The purpose of this study was to study the material of a bronze sleeve obtained by 3D printing from metal polymer wire.
Methods. For printing and research, the Bronze Fill filament from the manufacturer Color Fabb was used, which includes 80% bronze and 20% polylactide. To create a model of the CAT-434 excavator bushing, taking into account the properties of the Bronze Fill filament, the Autodesk Inventor program was used. The model was printed on an Anycubic Mega S 3D printer. The chemical composition of the samples was determined using a Niton Xl3t GOLDD spectrometer. The microstructure of the material was studied using an Olympus GX53 microscope at various magnifications. The surface roughness of the part was studied using a Time Group TR300 profilometer.
Results. Based on the conducted research, it was found that the sleeve made by 3D printing is able to withstand the mass of the semi-axis with a high margin of safety. Bronze obtained in this way can perform an antifriction function when working in friction conditions. It is possible to reduce the cost of the starting material for products made by 3D printing by layer-by-layer surfacing of metal-plastic wire by using powder obtained from industrial waste as a filler. This allows the use of environmentally friendly materials and reduces the negative impact on the environment.
Conclusion. The use of 3D printing for the manufacture of metal products has great potential for industry and scientific research. This allows you to create high-quality, durable and precise products with reduced production costs. Using the 3D printing method for the manufacture of metal products, such as bushings, allows you to obtain products with high accuracy and quality. The bronze obtained by 3D printing has a similar chemical composition and high strength, which makes it suitable for use in mechanical engineering.

The purpose of the study – is to determine the effect of modifying and organic additives on the structure and properties of G13 powder steel.
Methods. The study of the microstructure and mechanical properties of G13 sludge with modifying and organic additives was carried out. As modifying additives were used: nano-aluminum oxide powder and nano-zirconium oxide powder. The following organic additives were used: ethylene-bis-stearomide, nickel stearate, copper stearate, manganese stearate, iron stearate. The microstructure was studied using an S-3400N electron microscope. Hardness was determined by the depth of the indentation by the Rockwell method. A hardened steel ball with a diameter of 1.56 mm was taken as an indenter. Bending tests were carried out on an MFL HUS-2010z electro-hydraulic tensile testing machine in automatic mode using an IBM PX personal computer.
Results. When studying the microstructure of steel G13, it was found that the most fine-grained austenite structure is observed in steel with the following composition of the initial charge: Fe + 14.5% FeMn + 1.2% C + ZrO2 (nano). A uniform structure of austenite with small rounded pores is observed in steel G13, which has the following compositions of the initial charge: Fe + 13% FeMn + 1.3% C + 1% St.Cu; Fe + 14.5%FeMn + 1.2%C + 0.5% St.Mn (warm mix). The study of mechanical characteristics has shown that the best combination of hardness after sintering and bending strength is possessed by workpieces made from a powder mixture of composition Fe + 14.5% FeMn + 1.2% C + 0.5% St. Ni.
Conclusion. The most positive effect on the structure of G13 powder steel was exerted by the modifying additive of nano-zirconium oxide powder, as well as organic additives of copper stearate and manganese stearate. The best combination of mechanical characteristics (hardness and bending strength) is exhibited by billets into which an organic additive of nickel stearate was introduced.

Purpose of research. Study of the structure and properties of powders obtained by electroerosion of the LS58-3 alloy in a carbon-containing medium - isopropyl alcohol.
Methods. The process of electrical erosion of LS58-3 alloy waste was carried out on a patented installation, LS58-3 alloy waste was used as metal waste. Isopropyl alcohol, which is a carbon-containing medium, was chosen as the working fluid.
Studies of the morphology and granulometric composition of the obtained particles were carried out on an electron-ion scanning microscope "Quanta 600 FEG" and a laser particle size analyzer Analysette 22 NanoTec", respectively.
X-ray spectral microanalysis of powders was carried out on an energy-dispersive X-ray analyzer from EDAX (Netherlands) built into a scanning electron microscope QUANTA 200 3D (Netherlands). The phase analysis of the powders was performed on a Rigaku Ultima IV X-ray diffractometer (Japan).
Results. An analysis of the morphology of the obtained powders showed that the particles are mainly spherical and elliptical in shape, as well as agglomerates.
Analysis of the particle size distribution of the powder obtained using the Analysette 22 NanoTec particle size analyzer showed that the average particle size is 24 µm. This particle size was obtained in the operating mode of the installation, in which the electroerosion process proceeds stably.
Analysis of the elemental composition has established that free carbon is contained on the surface of the powder particles. The remaining chemical elements Cu, Zn, Pb, Sn are distributed relatively evenly. The presence of free carbon is due to the chemical composition of the dispersion medium, which is carbon-containing.
X-ray diffraction analysis of the obtained powders showed the presence of Cu₃Zn, Pb, ZnO, CuO₂, SnO₂ phases. There are no carbide-forming elements in the composition of the alloy.
It has been experimentally established that the composition, structure and properties of the charge of LS58-3 brass dispersed by electroerosion are affected by the chemical composition of the working fluid, as well as the dispersion modes.
Conclusion. On the basis of the conducted experimental studies, it can be concluded that the use of electroerosive dispersion technology for the processing of LS58-3 brass waste and the production of powders based on it is relevant. It is noted that the particles of the resulting charge have a given set of properties and can be used by various methods of powder metallurgy.

Purpose. Establishment of the elemental and quantitative composition of alloys - components of road milling cutters, which are used as working bodies for milling the road surface, by X-ray fluorescence analysis.
Methods. To establish the chemical composition of alloys - components of cutters of a road milling cutter, WIRTGENW6/20X cutters and their domestic counterpart KZTS A6/20 were studied. The X-ray fluorescence method was chosen to study the elemental composition of the components of the road milling cutters. This method, based on the interaction of X-ray radiation with the analyzed substance, is the most effective and efficient method of analysis, which allows obtaining complete and reliable information about the elemental composition of complex samples in a minimum period of time without destroying them, while maintaining all the physicochemical properties, as well as without using a reference sample. The method is based on the correlation between the X-ray fluorescence intensity and the element concentration in the sample. As a result of irradiating the sample with an X-ray flux, a characteristic emission of atoms is created, which is proportional to their concentration in the sample. With the help of an express analyzer of metals and alloys - the Niton GOLDD spectrometer, experimental data were obtained on the composition of alloys - components of cutters of a road milling machine.
Results. During the study, it was revealed that the components of the cutters are made from the following alloys:
1. Cutter WIRTGEN W6/20X:
- tip made of hard sintered alloy VK8;
- housing made of structural alloyed steel 32G2;
- spring sleeve of the cutter made of structural carbon steel 08ps;
- washer made of structural quality carbon steel 60.
2. Cutter KZTS A6/20:
- tip made of hard sintered alloy VK8;
- housing made of structural alloyed steel 38XV;
- spring sleeve made of structural quality carbon steel 40;
- washer made of structural alloyed steel 45G.
Conclusion. The obtained research results can be used for subsequent processes of hardening or restoration of cutters of road milling machines.

Purpose. Establish the possibility of using the method of plasma spraying of coatings from carbide steels on the steel base in order to increase wear resistance, to identify modes of spraying and to investigate the properties of the resulting coatings.
Methods. Carbide steel has been obtained by mixing the components of steel and titanium carbide in a hard-alloy ball mill in alcohol (0.25 l per 1 kg of mixture) for 48 hours with a ball and mixture ratio of 3 to 1. The mixing mode was established during the previous work at the department. After mixing, it was dried at 80-100 °C in the drying chamber.
The granulometric composition was determined on the FRITSCH ANALYSETTE 22 MicroTec plus universal laser device, equipped with a liquid dispersion unit. Fluidity measured according to GOST 20899-98. Bulk density was measured according to GOST 19440-94.
Results. The analysis and classification of methods of surface treatment of parts and tools of various purposes was carried out, the most common and promising methods for restoration of products were identified, which include methods of spray coating, vacuum metallization and electrophoretic deposition. The process of plasma spraying of coatings from carbide steels on the basis of carbon steel 45 was studied. The possibility of using the method of plasma spraying of coatings from different types of carbide steels on the steel base in order to increase wear resistance was established. The method of preparation of powder mixture by melting in the hydrogen atmosphere which ensures sufficient fluidity
of carbide steels during the formation of coatings was studied. Optimal modes of coatings were established.
Conclusion. The conducted analysis and classification of methods of surface treatment of parts revealed the most common and promising methods, among which the process of plasma spraying of coatings was noted. Experimental studies have shown not only the possibility of practical application, but also a positive result. The high strength of adhesion of coatings with the base metal after vacuum sintering (For 10% TiC carbide steels and base of Cr6W3Mo steel - 116 MPa, for the 40% TiC carbide steels and base of Cr12Mo steel - 220 MPa) has been established.

Purpose of research. Optimization of the technological process of dispersing brass waste in a carbon-containing environment by setting up a full factorial experiment.
Methods. The electroerosion process of LS58-3 alloy waste was carried out on a patented device, LS58-3 alloy waste (GOST 15527-2004) was used as metal waste. Isopropyl alcohol (GOST 9805-84), which is a carbon-containing medium, was chosen as the working fluid (dispersing medium).
Variable parameters during operation of the installation were: the voltage supplied to the electrodes (100...200 V); capacity of discharge capacitors (25...65 μF); discharge frequency 50...100 Hz.
When an electric discharge occurs, the electrodes and wastes are instantly destroyed and the smallest powder particles are formed. The granulometric composition of the obtained powder was carried out using the Analysette 22 NanoTec particle size analyzer. The development of a mathematical model of the process of obtaining lead brass powder was carried out by conducting a full factorial experiment of type 23.
Results. As a result of mathematical calculations, the maximum value of the optimization output parameter (average particle size) was determined, which was 23.8 μm at the following values of the factors (dispersion modes): the voltage supplied to the electrodes is 200 V, the discharge frequency is 100 Hz, and the capacity of the discharge capacitors is 65 μF.
Conclusion. On the basis of the obtained results of studies and calculations, it is possible to conclude that by changing the operating modes of the EDM installation, it is possible to obtain powders of different sizes. The voltage applied to the electrodes and the capacity of the discharge capacitors have the greatest influence on the particle size of the resulting charge. When the values of these parameters increase, the mass yield of the powder increases, which directly depends on the size of the obtained particles.
The obtained regression equation makes it possible to determine at which operating modes of the installation it is possible to obtain powder of a given particle size.

Purpose. Justification and description of a laboratory method for measuring static magnetization curves specialized for ferrocolloids.
Methods. The measurement method is based on the paramagnetism of magnetic colloids and the quasi-linear response of their magnetisation to small perturbations of the external magnetic field. To obtain the magnetisation curve, the studying ferrocolloid sample is placed in a constant homogeneous field of a laboratory electromagnet with an iron core. By low-frequency modulation of the current in the coils of the electromagnet, a co-directional perturbation is applied to the constant field. Information about the response of the sample to the external field perturbation - the differential magnetic susceptibility of ferrocolloid - is extracted by electrical measurements. These measurements are carried out using a classical compensation device of two counter-connected wire coils, one of which contains the investigated sample. Conducting (sweeping) the measurements in a wide range of applied fields allows to collect a sequence of experimental values of differential susceptibility from which the desired magnetisation curve is reconstructed by numerical integration.
Results. The experimental setup for measuring the magnetisation curves of ferrocolloids was assembled. A theoretical description of the compensating electrical measuring device of the setup was proposed. The adjustment of the electrical scheme was carried out within several series of calibration experiments aimed at establishing the material parameters of the setup that were unknown from the theory. On the example of ferrocolloid of the type “magnetite - kerosene – oleic acid” both the process of obtaining primary experimental data and their subsequent processing, including the procedure of numerical integration, were demonstrated. It is established that the use of integration methods of a higher accuracy allows reducing the number of required experimental points and accelerating the measurement process without reducing the quality of the obtained curves.
Conclusion: The method applicable for measuring the magnetisation curves of ferrocolloids by differential sweeping is described, substantiated and implemented using laboratory equipment.

Purpose. Investigate the structural features of boron nitride films obtained by the Langmuir-Blodgett method. Observe fluorescence spectra and determine the band structure of the resulting coatings using optical methods.
Methods. The deposition of Langmuir films was carried out using the KSV NIMA 2002 setup from the colloidal solution of ST BN/CHCl₃. The study of optical properties was conducted using the SF 2000 spectrophotometer in spectral range 200 – 1100 nm and the confocal Raman microspectrometer OmegaScope AIST-NT with spectral resolution 3 cm^-1. Surface morphology investigation was performed using the scanning probe microscope SmartSPM AIST-NT with standard silicon cantilevers NSA10, tip radius 7 nm. The band structure modeling of stabilized boron nitride nanoparticles was carried out using the MaterialsStudio 2020 software package with the CASTEP module.
Results. The spectral characteristics of deposited film structures made of stabilized hexagonal boron nitride nanoparticles have been investigated. The hydrodynamic size of the nanoparticles was determined to be ~100 nm using optical methods, while the lateral size of the nanoparticles in Langmuir films was found to be 84.6 nm, calculated from the spectral peak at 1360 cm^-1 with E2g symmetry, and 82.4 nm based on scanning probe microscopy data. Absorption and fluorescence spectra of colloidal particles were obtained, showing an unusually large Stokes shift of 105 nm and a quantum yield of 0.72. The bandgap width of the stabilized nanoparticles was measured using the Tautz method and ab-initio modeling, resulting in values of 5.79 eV and 5.46 eV, respectively.
Conclusion. The study examines the surface morphology, optical properties, and band structure of the deposited Langmuir films made of stabilized boron nitride nanoparticles.

The purpose of the study is to analyze the effect of a surface electric charge on the formation conditions of the Faraday ripples on a horizontal surface of a low-viscosity liquid in a vibration field.
Methods. The problem is solved analytically in the limit of small amplitude deformation of the free surface of the liquid. The final relation is derived under the condition that the dissipation is small. The liquid was considered ideally conductive with a surface-distributed electric charge.
Results. A simple analytical expression is derived that quantitatively describes the effect of suppression of the Faraday ripple if the surface density of the electric charge increases. It is shown that the increase in the surface density of the electric charge significantly enlarge the threshold value of the vibration field amplitude, the excess of which leads to the formation of ripples. The threshold value of the vibration amplitude is proportional to the viscosity of the liquid and depends on its density, surface tension coefficient and the specific horizontal scale of the ripple.
Conclusion. The Faraday’s ripple formed on the surface of a liquid in a vertically oscillating container is very sensitive to the value of the surface density of the electric charge. An increase of the surface charge density leads to suppression of the ripple formation. The effect can be used to prevent the appearance of parasitic convective flows that arise in liquid layers placed in vibration fields. The physical mechanism of Faraday ripple suppression is the rivalry between two qualitatively different types of flows near the liquid surface. Increasing the surface charge density changes the balance of surface forces in such a way as to promote the appearance of aperiodic motions and suppress oscillatory ones. In particular, oscillatory motions responsible for the development of Faraday instability caused by vertical vibrations of the liquid container are suppressed.

Purpose. Investigate the damping of an oscillatory system with incomplete sealing of the air cavity with a magnetic fluid.
Methods. The study was carried out on an experimental setup developed on the basis of known methods and equipment for magnetic measurements and manufactured independently. A ring neodymium magnet (NdFeB alloy) 60x24x10 mm in size was used as a magnetic field source. The magnetic field strength at the center of the magnet, measured with a TPU-01 milliteslamer, is 220 kA/m. An inductor, a GVT-427B amplifier, and a GwInstek GDS-72072 digital oscilloscope were used to display oscillograms. Samples of magnetic fluid based on Fe₃O₄ magnetite stabilized with oleic acid were studied. Kerosene was used as the carrier liquid.
Results. The results of an experimental study of the elasticity and damping of an oscillatory system with incomplete sealing of the air cavity by a magnetic fluid bridge are presented. The level of sealing of the air cavity varies due to the process of pumping gas through capillaries of various radii. To explain the regularities obtained, a model theory is proposed in the approximation of a viscous gas flow according to the Poiseuille law, and the conclusions of the wellknown theory of sound propagation in molecular acoustics and the theory of sound ducts are also drawn. The relaxation mechanism imposes a restriction on the type of vibrational gas flow through the capillaries, which takes into account the "throughput" capacity of the capillaries. The proposed model explains the presence of a maximum in the dependence of the attenuation coefficient on the capillary radius and its decrease with an increase in the volume (height) of the gas cavity.
Conclusion. The proposed relaxation theory of vibrational gas flow through capillaries predicts anomalously large damping coefficients and almost complete damping of an oscillatory system with a magnetic fluid inertial element. The use of the data obtained is advisable in the design of new shock absorbers, since a magnetic fluid damper with capillaries is capable of damping low-frequency oscillations.

The purpose of this work is to study the features of the electrical properties of bounded semiconductors, as well as the effect of the inhomogeneous distribution of impurities in anisotropic semiconductors on the structure of electric fields with standard methods of contact measurements.
Diffusion and ion-doped semiconductor structures, as well as composite structures with misalignment of film and substrate lattices, are currently a promising class of materials in micro- and nanoelectronics. The introduction of an impurity into a semiconductor crystal sample changes its electrical properties, which makes it possible to reduce the size of individual components of the chip, while maintaining or increasing their power.
Methods. The results of the work are based on the known dependences of the distributions of impurities during diffusion alloying. To calculate the potential distribution, the Fourier method was used, which made it possible to solve the Poisson Equation with Neumann boundary conditions without approximations. The mathematical package MathCad was used to analyze the obtained expressions characterizing electric fields in inhomogeneous semiconductors.
Results. A technique for solving the boundary value problem for the potential in bounded diffusion semiconductors is presented. Expressions in the form of series of analytical functions for the distribution of electric potential in conducting anisotropic structures are presented. The constructed models make it possible to determine and qualitatively describe the distributions of electric fields during probe measurements and to investigate their structure in diffusion semiconductors.
Conclusion. On the basis of computer modeling, the importance of taking into account the parameters of inhomogeneity of conductivity is shown. The effect of concentration of current density lines in diffusion semiconductors is shown and quantified.

Purpose. Establishment of the mechanism of formation of nanofilms from ultrafine two-dimensional crystals of hexagonal boron nitride.
Methods. Film structures from ultrafine two-dimensional crystals of hexagonal boron nitride were created both on the surface of a filament separated from a PA-6 polyamide yarn and on a silicon substrate. Ultra sonication was used to fix UC hBN from an aqueous colloidal system on surfaces. The characterization of UC hBN and films made from them was performed by the following methods: сщт scanning electron with energy dispersive elemental analysis, probe atomic force microscopy, vibrational Fourier IR spectroscopy (and Raman (Raman) scattering, as well as fluorescence spectroscopy, X-ray diffractometry and X-ray phase analysis, small-angle X-ray scattering.
Results. The dependence of the intensity of the E_2g line (I = 1362.8 cm^–1) in the RS spectrum of a film structure deposited on the surface of aqueous CS UC hBN filaments on the time UST – tUST has been studied. Based on the results of the analysis of confocal, SEM and AFM images, RS and FS spectroscopy, the multilayer nature of the UC hBN film structures on the surface of the filaments and the silicon wafer was proved. The FS spectrum contains excitations on lines lying inside the band gap.
Conclusion. The formation of structures on the surfaces of filaments and a silicon plate from an aqueous CS of UC hBN particles after UST occurs due to either covalent bonds in the plane of hexagons with abnormal sizes up to 1 μm, or van der Waals and ionic-covalent bonds with the formation of multilayer structures with heights from 3.6 to 340 nm.

Purpose of research is to study the influence of ferromagnetic carbon nanotubes on orientational transitions in magnetically compensated liquid-crystal suspensions.
Methods. The problem was solved in the framework of the continuum theory. By minimizing the Helmholtz free energy functional, a system of Lagrange-Euler equations is obtained that determines the equilibrium dependences of the orientation angles of liquid crystal and impurity ferromagnetic carbon nanotubes directors, as well as the concentration distributions of the dispersed phase of the suspension as a function of the transverse coordinate, material parameters, and magnetic field strength.
Results. It is shown that in the presence of an external magnetic field, a liquid-crystal suspension of ferromagnetic carbon nanotubes can be in a non-uniform phase (angular phase) and two uniform phases (planar and homeotropic phases). Expressions for the threshold fields of transitions between coexisting orientational phases are obtained analytically as functions of the material parameters of the composite. Diagrams of the orientational phases of the suspension are plotted.
Conclusion. As a result of the research, it was shown that the addition of low concentrations of ferromagnetic carbon nanotubes can significantly reduce the threshold of the magnetic Fréedericksz transition compared to a pure liquid crystal, which is important for various technical applications. The obtained analytical formulas for the threshold fields of transitions between different orientational phases can be used to determine the anchoring energy and material parameters of suspensions of ferromagnetic carbon nanotubes in a liquid crystal.

Purpose of the study. Study and comparison of the antioxidant properties of ablated cerium dioxide nanoparticles in the oxidative photocatalytic degradation of methylene blue ablated from imported and laboratory targets.
Methods. By pressing cerium dioxide powder and annealing the pressed target, laboratory targets were obtained, which were subjected to the laser ablation process. Atomic force microscopy was used to characterize cerium dioxide nanoparticles. The spectrophotometric method was used to study the antioxidant properties of cerium dioxide nanoparticles. The antioxidant activity of ablated nanoparticles obtained from two targets in an oxidative photocatalytic reaction has been studied and compared. Cerium dioxide nanoparticles with high antioxidant activity were obtained by laser ablation.
Results. Using atomic force microscopy, the average limiting sizes of non-centrifuged and centrifuged samples at a speed of 1000 rpm of ablated cerium dioxide nanoparticles were established. It was found that the elemental composition of the cerium dioxide powder, from which the laboratory target was pressed, and the elemental composition of the imported target are the same, and the percentage of impurities in them is within the limits acceptable for the laser ablation process. The antioxidant activity of cerium dioxide nanoparticles ablated from laboratory and imported targets was compared. The data obtained in the course of the study indicate that cerium dioxide nanoparticles obtained from a laboratory target exhibit the highest antioxidant activity.
Conclusion. Cerium dioxide nanoparticles subjected to laser ablation from a laboratory target are nanomaterials that are antioxidants that inactivate reactive oxygen species in a photocatalytic reaction. The antioxidant activity of cerium dioxide nanoparticles obtained from a laboratory target is not lower, but higher than that of nanoparticles obtained from an imported target. These properties of cerium dioxide nanoparticles are due to the presence of crystalline defects such as oxygen vacancies on their surface.

Purpose. Preparation of a colloidal solution stabilized with stearic acid of hexagonal boron nitride nanoparticles, analysis and visualization of structure formation and its spatial characteristics, creation and study of floating monolayers on the water surface.
Methods. The determination of the chemical structure was carried out using IR spectroscopy; modeling of the crystal structure and processes of colloidal solution synthesis was carried out using the Materials Studio 2020 software package with CASTEP, Forsite, Blends Calculation and Dmol3 modules; study of the formation of a monolayer on a setup for the formation and study of monolayers by the Langmuir-Blodgett method KSV Nima 2002, equipped with a Wilhelmy balance, Brewster microscopy and thermal stabilization.
Results. A colloidal system of hexagonal boron nitride nanoparticles stabilized with stearic acid has been synthesized. The absence of chemical reactions and molecular deformations of stearic acid in the dispersed medium of a colloidal system (chloroform), as well as deformations of crystalline and molecular structures during passivation of stearic acid molecules on the surface of hexagonal boron nitride nanoparticles are shown using first-principles modeling. IR spectroscopy methods have established the complete evaporation of the dispersion medium and the fact of stable stabilization of nanoparticles. The obtained IR spectroscopy results are in good agreement with ab-initio modeling data showing the attachment of stearic acid molecules to the surface of hexagonal boron nitride nanoparticles by polar groups containing oxygen atoms, since in this case the minimum energy value of this system is achieved.
Conclusion. The paper shows the possibility of stable stabilization of hexagonal boron nitride nanoparticles by stearic acid molecules and subsequent creation of a monolayer from them for deposition of defect-free thin films by the Langmuir-Blodgett method with demanded mechanical, electrical, optical and thermal properties.

The purpose of this work was to determine some physicochemical and adsorption-structural parameters of sawdust and their modified analogues.
Methods. To determine the physicochemical and adsorption-structural parameters of sawdust and their various modifications, gravimetric, potentiometric, titrimetric methods of analysis were studied.
To study the structure of sawdust, a Nicolet iS50 IR Fourier spectrometer and an OmegaScope™-SPM microscope with a confocal Raman and fluorescence spectrometer were used. The creation of molecular structural formulas was carried out in the integrated ChemOffice software package in ChemDraw 3D.
Results. The data obtained showed that the sorption capacity of sawdust depends on the type of modification and on changes that have occurred at the molecular level. The greatest changes occurred with the type of modification of sodium hydroxide, the greatest formation of hydroxyl and carboxyl groups was noted.
The results of IR spectrometry indicate that changes in the structure of the modified sorbents indicate a possible improvement in the ability of sawdust to sorb, including direct dyes.
To determine the physicochemical parameters of sawdust and their various modifications, such characteristics as humidity, pH of the medium, settling rates, swelling, porosity, and bulk density were studied.
The determination of the clarifying ability and adsorption activity of sawdust of various modifications was carried out using methylene blue. All samples of sawdust exhibit sorption properties, they can adsorb molecules ranging in size from 0.63 to 1.26 nm.
Determined adsorption activity for iodine, characterized by iodine number and adsorption activity. The adsorption activity for iodine differs significantly (5.874-13.494), which is due to the different mechanism of sorption on various modifications of the cellulose sorbent
Conclusion. In this work, it is confirmed that the modification of sawdust with substances having an acidic and alkaline environment will positively affect the degree of sorption of the sorbent. Sawdust modified with 1% and 5% NaOH has the highest sorption capacity.
With the help of IR spectroscopy, it has been proved that in the process of modification, changes occur in the sorbents at the structural level.