Roman Smotraiev

Roman Smotraiev
Ukrainian State University of Chemical Technology · Department of Inorganic Substances Technology and Ecology

PhD

About

35
Publications
4,457
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44
Citations
Citations since 2016
9 Research Items
31 Citations
201620172018201920202021202201234567
201620172018201920202021202201234567
201620172018201920202021202201234567
201620172018201920202021202201234567
Additional affiliations
September 2004 - present
Ukrainian State University of Chemical Technology
Position
  • Professor (Associate)

Publications

Publications (35)
Article
This study proposes pre-polymerised zirconium salts with different basicities as alternative coagulants for domestic wastewater treatment. We compared the efficiency of pre-polymerised zirconium coagulants and commercial aluminium coagulants (pre-polymerised polyaluminium chloride and aluminium sulphate) in simultaneously removing turbidity (TU), t...
Article
The chemisorption of sulfur(IV) oxide (SO2) from air by natural aqueous media containing iron (Fe) ions is a current area of research interest. At the same time, studies of SO2 absorption from gases with higher concentrations of SO2 and at high temperature by solutions containing Fe compounds are not enough to predict the purification process of in...
Article
CaCO3 microparticles were obtained by chemical precipitation from CaCl2 solution using Na2CO3 or (NH4)2CO3 solutions (heterogeneous precipitation) or carbamide (homogeneous precipitation) as precipitation agents. The effects of various experimental conditions, such as the temperature, duration and reagent ratio on the properties of precipitated CaC...
Conference Paper
A promising method is the use of multifunctional sorbents to simultaneously desalinate and disinfect water. Silver nanodispersion stabilized by sodium alginate (Ag0-AlgNa) was chosen as an antibacterial agent. Ag-doped Zr(IV) and Al(III) oxyhydroxides adsorbents were synthesized by combination of sol-gel and reagentless plasma-chemical methods. The...
Conference Paper
Full-text available
Nowadays , the population of Earth has been rising. People observe urbanization, development of industry , energy and transport. These all lead to appearance of a big amount of wastewater. Currently, there is no doubt of needing to develop and improve the treatment processes. This days, increasingly used methods of water purification with the help...
Article
Full-text available
Calcium carbonate is on of widely used fillers of composite materials. The area of its application depend on disperse structure, particle shape and other. The modification of calcium carbonate by high-molecular polymers allows changing its characteristics and surface properties in a wide range. The modification of calcium carbonate often carried ou...
Article
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Sorbents based on xerogels of zirconium, aluminum and manganese oxyhydroxides. The actual problem of water supply in the world and in Ukraine, in particular, is a high level of pollution in water resources and an insufficient level of drinking water purification. With industrial wastewater, a significant amount of pollutants falls into water bodies...
Article
Full-text available
The absorption kinetics of sulfur oxide(IV) by solutions of iron(II) and iron(III) salts was investigated. It was found that the absorption of sulfur oxide(IV) by solutions of iron(II) and iron(III) salts in the diffusion region proceeds in two stages: the first stage occurs by the absorption mechanism with a rapid irreversible reaction in the liqu...
Article
Full-text available
The hydrolysis kinetics of aluminum and zirconium oxychloride salts in the presence of carbamide was investigated. The determined rate constant varies in the range of 0.0027–0.0038 min−1 and is independent on initial mixture composition. The effect of initial components molar ratio and concentration on formation of sol particles was established. As...
Chapter
Full-text available
Abstract Composite adsorbents based on zirconium oxyhydroxide (ZOH) with adding of Al2O3, Fe2O3 and Mn3O4 were synthesized by a sol-gel method to remove of As(V) and As(III) from drinking water. The characterization of adsorbents and their adsorption behavior are investigated. Due to the high specific surface area, from 355 to 541 m2/g and the pres...
Book
Although the water is abundant at first thought, only < 0.003 % is available for our domestic, industrial and other uses. That limited amount unevenly and unfairly distributed among the current population of about 7 billion people. Not only that, the water is wasted, polluted, unsustainably used and unappreciated in many parts of the world. Thus,...
Article
Full-text available
Series of spherically granular sorbents based on hydrated oxides of zircon, alumina and their mixtures with following composition n Zr : n Al = 1 : 0, 2 : 1, 1 : 1, 1 : 2 и 0 : 1 was obtained with sol-gel method. In order to study the electrosurface and acid-base properties of the sorbents the method of potentiometric titration and spectrophotometr...
Article
Full-text available
Investigation of porous structure characteristics of the sorbents based of hydrated zircon and aluminum oxides. Studied is the influence of duration of the sol formation pro-cess in zirconium and aluminum salt solutions with different original ratio of salts on the specific surface area and porosity of sorbents based on hydrated zircon and aluminum...
Article
Full-text available
By spectrophotometer have defined nature and number of the active centers on the surface the spherically granulated hydrated oxides of zirconium, aluminum and mixtures thereof have investigated the distribution centers acid-base indicator from pKa. Investigate the regularity “composition – method of production – surface properties”
Article
Full-text available
The thermodynamics of process absorption of dioxide sulfur electrochemical is investigated by the processed water solution of salts iron. It is established that existence ions of iron(ІІ) and the hydroxide ions, being formed in the course of electrochemical processing of absorbing solution, displaces balance of process absorption towards formation...
Article
The processes of coagulation and gelation of sols in zirconium oxychloride aqueous solutions and the properties of hydrated zirconium dioxide sols (pH, particles size, dynamic viscosity) depending on the aging conditions of partially neutralized zirconium oxychloride feedstock solution-zirconyl hydroxychloride used for the synthesis and molar ratio...
Article
Full-text available
Визначено склад кремнійвмісних відходів флотаційного збагачення залізної руди. Досліджено процес очищення цих відходів від сполук заліза. Визначений максимальний ступінь вилучення заліза із вихідних відходів не перевищує 67 %. Для підвищення ступеню вилучення необхідне подрібнення відходів. Одержані зразки рідкого скла містять незначну кількість сп...
Article
Full-text available
Calcium carbonate deposition with the help of sodium and ammonium carbonates was investigated. It has been studied the degree of calcium ions transformation depending on such different parameters as the initial concentration, temperature, displacement order and reagent excess. Parameters of the process providing the maximum degree of calcium ion tr...
Article
Full-text available
It is investigated kinetic characteristics of process of heterogeneous reduction Fe3 + to Fe2 + in the fulfilled solutions of chloride of iron (ІІІ) by means of a tin. It is established, that reduction process can proceed in three modes: outwardlydiffusion, intradiffusion and kinetic. At frequency of hashing more than 150-200 turns/minute outwardly...
Article
Full-text available
Исследован процесс восстановления Fe3+ до Fe2+ в модельных и отработанных растворах хлорида железа (ІІІ). Получены экспериментальные данные влияния различных технологических параметров на процесс восстановления. Установлено, что процесс восстановления в модельном и промышленном растворах проходит с одинаковой скоростью, которая зависит главным обра...
Article
Full-text available
Для извлечения меди и цинка из катализатора НТК-4 был применен способ жидкостной экстракции. Проведенные исследования были направлены на выявление общих закономерностей степени извлечения меди и цинка из катализатора НТК-4 от технологических параметров. Проведенные исследования извлечения цинка и меди из катализатора НТК-4 показали, что предложенны...
Article
Full-text available
It is investigated process washing pigmentary oxihydroxide the iron received by chemical sedimentation by a mix of ammonia with air, from chloride - ions. Dependences of parameters of a filtration of a deposit on conditions of sedimentation and concentration chloride-ions in washing waters and in a deposit from parameters washing are determined. Op...
Article
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Исследовано влияние условий отверждения карбамидоформальдегидных олигомеров (КФО) в растворах оксихлорида циркония на степень извлечения циркония из растворов и определена адсорбционная емкость КФО по ионам циркония. Определены технологические параметры процесса соосаждения, позволяющие достичь максимальной степени извлечения циркония для исследуем...
Article
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Исследована кинетика образования нанодисперсных частиц гидроксида алюминия в золях при гомогенном гидролизе нитрита алюминия с карбамидом. Получены кинетические характеристики роста частиц в диапазоне от 5 до 35 нм. Предложены механизм образования нанодисперсных частиц золя и полуэмпирическое уравнение, описывающее рост частиц в начальный момент вр...
Article
Full-text available
Is carried out joint hydrolysis of salts of aluminum with carbamide and the gels, sols and powders hydroxide of aluminum are received. Are determined the order, constant of speed, energy of activation and preexponential factor of reaction joint hydrolysis
Article
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Из золей гидратированного диоксида циркония были извлечены частицы золя с помощью карбамидоформальдегидных полимеров. Порошок диоксида циркония, полученный после прокаливания полимерсодержащего порошка, характеризуется высокой монодисперсностью и преимущественно состоит из частиц с размером 400-500 нм (92 %), которые в свою очередь состоят из сфери...
Article
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Изучены свойства золей гидроксида циркония полученных методом гомогенного гидролиза в присутствии карбамида. Доказана возможность получения стабильных концентрированных золей непосредственно из водных растворов неорганических солей циркония. Определен размер частиц стабильных золей, который должен быть близок к размеру первичных частиц The propert...
Article
Full-text available
The sorption of molybdenum ions on the pure carbomidoformaldehyde polymers and those codeposited with molybdenum ions has been studied. The absorption isoterms of molybdenum ions from its solution have been obtained. The dependences between the rate of metal extraction from the solution at different concentration and the aging time of polymers have...
Article
Full-text available
По результатам зависимости константы скорости гидролиза от температуры был построен график зависимости lnK = f(1/T) и рассчитаны энергии активации реакции и предэкспоненциальные множители для совместного гидролиза оксихлорида либо оксинитрата циркония с карбамидом, соответственно Е=124219 Дж/моль, К0=1,325.1013 с-1, Е=127484 Дж/моль, К0=3,83.1013 с...
Article
Full-text available
Изучена возможность получения монодисперсного порошка диоксида циркония при осаждении на карбамидоформальдегидных полимерах The sizes of zirconium dioxide powder particles obtained by an industrial method ahd a deposition in presence of carbamid- formaldehyde polymers are determined. The advantage of a zirconium dioxide obtaining in presence of car...

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Projects

Projects (4)
Project
Water Harmony Erasmus + - No. 561755-EPP-1-2015-1-NO-EPPKA2-CBHE-JP - “Harmonization of diploma education related to water resources” (funding was carried out in accordance with the Framework Agreement between the Government of Ukraine and the Commission of the European Community under the Erasmus + , КА2) - aimed at developing the potential of higher education. The project provides for the harmonization of teaching practices and methodological approaches for graduate and postgraduate studies in 10 partner universities from China, Germany, Norway, Poland, Sri Lanka, Ukraine. Improving the quality of education is achieved through the development of curricula, improved teaching and learning tools, methodologies and pedagogical approaches using the world's best practices.
Project
Water H-II is aimed at developing and expanding the project initiative - CPEA-2011/10002 “Water Harmony - Integration of Education, Research, Innovation and Entrepreneurship” (with the financial support of the Norwegian Center for International Cooperation in Education (SIU) on the basis of an agreement with the Norwegian By the Ministry of Foreign Affairs). Also, the creation of a scientific and pedagogical consortium, including 10 partner universities from Belarus, Kazakhstan, Kyrgyzstan, the Republic of Moldova, Tajikistan, Ukraine and Norway, to harmonize higher education related to water resources, in order to increase its relevance and quality. Improving the quality of education is supported by modern teaching tools, teaching methodologies, pedagogical approaches with flexible learning paths, virtual and physical mobility, blended courses, internships, etc. In addition, attention is paid to ensuring the quality of education, the development of research and innovation potential, which are among the regional priorities.