Purpose. Study of the composition, structure and properties of antifriction alloys based on the electroerosion charge of bronze BrO5C25 obtained in a carbon–containing medium lighting kerosene.
Methods. Dispersion of the waste of the BrO5S25 alloy was carried out at an installation for electrodispersing electrically conductive materials. The waste of the BrO5C25 alloy was used as metal waste. Lighting kerosene was used as the working fluid.
As a result of exposure to short-term electrical discharges between the electrodes and the waste, their destruction occurred with the formation of fine particles. To obtain compacted materials, a Herzog TP 20 manual table press was used. Modern equipment and complementary methods of physical materials science were used to study the composition, structure and properties of the sintered products obtained.
Results. Surface analysis showed that the alloys have a fine-grained structure, uniform phase distribution and a small number of pores. The analysis of the elemental composition found that carbon is contained on the surface of the new alloys, and all other elements Sn, Cu and Pb are distributed relatively evenly. The analysis of the studied alloys showed the presence of phases in them: Cu, CuSn, SnO, CuO, PbO, Pb. There are no carbide-forming elements in the alloy. It has been experimentally established that the composition, structure and properties of the charge dispersed by electroerosion of bronze BrO5C25 affect the tribological properties of the alloy blanks. In particular, the presence of free carbon in the alloy from the electroerosion charge obtained in kerosene, which acts as a solid lubricant, leads to a decrease in the coefficient of friction.
Conclusion. It is shown that alloys obtained from an electroerosive charge have higher microhardness values in comparison with an alloy obtained from an industrially used charge. A significant increase in the microhardness of alloys is explained by the presence of highly hard particles formed during the quenching of metal vapors in the working fluid during dispersion. The presence of small fractions in electroerosive materials contributes to an increase in the density of compressions and a decrease in the porosity of workpieces.

The purpose of the study is to determine the effect of nanosized additives on the structure and properties of the T15K6 hard alloy.
Methods. These studies were carried out using an S-3400N electron microscope. The mechanical and physical properties of the structure of a hard alloy of the WC-TiC-Co system were studied using the example of T15K6 when nanosized tungsten powder and nanosized tungsten carbide powder with cobalt deposited on it were introduced into the initial charge using an optical and electron microscope; An X-ray spectrum analysis of the obtained samples of the T15K6 hard alloy was carried out on a DRON-4 X-ray diffractometer.
Results. A hard alloy of the WC-TiC-Co system was studied with the introduction of nanosized tungsten powder into the initial charge, as well as with the introduction of nanosized tungsten carbide with cobalt deposited on its surface.In the work, the used powders of tungsten, nano-tungsten, cobalt, titanium carbide, tungsten carbide, nano-powder of tungsten carbide were studied, and the microstructure of the obtained hard alloys was also studied. It is shown that the coercive force of the T15K6 alloy depends on the size of the cobalt phase regions in the alloy; measuring its value makes it possible to judge the size of carbide grains. To improve the strength properties of hard alloys of the WC-TiCCo system, it is recommended to introduce nanosized WC additives or WC nanopowder with deposited cobalt.
Conclusion. To improve the strength properties of hard alloys of the WC-TiC-Co system, it is recommended to introduce nanosized WC additives or WC nanopowder with deposited cobalt. The introduction of these additives into the composition of the powder charge of the T15K6 hard alloy leads to an increase in the ultimate bending strength by 15%. The introduction of nanosized WC additives or WC nanopowder with deposited cobalt makes it possible to obtain a fine-grained structure with a grain size of no more than 4–6 μm.

The purpose of this study was to conduct metallographic studies of the composition of the charge obtained by the method of electrodispersion of lead brass waste in distilled water.
Methods. Waste electrodispersion of lead brass brand LS58-3 was carried out on an experimental setup. Metallographic studies of charge samples from LS58-3 alloy waste were performed using the equipment of FGBOU VO SWGU and NRU BelGU: the shape, size and structure of charge particles, as well as its granulometric composition.
Results. On the basis of the conducted experimental studies aimed at studying the composition, structure and properties of the charge obtained from the waste of the LS58-3 alloy in distilled water, the high efficiency of using the electrodispersion technology is shown, which provides, at low power costs, the production of new copper-lead powders suitable for industrial use. materials. It is noted that the powder materials obtained by electroerosion of lead brass waste of grade LS58-3 in distilled water have the following characteristics: the geometric shape of the charge particles is mainly spherical; particle sizes from 0.45 to 29.63 microns; the volume average particle diameter is 7.1 μm.
Conclusion. The research carried out will allow for a gradual transition to advanced production technologies and materials through the use of progressive, environmentally friendly, low-tonnage and waste-free technology of electroerosive dispersion in the production of new copper-lead powder materials from LS58-3 alloy waste.

The purpose of the work was to study the effect of laser modification of the cutting edge on changes in the structure and mechanical properties of the surface layer of parts made of hot–rolled structural carbon steels of grades 20, 35, 45 using a fiber laser.
Methods. Structural carbon steels of grades 20, 35, 45 were selected as the objects of the study. To study the effect of laser modification on changes in the structure and mechanical properties of machine parts using laser cutting, special samples were made in the form of plates with a thickness of 2 mm (st20 and st45) and 4 mm (st35). After gas laser cutting, laser modification of the Q-switch cutting edge was performed with a fiber pulsed laser.
Results. The regularities of changes in the structure of the zone of gas-laser thermal exposure after laser treatment (cutting, modification) are revealed. It has been established that repeated laser treatment (laser modification) of the cutting edge does not lead to a change in the structural components and microhardness in the zone of gas-laser thermal effects obtained after laser cutting. It has been established that the nature of the microhardness change is the same for all the studied steel grades: the highest values are reached near the surface of gas-laser treatment and are, for example, for steel grade 35 470-560 HV, which is 3,2-3,9 times greater than the initial microhardness (145 HV). Thus, a hardened layer with increased wear resistance is formed on the surface of the part after laser treatment. It is shown that the use of laser surface modification as an additional operation in the manufacture of parts by laser cutting makes it possible to improve the quality (roughness) of the surface layer. At the same time, the greatest effect of reducing roughness is given by laser modification in three passes along the X-Y plane.
Conclusion. The results obtained can be used in the creation of resource-saving material processing processes.

Purpose of research the aim of the work is to develop an effective technology for surface hardening of the crankshafts of KAMAZ 740 engines, restored by re-grinding to repair dimensions, by means of their accelerated low-temperature nitrocementation in the conditions of car service (car repair) enterprises.
Methods. Nitrocementation of the samples was carried out in a nitrogen-carbon paste. The samples with a nitrocementating coating were heated in a laboratory furnace with a vertical load of SSHOL-12-M3-U4. The nitrocemented samples were subjected to metallographic analysis using an Axio Observer.A1m optical microscope and a Quanta TM 3D200i electron scanning microscope. Phase analysis of diffusion layers on samples nitrocemented according to various modes was carried out on an XRD-7000S X-ray diffractometer. The microhardness of the nitrocemented samples was measured using a Duramin-5 microhardness meter with a computer and software. The hardness of the nitrocemented samples was measured on a TK-2M (Rockwell) hardness tester on the "A" scale according to the standard method.
Results. The technology of low-temperature nitrocementation of nitrided crankshafts of KAMAZ vehicles after their repair by grinding with the removal of the hardened layer from the surfaces of the root and connecting rod necks is presented. It is shown that nitrocementation of 42HMFA steel, from which crankshafts are made, at a temperature of 520...580 °C for 3 hours in a highly active paste ensures the production of hardened layers in depth, structure, phase composition and hardness are almost identical to nitrided layers. Such nitrocementation can be a full-fledged and effective replacement for the re-nitriding of the restored shafts provided for in the technical documentation for the repair of KAMAZ engines, categories E-2, E-3 and E-4.
Conclusion. The low labor intensity and technological simplicity of nitrocementation will allow it to be used to strengthen the crankshafts of all seven repair sizes provided for these parts, which can give a very large economic effect.

The purpose of this work was to optimize the process of obtaining a charge of lead-antimony alloy SSu3 by the electroerosion method in distilled water according to the criterion of average particle size.
Methods. At the experimental facility for the production of lead-antimony powders from conductive materials, the waste of the SSu3 alloy was dispersed in distilled water at a loading weight of 250 g. The following electrical parameters of the installation were used: voltage at the electrodes from 100–200 V; capacitance of capacitors 25–65 UF; pulse repetition frequency 25–50 Hz. The average particle size was studied using the Analysette 22 NanoTec plus laser particle size analyzer. The determination of the optimal parameters of the EED installation was carried out by setting up a complete factorial experiment (PFE) on the average particle size of the obtained electroerosive materials. The parameters of the EED installation operation were selected as factors: the voltage at the electrodes, the capacitance of the discharge capacitors and the pulse repetition rate.
Results. According to the conducted series of experiments, the results of which are presented in the table, the limiting values of the optimization parameter y (the average size of electroerosive particles) were determined, which amounted to: 44 microns with a capacity of 65.5 UF discharge capacitors, a voltage at the electrodes of 200 V, a pulse repetition frequency of 75 Hz.
The conducted studies have shown that by the method of electroerosive dispersion of SSu3 alloy waste in distilled water, it is possible to obtain an alloy powder with a uniform distribution of alloying elements.
Conclusion. Optimization of the process of obtaining the charge of lead-antimony alloy SSu3 by the electroerosion method in distilled water according to the criterion of the average particle size was carried out. The results obtained can be used by enterprises of the industrial sector for the production of lead-antimony powder.

The purpose of the work was to study of the regularities of changes in the physico-mechanical and corrosion properties of reinforcing steel 23Kh2G2T in hot-rolled and heat-treated (furnace tempering) states.
Methods. The study of the physical and mechanical properties and resistance (long-term corrosion resistance) of bar reinforcement to stress corrosion cracking (SCC) was carried out on experimental melts of steel grade 23Kh2G2T. The choice of melts was made in such a way that their chemical composition corresponded, if possible, to the upper, middle and lower levels of the grade composition.To create experimental conditions as close as possible to operational ones, the tests were carried out in a boiling solution of nitrates (60% Ca(NO3)2 + 5% NH4NO3 + 35% H2O) at a temperature of 110°С and operating voltages σe = (0,1–0,8 )σВ. To elucidate the features of transformations occurring in steel during tempering, the temperature dependences of internal friction were taken from samples tempered at different temperatures.Processing of the results of the time dependence of the amplitude-independent internal friction was carried out according to the theory of Granato, Hikata, Lucke, which describes the kinetics of the return of internal friction due to the migration of point defects to dislocations.
Results. It has been established that by controlling the chemical composition and technological regimes for the production of steel 23Kh2G2T, it is possible not only to sharply increase its resistance to cracking, but also to obtain a guaranteed complex of mechanical and corrosion properties. It was revealed that reinforcement made of 23Kh2G2T steel should be produced with mandatory tempering. The greatest resistance to stress corrosion cracking with practically unchanged strength for reinforcement made of steel 23Kh2G2T is provided by 2-hour tempering in the temperature range of 350…400°С.
Conclusion. The results obtained can be used to establish patterns of behavior of various types of ingot, powder and composite materials with high dispersion in phase and structural components in various conditions and states.

Purpose. Obtaining, characterization and mathematical description of atomic force microscopic images of 1D-dimensional whisker-like nanocomposite structures formed under the conditions of high-intensity laser processing using.Formation of polycarbonate with inner thin layers of Al, semiconductor metals Si, Sb, Te, Ge, and ZnS and SiO2 compounds in a DVD-R-5 disc covered with aluminum foil.
Methods. Applied pulsed laser radiation for laser processing of DVD-R-5 was used. The methods of confocal, atomic force and scanning electron microscopy to study microand nanostructuring after laser processing of DVD-R-5 patterns were used. The direct and inverse Fourier transforms atomic force images were carried out. Analysis of solutions to the heat balance equation as applied to the results of laser processing was performed.
Results. Under high-speed exposure to laser radiation (TEM01 or TEM10 modes) on a DVD-R-5 sample coated with aluminum foil, VNS were detected and studied. With the help of direct and inverse Fourier transforms on atomic force images of the surface after laser processing, the periodicity of the formed VNS was confirmed. It is shown that the process of DVD-R-5 laser processing is adiabatic, the propagation velocity of the melting wave front exceeds the sonic one in polycarbonate. The conclusion about the formation of VNS due to self-focusing and filamentation of laser radiation in the reflected diffracting beams of each of the mode components is substantiated.
Conclusion. Under conditions of high-intensity laser processing by repetitively pulsed laser radiation with the TEM01 or TEM10 modes, 1D-dimensional VNSs are formed with a thickness at the base of up to 0.5 μm and a height of more than 1 μm, the composition of which can include both conductors, semiconductors, and their compounds. The resulting WNSs have a highly developed ordered surface structure, which may indicate that their application is promising.

Purpose To study the possibility of changing cathode injection in a grid axisymmetric EHD transducer with planeparallel modified electrodes.
Methods. An estimate of the influence of the edge effect of electrode grids on the surface conductivity in the periphery of the interelectrode gap was obtained by numerical simulation, and the optimal geometry of the electrode holders of the grid EHD transducer was determined. Using the method of numerical calculation in the software environment Agros 2D, as well as using the analysis of SEM scans and the method of estimating the form factor of structures, the parameters of local electric fields of the structures of the surfaces of wires of grid electrodes modified during laser scribing were obtained.
Results. The results of the development of a grid system of electrodes for electrohydrodynamic converters with enhanced cathodic charge injection are presented. The influence of the edge effect on the operation of EHD transducers is analyzed. The possibility of improving the grid electrode system of a model EHD pump is described. The composition and shape of microand nanostructures after scribing on the FMark-20RL laser marking complex have been studied. A qualitative estimate of the local electric field strength on nanostructures obtained by laser scribing of brass grids with a characteristic radius of 50 nm is made, which indicates an increase in the cathode injection of negative charges in the EHD system. With a distance between the electrodes of 1.5 mm and a potential difference between the electrodes of 1.5 kV/cm, the magnitude of the local tension at the top of the nanostructure with a curvature radius of about 50 nm can reach 5.5⋅107 V/cm.
Conclusion. Laser scribing in the form of concentric circles of brass grid electrodes makes it possible to intensify cathodic charge injection by amplifying local electric fields from microand nanostructures. The use of plexiglass dielectric holders can reduce surface leakage currents at the periphery of grid electrodes.

Purpose. Investigate the shape and stability of a magnetic fluid coating on a flat surface in a non-uniform magnetic field of a permanent magnet.
Methods. Magnetic fluids based on transformer oil MMT-44 and MMT-21 with saturation magnetization of 43.8 and 21.2 kA/m, respectively, were used in the experiments. A magnetic-fluid coating was formed on the surface of horizontal and vertical non-magnetic plates in a locally inhomogeneous magnetic field of permanent magnets. The source of the inhomogeneous magnetic field is a system of two rectangular magnets. The size of the magnetic system is 40×12×10 mm. The maximum values of the magnetic field strength and gradient reach 180 kA/m and 8∙104 kA/m2, respectively. The shape and stability of a sessile and suspended magnetic fluid coating were studied for various plate orientations.
Results. The shape and stability of the magnetic fluid coating on horizontal and vertical plates are studied. The experimental dependences of the height and length of the coating on the volume of the magnetic fluid are established. It is established that the coating can have a certain maximum volume. When this volume is exceeded, the liquid spreads over the surface of the plate or a part of the liquid volume is separated. The limiting volume of the coating is determined by the magnetic characteristics of the ferrofluid and the magnetic field.
Conclusion. The possibility of forming a sessile and suspended local magnetic fluid coating on horizontal and vertical plates is established. The height and length of the magnetic fluid coating on the plate depend on the volume of the magnetic fluid, as well as on the characteristics of the magnetic system and the magnetization of the magnetic fluid. The results obtained can be used in the formation of magnetic fluid coatings of cooled sections of heated surfaces.

Purpose. The study of cluster formation in a system of chaotically moving and interacting particles taking into account the Efimov effect and the "golden" section.
Methods. Methods of mathematical modeling, quantum mechanics, a model of solid spheres, and a cluster model were used.
Results. Within the framework of the proposed work, it is noted that in a three-particle system of particles, it is possible to form their spatial configuration in the form of a "golden" triangle, and in the case of an excited state of two particles, the third particle is far enough away from the other two, it is this configuration that corresponds to the conditions for the occurrence of the Efimov effect in a three-particle system.
Based on the mathematical formalism of the description of self-organization processes in the work, it is shown that in chaotic environments within the framework of the Efimov model, with the involvement of the "golden" section in the mutual arrangement of three interacting particles, it is possible to form disk-shaped clusters containing a "magic" number of particles. In the structure of these clusters, the formation of quantum-dimensional regions in the form of a torus is possible. The parameters of such areas are defined.
Conclusion. The described model of the formation and decay of disk-shaped clusters, taking into account the Efimov effect and the "golden" section rule, allows us, without resorting to a complex solution of equations in the three-body problem, to obtain important relations following from strict theories. The proposed approach implies the possibility of self-organization of clusters and the formation of quantum-dimensional regions in their structure, for example, in the form of a torus with a potential well, capable of capturing charged particles and determining their energy spectrum, as well as explaining the appearance of spectral bands in the IR spectra of substances.
The proposed approach may be of practical importance, for example, for predicting the IR spectra of liquids, the presence of quantum dots in liquids with a wide spectrum of excitation from UV to IR radiation.

Purpose. Formation and studying the sensory properties of multilayer nanocomposite electrophoretic CuO/CNPs films in the infrared range.
Methods. Study of the morphology and size composition of CuO/CNPs nanocomposite films using atomic force microscopy and scanning electron microscopy; determination of the chemical composition using X-ray diffractometry, the study of sensory sensitivity under infrared irradiation with a fiber-optic laser source with a wavelength of λ = 1064 nm; study of the temporal characteristics of the induced photoelectromotive force using optoelectric measurements (ADC L-CARD E2010D) interfaced with a personal computer.
Results. Nanocomposite CuO/CNPs films 0.1 to 1 µm thick were obtained by electrophoretic synthesis on a glass substrate. It has been established that CuO/CNPs nanocomposite films are formed due to the ordered structuring of carbon nanoparticles along the direction of the electric field under the action of electrophoretic forces. At the same time, due to the electrolytic process, a layer of copper oxide from metal electrodes is formed on the surface of the carbon particles. The limiting size of carbon particles was 50-70 nm, depending on the parameters of film production. A technique has been developed for producing multilayer CuO/CNPs composite films with a thickness of one to ten layers. It has been established that when the synthesized ten-layer nanofilms are irradiated with infrared radiation with an intensity of 75 mW/cm-2, the value of the photogenerated EMF reaches 122.5 mV.
Conclusion. Multilayer nanocomposite CuO/CNPs films with infrared sensor properties were obtained. It has been established that with an increase in the thickness of the synthesized films from one to ten layers, the photo-EMF under IR irradiation with an intensity of 75 mW/cm-2 increases from 17 to 122.5 mV.

Purpose. Analytical and numerical description of the magnetohydrodynamic forces acting on a small nonmagnetic spherical body in a cylindrical container with magnetic fluid (magnetofluid dispenser and separator approximation) that determine the hydrostatic mechanical equilibrium in the system.
Methods. The numerical study solves the magnetostatic problem by the finite element method in the FEMM program package using the Lua script language. The system of Maxwell’s equations is solved by the standard method in the vector potential formulation. The analytical solution of the magnetostatic problem is obtained by the mirror image method using a simplifying model representation of the linear law of magnetization of a magnetic fluid. The ponderomotive force acting on a body immersed in a magnetic fluid is calculated using the Rosensweig formula and the energy approach.
Results. A refined expression for the magnetic ponderomotive force acting on a nonmagnetic sphere immersed in a cylindrical container with magnetized magnetic fluid is obtained. Direct numerical simulation of the laboratory experiment is performed, which allows us to compare the accuracy of the numerical and analytical solutions with the experimental data. Despite violating the limits of applicability of the analytical theory, the new expression correctly describes the nonmonotone coordinate dependence of the force, and the error in determining the coordinate extremums does not exceed 6 % and 26 % in absolute value. The physical justification for the condition of mechanical equilibrium in the model system under study is given.
Conclusion. The competition of two oppositely directed magnetic forces leads to the fact that a nonmagnetic sphere in a cylindrical container with magnetized magnetic fluid has one unstable mechanical equilibrium position in the center of the container, so that the body is pressed against the wall, or (additionally) two stable equilibrium positions that allow the body to levitate near the container wall without touching it.

Purpose of the study. Synthesis of cadmium arsenide magnetron films on various substrates and study of their structure, composition, optical and electrical properties.
Methods. The deposition of thin films of cadmium arsenide was carried out by the method of non-reactive highfrequency magnetron sputtering in an argon atmosphere. The structure and composition of the films were studied using X-ray phase analysis, scanning electron microscopy, energy dispersive analysis, and small-angle X-ray diffractometry. Optical studies were performed using Raman spectroscopy. The results of a study of the electrical properties of thin films of cadmium arsenide are presented.
Results. On silicon, sapphire, and strontium titanate substrates, thin films of the Dirac semimetal, cadmium arsenide, were obtained with a thickness of about 40 nm. A study of their structure and composition showed a significant effect of annealing in an argon atmosphere following deposition on the crystallinity of the film. After annealing, regardless of the crystal structure of the substrate, partial orientation of the film with the (112) texture axis. The films closest to the stoichiometric composition were obtained by deposition followed by annealing onto an oriented strontium titanate substrate, and to the crystal structure of cadmium arsenide single crystals of a film on a sapphire substrate. Annealing also leads to a smoothing of the film surface, a decrease in structural defects, and the transition of the fractal dimension of its topology to two-dimensional from close to three-dimensional immediately after deposition. The optical properties after annealing also change, which indicates their transition from a polycrystalline (amorphous) state to a single-crystal (textured).
Conclusion. Experimental studies of the structure and properties performed by various methods made it possible to establish that single-crystal or textured cadmium arsenide films suitable for studying the manifestation of topological properties can be obtained by controlled annealing.

The purpose of the work is to study the process of phenol sorption by wheat processing wastes. Much attention is paid to environmental protection in the modern world, especially water resources, since clean water is necessary for human existence. Modern enterprises of various industries and agriculture are increasingly introducing waste-free technologies or highly efficient wastewater treatment methods into production. One of the simple in hardware design and implementation, but very effective, is the sorption method. The use of production waste as sorbents is very promising, because. allows, in addition to the environmental problem, to solve the issue of disposal or recycling of production waste.
Methods.When studying the composition of chaff wheat, the following methods were used: determination of ash and moisture by weight; cellulose nitrogen-alcohol, pentosans spectrophotometric with orsin, lignin Komarov's method. Sorption of phenol by wheat processing waste was carried out by the method of single-stage static sorption at a temperature of 250C.
Identification of the nature of phenol sorption by non-food waste from grain processing was carried out using the IR spectroscopy method. Using the Nicoleti S50 FT-IR IR-Fourier spectrometer without molding tablets in the range of 4000 400 cm-1, the IR spectra of phenol, wheat chaff and wheat chaff after phenol sorption were taken.
Results. Analysis of the chemical composition of wheat waste (chaff) showed that the main components are cellulose (34.8%), pentazans (19.7%), lignin (23.1%).
When analyzing the obtained IR spectra, it was found that in the IR spectrum of non-food waste from wheat processing after phenol sorption, a peak appears at 2323.37 cm-1, which is associated with the formation of a bond between the mobile hydrogen atom of the benzyl alcohol group of lignin with the hydroxyl group of phenol .
Conclusion. IR-spectroscopic study of the process of sorption of phenol by non-food waste from wheat processing (chaff) showed that during the sorption of phenol, a chemical bond arises between the sorbent and the sorbate, which manifests itself in the IR spectrum as a new absorption band.

The purpose of this work was to study the isotherms of the process of sorption of Fe2+, Fe3+ ions by industrial waste from aqueous solutions.
Methods. As a sorbent, technogenic wastes from sugar production (defecation mud of Lgovsky Sugar Plant JSC), leather industry (chrome shavings from the Kursk Tannery OOO Kursk Kozha) and aviation instrumentation enterprises (galvanic sludge from Aviaavtomatika JSC named after V.V. Tarasova"). Fe2+, Fe3+ ions were chosen as sorbates, since the problem of iron removal is especially relevant for the Kursk region, due to the conditions of formation and the peculiarities of the formation of natural and waste waters.
As a scientific basis for the study of sorption, thermodynamic approaches are proposed, according to which sorption properties can be estimated by the value of the maximum working value of the transfer of a substance from a solution to the surface of sorbents. The mathematical models of Langmuir and Freindlich were used to describe the sorption isotherms. To determine the residual content of Fe2+, Fe3+ ions, calibration plots of the dependence of optical density on the concentration of Fe2+, Fe3+ ions in aqueous solutions were constructed using the sulfosalicylate photometric method.
Results. According to the equations of Freundlich and Langmuir sorption isotherms, the sorption isotherms were processed and analyzed, and the parameters of the process of sorption of Fe2+, Fe3+ ions by production waste from aqueous solutions were determined. The spontaneity of this process is established.
Conclusion. The results obtained showed the suitability of production waste as an inexpensive sorbent for the effective removal of Fe2+, Fe3+ ions from aqueous solutions in the range from 0.8636 to 8.636 g/dm3.
It has been established that the sorption of Fe2+, Fe3+ ions on production waste occurs in the form of monolayer sorption on the surface, which is homogeneous in sorption affinity and is described by Langmuir isotherms, which is confirmed by a high value of the confidence approximation (R2 = 0.9909-0.9955).
In the course of the work, it was found that galvanic sludge and defecation exhibit the greatest sorption capacity.