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Zdorovets MV, Borgekov DB, Zhumatayeva IZ, Kenzhina IE, Kozlovskiy AL. Synthesis, Properties and Photocatalytic Activity of CaTiO 3-Based Ceramics Doped with Lanthanum. Nanomaterials (Basel) 2022; 12:nano12132241. [PMID: 35808076 PMCID: PMC9268022 DOI: 10.3390/nano12132241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 06/26/2022] [Accepted: 06/28/2022] [Indexed: 11/28/2022]
Abstract
The aim of this work is to study the effect of lanthanum doping on the phase formation processes in ceramics based on CaTiO3, as well as to evaluate the effectiveness of the ceramics as photocatalysts for the decomposition of the organic dye Rhodamine B. The methods used were scanning electron microscopy to evaluate the morphological features of the synthesized ceramics, X-ray diffraction to determine the phase composition and structural parameters, and UV-Vis spectroscopy to determine the optical properties of the ceramics. During the experiments it was found that an increase in the lanthanum dopant concentration from 0.05 to 0.25 mol leads to the formation of the orthorhombic phase La0.3Ca0.7TiO3 and the displacement from the ceramic structure of the impurity phase TiO2, which presence is typical for the synthesized ceramics by solid-phase synthesis. On the basis of the data of the X-ray phase analysis the dynamics of phase transformations depending on concentration of lanthanum was established: CaTiO3/TiO2 → CaTiO3/La2TiO5 → CaTiO3/La0.3Ca0.7TiO3 → La0.3Ca0.7TiO3. During the determination of photocatalytic activity it was found that the formation of La0.3Ca0.7TiO3 phase leads to an increase in the decomposition rate as well as the degree of mineralization.
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Affiliation(s)
- Maxim V. Zdorovets
- Laboratory of Solid State Physics, The Institute of Nuclear Physics, Ibragimov St., Almaty 050032, Kazakhstan; (M.V.Z.); (D.B.B.); (I.E.K.)
- Engineering Profile Laboratory, L.N Gumilyov Eurasian National University, Satpayev St., Nur-Sultan 010008, Kazakhstan;
- Department of Intelligent Information Technologies, Ural Federal University, 620075 Yekaterinburg, Russia
| | - Daryn B. Borgekov
- Laboratory of Solid State Physics, The Institute of Nuclear Physics, Ibragimov St., Almaty 050032, Kazakhstan; (M.V.Z.); (D.B.B.); (I.E.K.)
- Engineering Profile Laboratory, L.N Gumilyov Eurasian National University, Satpayev St., Nur-Sultan 010008, Kazakhstan;
| | - Inesh Z. Zhumatayeva
- Engineering Profile Laboratory, L.N Gumilyov Eurasian National University, Satpayev St., Nur-Sultan 010008, Kazakhstan;
| | - Inesh E. Kenzhina
- Laboratory of Solid State Physics, The Institute of Nuclear Physics, Ibragimov St., Almaty 050032, Kazakhstan; (M.V.Z.); (D.B.B.); (I.E.K.)
- Department of General Physics, Satbayev University, Almaty 050032, Kazakhstan
| | - Artem L. Kozlovskiy
- Laboratory of Solid State Physics, The Institute of Nuclear Physics, Ibragimov St., Almaty 050032, Kazakhstan; (M.V.Z.); (D.B.B.); (I.E.K.)
- Engineering Profile Laboratory, L.N Gumilyov Eurasian National University, Satpayev St., Nur-Sultan 010008, Kazakhstan;
- Correspondence: ; Tel./Fax: +7-702-441-3368
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Kozlovskiy AL, Zhumatayeva IZ, Mustahieva D, Zdorovets MV. Phase Transformations and Photocatalytic Activity of Nanostructured Y 2O 3/TiO 2-Y 2TiO 5 Ceramic Such as Doped with Carbon Nanotubes. Molecules 2020; 25:molecules25081943. [PMID: 32331375 PMCID: PMC7221757 DOI: 10.3390/molecules25081943] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Revised: 04/20/2020] [Accepted: 04/22/2020] [Indexed: 01/08/2023]
Abstract
This work is devoted to the study of phase transition processes in nanostructured ceramics of the Y2O3/TiO2-Y2TiO5 type doped with carbon nanotubes as a result of thermal annealing, as well as to the assessment of the prospects of the effect of phase composition on photocatalytic activity. By the method of X-ray phase analysis, it was found that an increase in the annealing temperature leads to the formation of the orthorhombic phase Y2TiO5, as well as structural ordering. Based on the obtained UV spectra, the band gap was calculated, which varies from 2.9 eV (initial sample) to 2.1 eV (annealed at a temperature of 1000 °C). During photocatalytic tests, it was established that the synthesized nanostructured ceramics Y2O3/TiO2-Y2TiO5 doped CNTs show a fairly good photocatalytic activity in the range of 60–90% decomposition of methyl orange.
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Affiliation(s)
- Artem L. Kozlovskiy
- Engineering Profile Laboratory, L.N. Gumilyov Eurasian National University, Nur-Sultan 010008, Kazakhstan; (I.Z.Z.); (D.M.); (M.V.Z.)
- Laboratory of Solid State Physics, The Institute of Nuclear Physics, Almaty 050032, Kazakhstan
- Laboratory of Additive Technologies, Kazakh-Russian International University, Aktobe 030006, Kazakhstan
- Correspondence: ; Tel.:+77024413368; Fax: +77024413368
| | - Inesh Z. Zhumatayeva
- Engineering Profile Laboratory, L.N. Gumilyov Eurasian National University, Nur-Sultan 010008, Kazakhstan; (I.Z.Z.); (D.M.); (M.V.Z.)
| | - Dina Mustahieva
- Engineering Profile Laboratory, L.N. Gumilyov Eurasian National University, Nur-Sultan 010008, Kazakhstan; (I.Z.Z.); (D.M.); (M.V.Z.)
| | - Maxim V. Zdorovets
- Engineering Profile Laboratory, L.N. Gumilyov Eurasian National University, Nur-Sultan 010008, Kazakhstan; (I.Z.Z.); (D.M.); (M.V.Z.)
- Laboratory of Solid State Physics, The Institute of Nuclear Physics, Almaty 050032, Kazakhstan
- Department of Intelligent Information Technologies, Ural Federal University, 620075 Yekaterinburg, Russia
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