Evgeny Galunin - Academia.edu (original) (raw)

Papers by Evgeny Galunin

Polymer Engineering and Science, Jan 10, 2022

Journal of advanced materials and technologies, 2021

The article analyzes and provides data on the processes of accumulation of heavy metals by bottom... more The article analyzes and provides data on the processes of accumulation of heavy metals by bottom sediments from the point of view of environmental assessment. The purpose of this paper is to identify the degree of anthropogenic influence on the lakes of the Tazovskiy and Surgut districts, and assess the ecological state of water bodies and adjacent territories. The main processes occurring in natural reservoirs, which lead to the transfer of toxicants into the environment, are considered. The data of quantitative chemical analysis of bottom sediments of two groups of natural reservoirs with an assessment of their ecological state according to the results of statistical processing of the measured values were obtained. Excess concentrations of metals were recorded: for mobile forms-2200 times for Fe, 1050 times for Mn, 35 times for Cr, 20 times for Co, up to 15 times for Ni, 5 times for Cu, 3 times for Pb, for acid-soluble forms-45 000 times for Fe, 550 times for Pb, up to 75 times for Ni, 525 times for Mn, 105 times for Cr, 50 times for Cu, 16 times for Co. The geochemical interpretation of the results of the factor analysis is presented.

Environmental Technology and Innovation, Aug 1, 2018

Comparison of multiple linear regression and group method of data handling models for predicting ... more Comparison of multiple linear regression and group method of data handling models for predicting sunset yellow dye removal onto activated carbon from oak tree wood.

Proceedings of the 2nd World Congress on Recent Advances in Nanotechnology, Apr 1, 2019

Nucleation and Atmospheric Aerosols, 2018

Nucleation and Atmospheric Aerosols, 2016

Correlation of electrical conductivity, dielectric properties, microwave absorption, and matrix p... more Correlation of electrical conductivity, dielectric properties, microwave absorption, and matrix properties of composites filled with graphene nanoplatelets and carbon nanotubes

International Journal of Environmental Science and Technology, Jul 19, 2021

The facile synthesis of the advanced cobalt-based materials [1.0Co/Al2O3 (A), 0.5Co/Al2O3 (B), 3.... more The facile synthesis of the advanced cobalt-based materials [1.0Co/Al2O3 (A), 0.5Co/Al2O3 (B), 3.5CoNaY (C) and 0.4CoHY (D)] is reported. The characterization of the materials was carried out by X-ray photoelectronic, energy-dispersive X-ray, atomic absorption and low-temperature nitrogen adsorption methods. These materials were used for a comparative degradative and adsorptive removal of carmoisine azo dye in water. The adsorptive and degradative removals were 62.0–96.1% and 68.1–96.1% for all four materials. The degradation was occurred by hydroxyl radicals and peroxy free radicals. The adsorptive removal followed Langmuir, Temin and Dubinin–Radushkevich models. The adsorption obeyed pseudo-first-order kinetics and liquid film diffusion mechanism. The results indicated that both degradative and adsorptive phenomena had comparative removal capacities. The removal capacities of all four materials were C > A > D > B. The maximum removal was obtained by material C (96.1%) and A (90.0%) in a wide pH range of 3.0–9.0. The reported methods are very effective, efficient and inexpensive for the removal of carmoisine azo dye in water. These methods may be used to remove the reported dye at a large scale in any water resource.

Polymer Bulletin, Jan 23, 2021

Composites Science and Technology, Sep 1, 2021

Abstract A highly electrical conductive multi-walled carbon nanotubes based polymer composite is ... more Abstract A highly electrical conductive multi-walled carbon nanotubes based polymer composite is fabricated by iodine doping. Selective localization of carbon nanotubes in polymethyl methacrylate was obtained by intensive dry mixing of polymer and nanotubes powders followed by hot pressing. The electrical conductivity of the materials was significantly increased (10–100%) when the composites were treated with iodine by the gas phase. The electrical conductivity of the materials was significantly increased because of MWCNTs addition from the value not higher than about 10−15 to about 10−2 S/cm. The addition of iodine leads to an additional increase in electrical conductivity by 10–100%, depending on the content of MWCNTs. It is interesting to note that a more effective increase in electrical conductivity is observed at low MWCNTs concentrations. An interesting result of the work is the presentation of the fact that iodine is uniformly absorbed in the bulk of the composite filled with nanotubes; in the case of an unfilled polymer, iodine is deposited only on the sample surface. The percolation nature of the conductivity of the investigated composites was found and the percolation threshold was calculated. It was shown that the percolation threshold does not significantly change after iodination. Thus, in this work, we have shown the possibility of simple technology for producing composites with a spatial localized distribution of carbon nanotubes, providing high conductivity (2.86 × 10−2 S/cm) and a low percolation threshold (about 0.37% vol.) at the MWCNTs content of 1.55% vol.

Science of The Total Environment, Sep 1, 2022

Talanta, Jun 1, 2021

A hapten-protein conjugate with copper nanoparticles (Hap-Car-BSA@CuNPs) was first synthesized in... more A hapten-protein conjugate with copper nanoparticles (Hap-Car-BSA@CuNPs) was first synthesized in the present work for the determination of carbaryl. The copper nanoparticles (CuNPs) of the conjugate were used as electrochemical labels in the direct solid-phase competitive determination of carbaryl residues in flour from different crops. The signal was read by linear sweep anodic stripping voltammetry (LSASV) of copper (through the electrochemical stripping of accumulated elemental copper) on a gold-graphite electrode (GGE). To form a recognition receptor layer of monoclonal antibodies against the carbaryl on the surface of the GGE, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (EDC) and 1-hydroxy-2,5-pyrrolidinedione (NHS) were used as the best covalent cross-linkers. The concentrations of the antibodies and the Hap-Car-BSA@CuNPs conjugate were optimized for carbaryl detection by the electrochemical immunosensor. The electrochemical immunosensor can be used for highly sensitive determination of carbaryl residues in flour samples in the concentration range 0.8-32.3 μg·kg-1, with a limit of detection 0.08 μg·kg-1. The present work paves the path for a novel method for monitoring carbaryl in other food products, drinks, and soil samples.

Reactive & Functional Polymers, Sep 1, 2014

A novel hierarchically imprinted cross-linked poly(acrylamide-co-ethylene glycol dimethacrylate) ... more A novel hierarchically imprinted cross-linked poly(acrylamide-co-ethylene glycol dimethacrylate) using a double-imprinting approach for the Cu 2+ selective separation from aqueous medium was prepared. In the imprinting process, both Cu 2+ ions and surfactant micelles (cetyltrimethylammonium bromide-CTAB) were employed as templates. The hierarchically imprinted organic polymer named (IIP-CTAB), singleimprinted (IIP-no CTAB) and non-imprinted (NIP-CTAB and NIP-no CTAB) polymers were characterized by SEM, FTIR, TG, elemental analysis and textural data from BET (Brunauer-Emmett-Teller) and BJH (Barrett-Joyner-Halenda). Compared to these materials, IIP-CTAB showed higher selectivity, specific surface area and adsorption capacity toward Cu 2+ ions. Good selectivity for Cu 2+ was obtained for the Cu 2+ /Cd 2+ , Cu 2+ /Zn 2+ and Cu 2+ /Co 2+ systems when IIP-CTAB was compared to the single-imprinted (IIP-no CTAB) and non double-imprinted polymer (NIP-CTAB), thereby confirming the improvement in the polymer selectivity due to double-imprinting effect. For adsorption kinetic data, the best fit was provided with the pseudo-second-order model for the four materials, thereby indicating the chemical nature of the Cu 2+ adsorption process. Cu 2+ adsorption under equilibrium was found to follow dual-site Langmuir-Freundlich model isotherm, thus suggesting the existence of adsorption sites with low and high binding energy on the adsorbent surface. From column experiments 600 adsorption-desorption cycles using 1.8 mol L À1 HNO 3 as eluent confirmed the great recoverability of adsorbent. The synthesis approach here investigated has been found to be very attractive for the designing of organic ion imprinted polymer and can be expanded to the other polymers to improve performance of ion imprinted polymers in the field of solid phase extraction.

Nucleation and Atmospheric Aerosols, 2018

Nucleation and Atmospheric Aerosols, 2017

The process of carboxylated carbon nanotubes (CNT) modification with polyaniline (PANI) has been ... more The process of carboxylated carbon nanotubes (CNT) modification with polyaniline (PANI) has been studied by molecular dynamics methods. It is shown that the formation of dimers and phenazine oligomeric products takes place on the surface of CNT, after which desorption takes place, and the growth of macromolecular PANI chains occurs in the reaction mass bulk. Carboxylate groups have an orienting effect on the arrangement of PANI molecules in the formation of the modifying layer, therefore, the properties of synthesized composites are affected not only by the presence of functional groups on the CNT surface, but also by the degree of functionalization. An approach is proposed to determine the degree of preliminary functionalization of CNT by carboxylate groups, which ensures the formation of the uniform PANI coating and the highest electrical capacity and conductivity of the composites.

IOP conference series, Nov 1, 2019

The present paper considers the efficiency of using carbon nanotubes (CNTs) functionalized by tit... more The present paper considers the efficiency of using carbon nanotubes (CNTs) functionalized by titanium stearate groups for modifying of polyethylene and polypropylene. For this purpose, the strength characteristics, Shore hardness, thermal diffusivity and conductivity of the obtained nanocomposites were determined. The weak effect of the CNTs (0.01-1.5 wt.%) on the values of thermal conductivity coefficients and thermal diffusivity was revealed. It was found that compared to the unmodified matrix, nanocomposites containing 0.01-0.1 wt.% of the titanium stearatefunctionalized CNTs demonstrate, an increase in the Shore hardness by 12.5-14.5%, a decrease in the weight wear by 54.2%, and the daily water absorption-to the values below the threshold of sensitivity of the standardized method of determination. The functionalization by the titanium stearate groups made it possible to reduce the CNTs mass fraction in the composition of polyethylene and polypropylene composites by more than 10 times compared with the pristine nanotubes.

Nucleation and Atmospheric Aerosols, 2018

The prospects for using a phenol-formaldehyde resin (PFR) as a reactive surfactant in the prepara... more The prospects for using a phenol-formaldehyde resin (PFR) as a reactive surfactant in the preparation of highly concentrated dispersions of carbon nanostructured materials (up to 1 %) are considered in the present paper. Modifying graphene nanoplatelets (GNPs) with this surfactant promotes the effect of targeted self-assembly of carbon nanoparticles in solution (with decreasing pH), which makes it possible to obtain nanocomposites with improved properties. It is important that the use of highly concentrated dispersions of PFR-modified GNPs in the production of nanocomposite materials does not require a preliminary removal of the surfactant. Based on the resulting dispersion, the mesoporous carbon/GNPs composite with a developed surface (3000 − 4000 m 2 g −1) was successfully synthesized. It can be used as an electrode material for supercapacitors and an adsorbent of organic and inorganic species for wastewater treatment purposes.

Fullerenes Nanotubes and Carbon Nanostructures, Feb 12, 2020

This article discusses the nature of the distribution of intact polyaniline-functionalized graphe... more This article discusses the nature of the distribution of intact polyaniline-functionalized graphene nanoplatelets (GNPs) in the surface layer of nanomodified films of ultra-high molecular weight polyethylene (UHMWPE) using a Raman mapping method. On the Raman maps, D, G, and 2D peaks can be observed for the 0.1 wt.% GNPs content in the UHMWPE. In the surface layer of the films containing 1.0 wt.% GNPs, these signals are not detected, thereby indicating the displacement of the nanomodifier into the polymer bulk. In contrast, the polyaniline-functionalized GNPs tend to migrate to the surface of the UHMWPE nanocomposite film and evenly distribute in the surface layer as the concentration increases from 0.1 to 2.0 wt.%.

Journal of Molecular Liquids, Mar 1, 2018

Carbon nanotubes (CNTs) are gaining increased importance in many fields of science and technology... more Carbon nanotubes (CNTs) are gaining increased importance in many fields of science and technology due to their unique properties of greater surface area, mechanical strength, electrical and thermal conductivity. A novel method of carbon nanotubes synthesis on a nickel magnesium oxide catalyst using microwave radiation was developed and presented. In the present paper, the possibility of modifying a Ni-MgO catalyst, for carbon nanotube synthesis with microwave radiation (0.8 kW and 2.45 GHz) at the production stage, is studied. The effect of this radiation on the catalyst characteristics (specific surface area, catalytic activity, etc.) is experimentally considered. It is shown that the use of short term exposure to the microwave radiation in preparing the catalyst made it possible to increase its specific surface area from 5.2 to 9.1 m 2 /g. The implementation of chemical vapor deposition of the catalyst, modified with the microwave radiation for 30 seconds, contributed to an increase in the yield of a nanostructured material by 40-45%; making carbon nanotubes inexpensive in production. The synthesized carbon nanostructured material predominantly represented multilayered nanotubes with a diameter of 10-40 nm. The developed method was capable to produce 40-45% yield with almost two time's greater surface area. The synthesized carbon nanotubes may be used for various purposes including water treatment due to the economy in production and large surface area.

Applied Clay Science, Sep 1, 2012

The sorption of La and Lu mixtures was examined in two bentonites after incubation for three mont... more The sorption of La and Lu mixtures was examined in two bentonites after incubation for three months at 20 and 80 o C with Fe(0), as a laboratory approach to evaluate the effects of waste canister corrosion in a deep repository on the performance of clay engineered barriers. The sorption/desorption parameters were determined from batch tests in two ionic media: deionized water and, to consider the additional effect of cement leachates, 0.02 mol L −1 Ca. Results from XRD analyses showed the formation of crystalline FeO(OH), goethite, in a few samples and the degradation of the bentonites due to Fe(0) oxidation during incubation. Moreover, the EDX spectra showed that the lanthanides were sorbed primarily at smectite sites, although sorption onto goethite was also observed, whereas Fe(0) particles did not contribute to lanthanide sorption. The formation of goethite could explain the high K d values measured in a few scenarios (e.g., those with single solutions or mixtures with the lowest initial concentration of the competitive lanthanide in which high affinity sites governed sorption), with up to 3-fold increases over the values obtained without Fe incubation. However, at higher lanthanide concentration, K d values decreased or remained constant compared to the samples without Fe incubation, which could be explained by bentonite degradation. In the Ca medium, as much as 5 times lower K d values were obtained, because of the competitive effect of the Ca ions, especially for Lu in the MX80 bentonite. This indicated that the small number of high affinity sites had been diminished. The sorption data were satisfactorily fitted to a two-solute Langmuir model. In addition, K d values correlated well with desorption data, which showed that the larger the decrease in K d , the larger the increase in sorption reversibility. It is suggested that corrosion products from the metal canister might compromise the long-term radionuclide retention of the clay-engineered barriers.

Journal of Hazardous Materials, 2014

h i g h l i g h t s • The cadmium sorption-desorption behavior on environmental samples was inves... more h i g h l i g h t s • The cadmium sorption-desorption behavior on environmental samples was investigated. • The sorption decreased due to competition between Cd and protons in aqueous medium. • The experimental data were successfully adjusted to the Langmuir-Freundlich model. • The role of low-energy non-specific sites on the sample surfaces was elucidated. • The desorption rate and hysteresis index suggested a high risk of cadmium pollution.

Polymer Engineering and Science, Jan 10, 2022

Journal of advanced materials and technologies, 2021

The article analyzes and provides data on the processes of accumulation of heavy metals by bottom... more The article analyzes and provides data on the processes of accumulation of heavy metals by bottom sediments from the point of view of environmental assessment. The purpose of this paper is to identify the degree of anthropogenic influence on the lakes of the Tazovskiy and Surgut districts, and assess the ecological state of water bodies and adjacent territories. The main processes occurring in natural reservoirs, which lead to the transfer of toxicants into the environment, are considered. The data of quantitative chemical analysis of bottom sediments of two groups of natural reservoirs with an assessment of their ecological state according to the results of statistical processing of the measured values were obtained. Excess concentrations of metals were recorded: for mobile forms-2200 times for Fe, 1050 times for Mn, 35 times for Cr, 20 times for Co, up to 15 times for Ni, 5 times for Cu, 3 times for Pb, for acid-soluble forms-45 000 times for Fe, 550 times for Pb, up to 75 times for Ni, 525 times for Mn, 105 times for Cr, 50 times for Cu, 16 times for Co. The geochemical interpretation of the results of the factor analysis is presented.

Environmental Technology and Innovation, Aug 1, 2018

Comparison of multiple linear regression and group method of data handling models for predicting ... more Comparison of multiple linear regression and group method of data handling models for predicting sunset yellow dye removal onto activated carbon from oak tree wood.

Proceedings of the 2nd World Congress on Recent Advances in Nanotechnology, Apr 1, 2019

Nucleation and Atmospheric Aerosols, 2018

Nucleation and Atmospheric Aerosols, 2016

Correlation of electrical conductivity, dielectric properties, microwave absorption, and matrix p... more Correlation of electrical conductivity, dielectric properties, microwave absorption, and matrix properties of composites filled with graphene nanoplatelets and carbon nanotubes

International Journal of Environmental Science and Technology, Jul 19, 2021

The facile synthesis of the advanced cobalt-based materials [1.0Co/Al2O3 (A), 0.5Co/Al2O3 (B), 3.... more The facile synthesis of the advanced cobalt-based materials [1.0Co/Al2O3 (A), 0.5Co/Al2O3 (B), 3.5CoNaY (C) and 0.4CoHY (D)] is reported. The characterization of the materials was carried out by X-ray photoelectronic, energy-dispersive X-ray, atomic absorption and low-temperature nitrogen adsorption methods. These materials were used for a comparative degradative and adsorptive removal of carmoisine azo dye in water. The adsorptive and degradative removals were 62.0–96.1% and 68.1–96.1% for all four materials. The degradation was occurred by hydroxyl radicals and peroxy free radicals. The adsorptive removal followed Langmuir, Temin and Dubinin–Radushkevich models. The adsorption obeyed pseudo-first-order kinetics and liquid film diffusion mechanism. The results indicated that both degradative and adsorptive phenomena had comparative removal capacities. The removal capacities of all four materials were C > A > D > B. The maximum removal was obtained by material C (96.1%) and A (90.0%) in a wide pH range of 3.0–9.0. The reported methods are very effective, efficient and inexpensive for the removal of carmoisine azo dye in water. These methods may be used to remove the reported dye at a large scale in any water resource.

Polymer Bulletin, Jan 23, 2021

Composites Science and Technology, Sep 1, 2021

Abstract A highly electrical conductive multi-walled carbon nanotubes based polymer composite is ... more Abstract A highly electrical conductive multi-walled carbon nanotubes based polymer composite is fabricated by iodine doping. Selective localization of carbon nanotubes in polymethyl methacrylate was obtained by intensive dry mixing of polymer and nanotubes powders followed by hot pressing. The electrical conductivity of the materials was significantly increased (10–100%) when the composites were treated with iodine by the gas phase. The electrical conductivity of the materials was significantly increased because of MWCNTs addition from the value not higher than about 10−15 to about 10−2 S/cm. The addition of iodine leads to an additional increase in electrical conductivity by 10–100%, depending on the content of MWCNTs. It is interesting to note that a more effective increase in electrical conductivity is observed at low MWCNTs concentrations. An interesting result of the work is the presentation of the fact that iodine is uniformly absorbed in the bulk of the composite filled with nanotubes; in the case of an unfilled polymer, iodine is deposited only on the sample surface. The percolation nature of the conductivity of the investigated composites was found and the percolation threshold was calculated. It was shown that the percolation threshold does not significantly change after iodination. Thus, in this work, we have shown the possibility of simple technology for producing composites with a spatial localized distribution of carbon nanotubes, providing high conductivity (2.86 × 10−2 S/cm) and a low percolation threshold (about 0.37% vol.) at the MWCNTs content of 1.55% vol.

Science of The Total Environment, Sep 1, 2022

Talanta, Jun 1, 2021

A hapten-protein conjugate with copper nanoparticles (Hap-Car-BSA@CuNPs) was first synthesized in... more A hapten-protein conjugate with copper nanoparticles (Hap-Car-BSA@CuNPs) was first synthesized in the present work for the determination of carbaryl. The copper nanoparticles (CuNPs) of the conjugate were used as electrochemical labels in the direct solid-phase competitive determination of carbaryl residues in flour from different crops. The signal was read by linear sweep anodic stripping voltammetry (LSASV) of copper (through the electrochemical stripping of accumulated elemental copper) on a gold-graphite electrode (GGE). To form a recognition receptor layer of monoclonal antibodies against the carbaryl on the surface of the GGE, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (EDC) and 1-hydroxy-2,5-pyrrolidinedione (NHS) were used as the best covalent cross-linkers. The concentrations of the antibodies and the Hap-Car-BSA@CuNPs conjugate were optimized for carbaryl detection by the electrochemical immunosensor. The electrochemical immunosensor can be used for highly sensitive determination of carbaryl residues in flour samples in the concentration range 0.8-32.3 μg·kg-1, with a limit of detection 0.08 μg·kg-1. The present work paves the path for a novel method for monitoring carbaryl in other food products, drinks, and soil samples.

Reactive & Functional Polymers, Sep 1, 2014

A novel hierarchically imprinted cross-linked poly(acrylamide-co-ethylene glycol dimethacrylate) ... more A novel hierarchically imprinted cross-linked poly(acrylamide-co-ethylene glycol dimethacrylate) using a double-imprinting approach for the Cu 2+ selective separation from aqueous medium was prepared. In the imprinting process, both Cu 2+ ions and surfactant micelles (cetyltrimethylammonium bromide-CTAB) were employed as templates. The hierarchically imprinted organic polymer named (IIP-CTAB), singleimprinted (IIP-no CTAB) and non-imprinted (NIP-CTAB and NIP-no CTAB) polymers were characterized by SEM, FTIR, TG, elemental analysis and textural data from BET (Brunauer-Emmett-Teller) and BJH (Barrett-Joyner-Halenda). Compared to these materials, IIP-CTAB showed higher selectivity, specific surface area and adsorption capacity toward Cu 2+ ions. Good selectivity for Cu 2+ was obtained for the Cu 2+ /Cd 2+ , Cu 2+ /Zn 2+ and Cu 2+ /Co 2+ systems when IIP-CTAB was compared to the single-imprinted (IIP-no CTAB) and non double-imprinted polymer (NIP-CTAB), thereby confirming the improvement in the polymer selectivity due to double-imprinting effect. For adsorption kinetic data, the best fit was provided with the pseudo-second-order model for the four materials, thereby indicating the chemical nature of the Cu 2+ adsorption process. Cu 2+ adsorption under equilibrium was found to follow dual-site Langmuir-Freundlich model isotherm, thus suggesting the existence of adsorption sites with low and high binding energy on the adsorbent surface. From column experiments 600 adsorption-desorption cycles using 1.8 mol L À1 HNO 3 as eluent confirmed the great recoverability of adsorbent. The synthesis approach here investigated has been found to be very attractive for the designing of organic ion imprinted polymer and can be expanded to the other polymers to improve performance of ion imprinted polymers in the field of solid phase extraction.

Nucleation and Atmospheric Aerosols, 2018

Nucleation and Atmospheric Aerosols, 2017

The process of carboxylated carbon nanotubes (CNT) modification with polyaniline (PANI) has been ... more The process of carboxylated carbon nanotubes (CNT) modification with polyaniline (PANI) has been studied by molecular dynamics methods. It is shown that the formation of dimers and phenazine oligomeric products takes place on the surface of CNT, after which desorption takes place, and the growth of macromolecular PANI chains occurs in the reaction mass bulk. Carboxylate groups have an orienting effect on the arrangement of PANI molecules in the formation of the modifying layer, therefore, the properties of synthesized composites are affected not only by the presence of functional groups on the CNT surface, but also by the degree of functionalization. An approach is proposed to determine the degree of preliminary functionalization of CNT by carboxylate groups, which ensures the formation of the uniform PANI coating and the highest electrical capacity and conductivity of the composites.

IOP conference series, Nov 1, 2019

The present paper considers the efficiency of using carbon nanotubes (CNTs) functionalized by tit... more The present paper considers the efficiency of using carbon nanotubes (CNTs) functionalized by titanium stearate groups for modifying of polyethylene and polypropylene. For this purpose, the strength characteristics, Shore hardness, thermal diffusivity and conductivity of the obtained nanocomposites were determined. The weak effect of the CNTs (0.01-1.5 wt.%) on the values of thermal conductivity coefficients and thermal diffusivity was revealed. It was found that compared to the unmodified matrix, nanocomposites containing 0.01-0.1 wt.% of the titanium stearatefunctionalized CNTs demonstrate, an increase in the Shore hardness by 12.5-14.5%, a decrease in the weight wear by 54.2%, and the daily water absorption-to the values below the threshold of sensitivity of the standardized method of determination. The functionalization by the titanium stearate groups made it possible to reduce the CNTs mass fraction in the composition of polyethylene and polypropylene composites by more than 10 times compared with the pristine nanotubes.

Nucleation and Atmospheric Aerosols, 2018

The prospects for using a phenol-formaldehyde resin (PFR) as a reactive surfactant in the prepara... more The prospects for using a phenol-formaldehyde resin (PFR) as a reactive surfactant in the preparation of highly concentrated dispersions of carbon nanostructured materials (up to 1 %) are considered in the present paper. Modifying graphene nanoplatelets (GNPs) with this surfactant promotes the effect of targeted self-assembly of carbon nanoparticles in solution (with decreasing pH), which makes it possible to obtain nanocomposites with improved properties. It is important that the use of highly concentrated dispersions of PFR-modified GNPs in the production of nanocomposite materials does not require a preliminary removal of the surfactant. Based on the resulting dispersion, the mesoporous carbon/GNPs composite with a developed surface (3000 − 4000 m 2 g −1) was successfully synthesized. It can be used as an electrode material for supercapacitors and an adsorbent of organic and inorganic species for wastewater treatment purposes.

Fullerenes Nanotubes and Carbon Nanostructures, Feb 12, 2020

This article discusses the nature of the distribution of intact polyaniline-functionalized graphe... more This article discusses the nature of the distribution of intact polyaniline-functionalized graphene nanoplatelets (GNPs) in the surface layer of nanomodified films of ultra-high molecular weight polyethylene (UHMWPE) using a Raman mapping method. On the Raman maps, D, G, and 2D peaks can be observed for the 0.1 wt.% GNPs content in the UHMWPE. In the surface layer of the films containing 1.0 wt.% GNPs, these signals are not detected, thereby indicating the displacement of the nanomodifier into the polymer bulk. In contrast, the polyaniline-functionalized GNPs tend to migrate to the surface of the UHMWPE nanocomposite film and evenly distribute in the surface layer as the concentration increases from 0.1 to 2.0 wt.%.

Journal of Molecular Liquids, Mar 1, 2018

Carbon nanotubes (CNTs) are gaining increased importance in many fields of science and technology... more Carbon nanotubes (CNTs) are gaining increased importance in many fields of science and technology due to their unique properties of greater surface area, mechanical strength, electrical and thermal conductivity. A novel method of carbon nanotubes synthesis on a nickel magnesium oxide catalyst using microwave radiation was developed and presented. In the present paper, the possibility of modifying a Ni-MgO catalyst, for carbon nanotube synthesis with microwave radiation (0.8 kW and 2.45 GHz) at the production stage, is studied. The effect of this radiation on the catalyst characteristics (specific surface area, catalytic activity, etc.) is experimentally considered. It is shown that the use of short term exposure to the microwave radiation in preparing the catalyst made it possible to increase its specific surface area from 5.2 to 9.1 m 2 /g. The implementation of chemical vapor deposition of the catalyst, modified with the microwave radiation for 30 seconds, contributed to an increase in the yield of a nanostructured material by 40-45%; making carbon nanotubes inexpensive in production. The synthesized carbon nanostructured material predominantly represented multilayered nanotubes with a diameter of 10-40 nm. The developed method was capable to produce 40-45% yield with almost two time's greater surface area. The synthesized carbon nanotubes may be used for various purposes including water treatment due to the economy in production and large surface area.

Applied Clay Science, Sep 1, 2012

The sorption of La and Lu mixtures was examined in two bentonites after incubation for three mont... more The sorption of La and Lu mixtures was examined in two bentonites after incubation for three months at 20 and 80 o C with Fe(0), as a laboratory approach to evaluate the effects of waste canister corrosion in a deep repository on the performance of clay engineered barriers. The sorption/desorption parameters were determined from batch tests in two ionic media: deionized water and, to consider the additional effect of cement leachates, 0.02 mol L −1 Ca. Results from XRD analyses showed the formation of crystalline FeO(OH), goethite, in a few samples and the degradation of the bentonites due to Fe(0) oxidation during incubation. Moreover, the EDX spectra showed that the lanthanides were sorbed primarily at smectite sites, although sorption onto goethite was also observed, whereas Fe(0) particles did not contribute to lanthanide sorption. The formation of goethite could explain the high K d values measured in a few scenarios (e.g., those with single solutions or mixtures with the lowest initial concentration of the competitive lanthanide in which high affinity sites governed sorption), with up to 3-fold increases over the values obtained without Fe incubation. However, at higher lanthanide concentration, K d values decreased or remained constant compared to the samples without Fe incubation, which could be explained by bentonite degradation. In the Ca medium, as much as 5 times lower K d values were obtained, because of the competitive effect of the Ca ions, especially for Lu in the MX80 bentonite. This indicated that the small number of high affinity sites had been diminished. The sorption data were satisfactorily fitted to a two-solute Langmuir model. In addition, K d values correlated well with desorption data, which showed that the larger the decrease in K d , the larger the increase in sorption reversibility. It is suggested that corrosion products from the metal canister might compromise the long-term radionuclide retention of the clay-engineered barriers.

Journal of Hazardous Materials, 2014

h i g h l i g h t s • The cadmium sorption-desorption behavior on environmental samples was inves... more h i g h l i g h t s • The cadmium sorption-desorption behavior on environmental samples was investigated. • The sorption decreased due to competition between Cd and protons in aqueous medium. • The experimental data were successfully adjusted to the Langmuir-Freundlich model. • The role of low-energy non-specific sites on the sample surfaces was elucidated. • The desorption rate and hysteresis index suggested a high risk of cadmium pollution.