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Документ Radioprotective cement for long-term storage of nuclear waste(Український державний хіміко-технологічний університет, 2020) Kustov, M. V.; Kalugin, V. D.; Deineka, V. V.; Shabanova, G. M.; Korohodska, A. M.; Slepuzhnikov, E. D.; Deineka, D. M.To enhance the service safety of the geological repositories which are intended for a highly long-term storage of nuclear waste, we proposed coating the walls of repositories with a hermetically sealed radiation-resistant material. To this end, the compounds of a fourcomponent system CaO–BaO–Fe₂O₃–SiO₂ were suggested. Based on these compounds, we developed the technology for the production of special polyfunctional corrosion-resistant cements that can be used for the production of extra strong radiation-protective and corrosion–resistant plugging cements. The thermodynamic analysis revealed probable phase equilibriums and enabled the tetrahedration of the system at the synthesis temperature of 1200 ⁰C, which allowed minimizing the volume of required thermodynamic calculations. The processes of hydration of calcium-barium ferrosilicate cement were investigated. It was established that barium hydrosilicates and calcium and barium hydroferrites of a different basicity are the main hydration products; this provides high strength properties of the cement stone. The obtained materials are cements with a high strength (the compressive strength of 58.9 MPa), enhanced protective and corrosion-resistant properties (the calculated mass absorption coefficient and sulfate-resistance factor being equal to 247 cm²/g and 1.31, respectively). The protective concretes with different fillers, which were fabricated based on the developed cements, have a high strength (ultimate compressive strength of 58.4 MPa), a low level of softening in the temperature range of 20–1200 ⁰C (from 15 to 19%). They can be used at the service temperature of up to 1200 ⁰C.Документ Studying the photocatalytic oxidation of hydroxybenzene in aquatic medium on the photocatalizers SnO₂, ZnO, TiO₂(Технологический центр, 2018) Deineka, D. M.; Kobziev, Oleksandr; Avina, Svitlana; Grin, Svitlana; Deyneka, Viktoriya; Taraduda, Dmytro; Sobina, VitaliyThis paper reports results of research into photocatalytic activity of oxides SnO₂, ZnO, TiO₂ in the process of hydroxybenzene degradation in an aqueous medium with the separately considered properties of the allotrope modifications of titanium oxide (IV): anatase and rutile. The relationship has been substantiated between a decrease in the value for the width of the restricted area and an increase in the photocatalytic activity of the examined oxides. The effect has been established of the organization of agitation on an increase in the degree of hydroxybenzene degradation in an aqueous medium, which is 10‒15 % on average. We have studied the influence of ratio of anatase to rutile in a photocatalyst on the hydroxybenzene degradation efficiency. It has been shown that the results obtained in the course of the study are consistent with data from the scientific literature, while opening up additional possibilities to increase the degree of hydroxybenzene oxidation in a joint application of anatase and rutile. It was established that the greatest degree of oxidation with and without agitation at an irradiation time of 60 minutes can be achieved at the content ratio of anatase to rutile of 75/25 % and is 23 % and 37 %, respectively. The use of such a composition makes it possible to increase the degree of hydroxybenzene oxidation in an aqueous medium by 11‒18 %, which is 1.5‒1.9 times larger in comparison with pure rutile and anatase. The results obtained led to the conclusion on that in order to reduce the time required to achieve the maximal indicators for the process of hydroxybenzene degradation, it is necessary to increase the ratio of the irradiated surface to the height of the device and to increase the Re number of the agitation process. Based on the obtained experimental data, we have established the optimum composition of a photocatalyst, which makes it possible to reach the maximal degree of hydroxybenzene recovery from solution.