Modern Photoactive Nanocomposites Based on TiO2 and CeO2
| Authors | M.M. Zahornyi1 , O.M. Lavrynenko1 , O.F. Kolomys2 , V.V. Strelchuk2 , N.I. Tyschenko1 , O.A. Korniіenko1, A.I. Ievtushenko1 |
| Affiliations |
1I. Frantsevich Institute for Problems of Materials Science, NAS of Ukraine, 3 Krzhizhanovsky st., 03142 Kyiv, Ukraine 2V. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine, 45 Nauky pr., 03028 Kyiv, Ukraine |
| Е-mail | |
| Issue | Volume 15, Year 2023, Number 4 |
| Dates | Received 23 May 2023; revised manuscript received 19 August 2023; published online 30 August 2023 |
| Citation | M.M. Zahornyi, O.M. Lavrynenko, O.F. Kolomys, и др., J. Nano- Electron. Phys. 15 No 4, 04001 (2023) |
| DOI | https://doi.org/10.21272/jnep.15(4).04001 |
| PACS Number(s) | 32.30.Rj, 33.20.Lg, 42.62.Fi, 61.46. – W, 77.22. – d |
| Keywords | Photocatalysis (4) , UV irradiation, Optical activity, Ag (224) , Malachite Green, Discoloration. |
| Annotation |
The unique surface, optical and photocatalytic properties of nanomaterials based on various oxide nanoparticles have found wide application in wastewater treatment. In a number of modern scientific studies, bioactive catalysts based on TiO2, which exhibit redox activity in water purification, were considered. The presented structures based on titanium dioxide, formed in binary and ternary systems in the presence of silver and cerium with a different degree of crystallinity were obtained by the chemical precipitation method using titanium tetraisopropoxide (TTIP) as a precursor species. XRD data confirmed a homogeneous composition of powders formed in binary systems (anatase with clusters of Ag and CeO2) with CSR in the range of 9-20 nm. It was stated that in ternary systems, with an increase in the content of doping components, d spacing (101) of anatase's lattice shifted to the right, and the degree of tetragonality increased to 2.53. Raman results showed that the most intense band of Eg mode for doped samples TiO2 was shifted from 144 to 152 cm – 1 compared to anatase dependence on the noble metal concentration. The features of the silver-ceria and silver – titania interactions are connected with the size effects of both Ag and CeO2 particles, concentrations of oxygen vacancies in the ceria structure, and possible redox properties due to the interplay between Ag+/Ag0 and Ce3+/Ce4+ pair (PL) and a Schottky barrier between the metal and TiO2 and photoexcited electrons in the semiconductor are trapped by Ag nanoparticles. It was shown that the ternary composite TiO2 & CeO2 & Ag (2 wt. %) has improved photocatalytic activity due to the inclusion of CeO2 in the crystal lattice of anatase, which is confirmed by an increase in the degree of tetragonality of the lattice and prevention of oxidation of silver clusters on the surface of anatase under the influence of UV irradiation. These photocatalysts will be a perspective to the hydrogen synthesis technology. |
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List of References |
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