Nazarii Danyliuk

Vasyl Stefanyk Precarpathian National University

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ТТ

Тетяна Татарчук

Vasyl Stefanyk Precarpathian National University

Alexander Shyichuk

Vasyl Stefanyk Precarpathian National University

Volodymyr Kotsyubynsky

Vasyl Stefanyk Precarpathian National University

Ivanna Lapchuk

Vasyl Stefanyk Precarpathian National University

Volodymyr Mandzyuk

Weatherford College

Mu. Naushad

King Saud University

Wojciech Macyk

Jagiellonian University

Ivan Mironyuk

Vasyl Stefanyk Precarpathian National University

V. Hušák

Vasyl Stefanyk Precarpathian National University

Igor Mykytyn

Vasyl Stefanyk Precarpathian National University

Cooperative Institutions

Vasyl Stefanyk Precarpathian National University

Jagiellonian University

Bydgoszcz University of Science and Technology

AGH University of Krakow

Ivano-Frankivsk National Medical University

Taras Shevchenko National University of Kyiv

Weatherford College

Chernivtsi National University

Glocal University

Institute of Chemistry of New Materials of the National Academy of Sciences of Belarus

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Structural, morphological and photocatalytic properties of nanostructured TiO2/AgI photocatalyst

Physics and Chemistry of Solid State (2023)

Ivan Mironyuk Nazarii Danyliuk Liliia Turovska Igor Mykytyn Volodymyr Kotsyubynsky

Nanostructured TiO2/AgI photocatalyst under the action of ultraviolet or visible electromagnetic radiation effectively neutralizes organic pollutants in the aqueous environment. It is a nanostructure in which micro- and small mesopores of anatase TiO2 are filled with silver iodide in the superionic state. The content of the α-AgI ion-conducting phase in the volume of ТіО2 pores can be ~20 wt %. To obtain a photocatalyst, titanium dioxide is synthesized by the sol-gel method, using a titanium aquacomplex solution [Ti(OH2)6]3+•3Cl- and a Na2CО3 modifier additive as a precursor. The modifying additive during synthesis ensures the fixation of =О2СО carbonate groups on the surface of oxide material particles. The presence of these groups leads to an increase in both the pore volume and the specific surface area of ТіО2. The specific surface area of carbonized titanium dioxide is 368 m2•g-1, the pore volume is 0.28 cm3•g-1, and their size is 0.9-4.5 nm. To fill the micro- and small mesopores of TiO2 with the superionic α-AgI phase, Ag+ cations are first adsorbed from the AgNO3 solution on the titanium dioxide surface, and then the oxide material is contacted with the KI solution. Compared to the Evonik P25-TiO2 photocatalyst, the nanostructured TiO2/AgI photocatalyst demonstrates a significantly higher efficiency of photodegradation of organic dyes Congo Red and Methyl Orange in visible and ultraviolet radiation. The most active ТіО2/40AgI sample achieved complete degradation of the CR dye in 6 minutes of UV irradiation, while the efficiency of commercial Р25-TiO2 over the same time was only 42%.

Titanium Dioxide

Photodegradation

Methyl orange

Specific surface area

Titanium oxide

Visible spectrum

10.15330/pcss.24.2.374-384

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Citations (2)

Catalytic activity of magnetite and its magnetic heating properties

Materials Today Proceedings (2022)

Тетяна Татарчук Nazarii Danyliuk Ivanna Lapchuk Alexander Shyichuk Volodymyr Kotsyubynsky

Oxidizing agent

10.1016/j.matpr.2022.03.494

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Bacteria inactivation using spinel cobalt ferrite catalyst

Physics and Chemistry of Solid State (2023)

Nazarii Danyliuk Ivanna Lapchuk Тетяна Татарчук Р. В. Куцык Volodymyr Mandzyuk

The E. coli inactivation using hydrogen peroxide (H2O2) and cobalt ferrite granulated catalyst was investigated in a fixed-bed flow reactor. CoFe2O4 catalyst was synthesized by the co-precipitation method, granulated, and annealed at 1150°C. X-ray diffraction analysis was used to identify the crystal structure of the catalyst. CoFe2O4 catalyst demonstrates good catalytic activity for bacteria inactivation in the presence of H2O2. An increase in the hydrogen peroxide concentration increases the inactivation efficiency. The reactor demonstrates the E. coli inactivation of 99.94% at the H2O2 hydrogen peroxide concentration of 15 mM and initial bacterial concentration of 6·103 CFU/L. The water disinfection using a fixed-bed reactor demonstrates the broad prospects for industrial use.

Cobalt Ferrite

Peroxide

10.15330/pcss.24.2.256-261

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Optimization of TiO2-P25 photocatalyst dose and H2O2 concentration for advanced photo-oxidation using smartphone-based colorimetry

Water Science & Technology (2021)

Nazarii Danyliuk Тетяна Татарчук Karthik Kannan Alexander Shyichuk

Abstract Color images taken by a smartphone camera were used to estimate the rate of advanced photo-oxidation reaction of Direct Red 23 (DR23) azo dye as a model organic pollutant. The red, green, blue color coordinates were tested to quantify the dye. Images of the reaction mixture were taken at specified intervals to obtain kinetic lines and reaction rate constants. Both the reaction rate constant and the final degree of degradation were plotted as functions of the photocatalyst dose and the concentration of H2O2. The smartphone measurements are fully consistent with the reference spectrophotometry data. The maximum degradation efficiency of the DR23 dye was recorded at C0(H2O2) = 2.5 mM and photocatalyst dose equal to 1.0 mg/L. Higher H2O2 concentrations reduce the degradation rate as a result of the side reaction of H2O2 with OH radicals. A two-factor experimental design was used to study the effects of photocatalyst dose and H2O2 concentration with five and seven levels, respectively. The analysis of variance results indicated that the concentration of H2O2 had the greater influence. The smartphone provides quick and easy measurement of the photodegradation rate directly in the solutions without sampling. The proposed approach can be applied under field conditions in wastewater treatment plants.

Photodegradation

Degradation

Colorimetry

Spectrophotometry

Reaction rate

10.2166/wst.2021.236

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Citations (24)

Toxicity of water treated with Fenton-like ferrite catalyst

Physics and Chemistry of Solid State (2024)

Nazarii Danyliuk Ivanna Lapchuk V. Hušák

Recently, there has been a rapid growth in the use of nanoparticles in water treatment processes. However, an important task is to study the toxicity of the materials used and the reaction products formed. The purpose of this study was to evaluate the impact of the proposed water treatment method on the ecosystem. Algae are excellent model organisms for studying the toxic effects of catalyst nanoparticles. This work investigates the toxicity of cobalt ferrite (CoFe2O4) and hydrogen peroxide (H2O2) on the microalgae Chlorella vulgaris Beij. (C. vulgaris). The growth rate of C. vulgaris depends on the residual concentration of H2O2, indicating a stressful physiological state of the microalgae. Exposure to sintered cobalt ferrite granules does not affect the growth of freshwater algae. At a residual H2O2 concentration of 11.9 mM, algal cells' morphology, membrane integrity, and viability were severely impaired. Hydrogen peroxide is known to cause oxidative stress, as evidenced by a decrease in the growth rate of C. vulgaris and an increase in the number of dead cells. The study showed that the high residual concentration of H2O2 is the main obstacle to the discharge of treated water into the natural ecosystem.

10.15330/pcss.25.1.170-177

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Halloysite nanotubes and halloysite-based composites for environmental and biomedical applications

Journal of Molecular Liquids (2020)

Nazarii Danyliuk Jolanta Tomaszewska Тетяна Татарчук

Halloysite

10.1016/j.molliq.2020.113077

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Citations (152)

Synthesis, structure and morphology of magnesium ferrite nanoparticles, synthesized via “green” method

Physics and Chemistry of Solid State (2021)

Тетяна Татарчук Mariana Myslin Ivanna Lapchuk Ostap Olkhovyy Nazarii Danyliuk

In this paper, the synthesis of spinel magnesium ferrite (MgFe2O4) nanoparticles is reported, along with its structural, magnetic and hyperthermic properties, which ensure them being effectively used in various fields. Firstly, magnesium ferrite was synthesized via sol-gel auto-combustion method, using honey as the reducing agent. The crystallite size was calculated via the Scherrer method, the modified Scherrer method, the Williamson-Hall method, and the size-strain plot (SSP) method. X-ray analysis was used to confirm the structure of the spinel. For morphological study of ferrite nanoparticles, scanning electron microscopy (SEM) was used. Finally, hyperthermic properties of magnesium ferrite were analyzed for potential usage in medicine. According to these results, spinel magnesium ferrite (MgFe2O4) nanoparticles proved to be suitable for destruction of cancer cells, as they can be heated to the desired temperature, which will increase the sensitivity of those cells.

10.15330/pcss.22.2.195-203

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Citations (19)

Copper-substituted magnetite as a Fenton-like catalyst boosted with electromagnetic heating

Journal of Water Process Engineering (2024)

Тетяна Татарчук Alexander Shyichuk Mu. Naushad Nazarii Danyliuk Ivanna Lapchuk

10.1016/j.jwpe.2024.105170

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Citations (2)

Enhanced Activity of La-Substituted Nickel–Cobalt Ferrites in Congo Red Dye Removal and Hydrogen Peroxide Decomposition

Water Air & Soil Pollution (2024)

Iryna Starko Тетяна Татарчук Mu. Naushad Nazarii Danyliuk