal boron-nitride * Aqueous-solution * Bandgap energy
Subject RIV: CA - Inorganic Chemistry
Impact factor: 1.871, year: 2016

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 k = 0.0762 min(-1) and 0.0164 min(-1), under UV and visible light irradiation, respectively, showed sample denoted TiP050BN with moderate concentration of h-BN.
Permanent Link: http://hdl.handle.net/11104/0258482