Oleg Tkachenko

• Doctor of Philosophy
• Senior Researcher at V. N. Karazin Kharkiv National University

The valorization of lignin into advanced materials for water and soil remediation is experiencing a surge in demand. However, it is imperative that material research and manufacturing be sustainable to prevent exacerbating environmental issues. Meeting these requirements necessitates a deeper understanding of the role of lignin’s functional groups...

The valorization of lignin into advanced materials for water and soil remediation is experiencing a surge in demand. However, it is imperative that material research and manufacturing are sustainable to prevent exacerbating environmental issues. Meeting these requirements necessitates a deeper understanding of the role of lignin’s functional groups...

The study presents a streamlined one-step process for producing highly porous, metal-free, N-doped activated carbon (N-AC) for CO2 capture and herbicide removal from simulated industrially polluted and real environmental systems. N-AC was prepared from kraft lignin—a carbon-rich and abundant byproduct of the pulp industry, using nitric acid as the...

The correlation between lignin structure, its properties, and performance is crucial for lignin engineering in high-value products. Currently, a widespread approach is to compare lignins which differ by more than one parameter (i.e., Kraft vs organosolv vs lignosulfonates) in various applications by attributing the changes in their properties/perfo...

The correlation between lignin structure, its properties and performance is crucial for lignin engineering in high-value products. Currently, the most common approach is to compare different lignins which differ for more than one parameter (i.e. Kraft vs. organosolv vs. lignosulfonates) in various applications by attributing the changes in their pr...

The development of functional materials from food waste sources and minerals is currently of high importance. In the present work, polylactic acid (PLA)/silica composites were prepared by in situ ring-opening polymerizations of L-lactide onto the surface of pristine (Silochrom) and amine-functionalized (Silochrom-NH2) silica. The characteristics of...

Herein, we utilized carbon nanodots (R-CNDs) for the electrochemical detection of estrogens in tap and natural water samples and simulated effluents from Swedish waste water treatment plants (WWTPs). R-CNDs were prepared from 2-aminophenol by solvothermal synthesis and used as a modifier for chitosan-based selective membranes. The data obtained fro...

Herein, we utilized carbon nanodots (R-CNDs) for the electrochemical detection of estrogens in tap, natural water samples and simulated effluents from Swedish Waste Water Treatment Plants (WWTPs). R-CNDs were prepared from 2-aminophenol by solvothermal synthesis and used as a modifier for chitosan-based selective membranes. The data obtained from a...

In the present work, the sol-gel synthesis method was employed as strategy to obtain a magnetic and mesoporous silica-niobia material. The planned synthesis was based on the hetero-condensation of niobium and silicon alkoxide precursors, in the presence of spherical magnetite particles. The resulting material presented interesting characteristics s...

Because of its high surface area and combination of various functional groups, graphene oxide (GO) is currently one of the most actively studied materials for electroanalytical applications. It is not practical to utilize self-supported GO on its own and thus it is commonly integrated with different supporting carriers. Having a large lateral size,...

A new electrochemical sensor based on a carbon nanotube paste electrode modified with a Santa Barbara Amorphous material (SBA‐15) decorated with silver nanoparticles, namely CNT/SBA/Ag‐PE, was developed. It was successfully applied for individual and simultaneous determination of both paracetamol (PC) and sulfamethoxazole (SMZ) medicines. The elect...

Because of high surface area and combination of various functional groups, graphene oxide (GO) is currently one of the most actively studying materials for electroanalytical applications. Self-supported GO is not practical enough to be utilized individually and thus is commonly integrated with different supporting carriers. Having large lateral siz...

Four silica materials was prepared by using different synthesis procedures, with the goal of obtaining matrices with different designed textures, microporous, mesoporous, and ordered pore structured materials, as MCM-41 and SBA-15. These silica materials were used to prepare bare carbon paste electrode, without addition of other components, as nano...

In the present study, an electrochemical sensor based on the electrode (SiMImCl/C) consisting of graphite and silica, grafted with 1-n-propyl-3-methylimidazolium chloride was used for ascorbic acid (AA) quantification in pharmaceuticals and food formulations. Cyclic voltammetry and electrochemical impedance spectroscopy were applied for electrochem...

In the present work, an experimental procedure was developed in order to obtain different amounts of titanium oxide highly dispersed on the surface of mesoporous ordered silica material, SBA-15 type. The procedure is based on successive grafting reactions using small quantities of titanium alkoxide precursor that allow obtaining high amounts of hig...

A mixture of silica chemically modified with 1-n-propyl-3-methylimidazolium chloride and graphite was used to fabricate a ceramic working electrode. The conventional three-electrode cell that included the prepared electrode has been used to investigate the electrochemical behavior of quercetin in aqueous and ethanol-water media by methods of cyclic...

The electrodes based on silica-organic materials with immobilized phosphonic groups and sorbed ions of Cu (II) and Fe (III) were created for dopamine determination. The technique of differential pulse voltametry was used for electrochemical measurements. It was found, that surface complexes of Cu (II) or Fe (III) and phosphonic groups have electroc...

A new silica-organic hybrid material with fixed ionic liquid 1-n-propyl-3-methylimidazolium chloride has been synthesized by the sol-gel method. Its specific surface area is 22 m2 g−1, average pore diameter is 8 nm and pore volume is 0.05 cm3 g−1. According to the results of 13C NMR spectroscopy, the fixed 1-n-propyl-3-methylimidazolium cationic gr...

Adsorption of anionic dyes Eosin Yellow and Reactive Blue 4 by amine containing ormosils has been studied. The probing of the material surfaces with the H+ ions has been used to characterize quantitatively protolytic equilibria of immobilized amines. The Langmuir adsorption model is too simplified and does not provide the correct description of the...

Surface polarity and acidity are important characteristics of silica-organic materials. Functional groups responsible for the surface acidity and affecting polarity are silanols. Another groups may affect these properties too. The report presents the results of probing surfaces of chemically modified silicas and ormosiles by fluorescent and solvato...

Silica with grafted 1-n-propyl-3-methylimidazolium chloride was investigated as adsorbent for the removal of cobalt(II), copper(II), zinc(II), cadmium(II) and mercury(II) chlorides from alcoholic and aqueous solutions. The adsorption proceeds via the formation of metal-chloride anionic complexes detained near the grafted organic cations as counteri...

Silica chemically modified with ionic liquid 1-propyl-3-methylimidazolium chloride has been examined as the material for the removal of anionic dyes Eosin Yellow (EY) and Reactive Blue 4 (RB4) from solutions. The material has the specific surface area 220 m(2)/g and average pore diameter 12.4 nm. Equilibrium and kinetics of the dye binding have bee...

The property of non-ideality (cooperativity effects, energetic heterogeneity of binding centres) is often observed at probing surfaces by small ionic or molecular probes. A procedure based on the model of polydentate binding is recommended as a tool for detection and quantitative characterization of these effects. This procedure allows one to find...

Two samples of ormosils, Material 1 and Material 2, synthesized by sol-gel procedure using cation and anion surfactants, have specific surface areas 17±2 and 176±5 m2g-1 and average pore sizes 3.6 and 3.3nm, correspondingly. The proposed method for surfactants removing was better for Material 1 than for Material 2. The model of bidentate binding ad...

Hybrid silica-organic material with fixed n-propylamine groups was prepared by a sol–gel route and characterized by several techniques. Specific surface area of the material was 110 ± 2 m2 g−1, specific pore volume was 0.90 ± 0.01 cm3 g−1, and average pore size was 25 ± 3 nm. The specific concentration of attached amino groups was 3.28 ± 0.05 mmol...