Proceedings of the Southwest State University. Series: Engineering and Technology最新文献

{"title":"Contribution of the Magnetic Subsystem to the Generation of Longitudinal Acoustic Waves during Domain Wall Motion in Yttrium Orthoferrite","authors":"E. A. Zhukov, V. I. Zhukova, A. P. Kuzmenko","doi":"10.21869/2223-1528-2023-13-4-54-65","DOIUrl":"https://doi.org/10.21869/2223-1528-2023-13-4-54-65","url":null,"abstract":"Purpose. Modern technologies in their development are increasingly in need of increasing the speed of processing and recording information. An alternative to semiconductor methods is magnetic memory based on changing magnetic moments. The speed of magnetization reversal is determined by the speed of motion of domain walls. The speed is maximum in weak ferromagnets. The purpose of this work is to study the effect of a magnetic wave generated by a moving domain wall on a longitudinal acoustic wave, taking into account the absorption of a magnetic wave in yttrium orthoferrite.Methods. The equation describing the effect of a magnetic wave generated by a moving domain wall on a longitudinal acoustic wave is solved using the following methods: the slowly varying amplitude method, the perturbation theory method, and the Lagrange method.Results. For an orthoferrite crystal, the contribution of the magnetic wave accompanying the motion of the domain wall in yttrium orthoferrite to the deformation of the amplitude of the longitudinal acoustic wave is calculated. This contribution in a bounded crystal, without taking into account the absorption of magnetic waves in the absence of the influence of acoustic waves on them, is of the order of 10-6 cm. In an unbounded crystal, the corresponding contribution, taking into account the absorption of magnetic waves, into the generation of longitudinal acoustic waves is of the order of magnitude 10-10 cm with a theoretical thickness of the domain wall D3 ≈ 10-6 cm.Conclusion. To study the mechanisms of the influence of a magnetic wave generated by a moving DW on a longitudinal acoustic wave, yttrium orthoferrite was taken. Since a weak ferromagnet is characterized by a significant increase in the magnetoelastic coupling when it overcomes the sound barrier. It is this circumstance that made it possible to experimentally observe the generation of elastic displacements by a moving domain wall. To develop devices for recording and processing information based on weak ferromagnets, it is necessary to fully investigate the mechanisms that affect the dynamics of a domain wall during its motion. Such a factor is the interaction of magnetic and acoustic waves with the domain wall, which can affect the quality of information processing. The evaluation of the contributions of these mechanisms can be used to develop the element base of devices for recording and processing information based on the magnetic memory of weak ferromagnets.","PeriodicalId":117184,"journal":{"name":"Proceedings of the Southwest State University. Series: Engineering and Technology","volume":" 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139616986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Model of a Magnetoactive Elastomer with Structure Parameter","authors":"O. Stolbov, Y. Raikher","doi":"10.21869/2223-1528-2023-13-4-75-87","DOIUrl":"https://doi.org/10.21869/2223-1528-2023-13-4-75-87","url":null,"abstract":"Purpose. To propose a simple and physically reasonable way to describe basic properties of magnetoactive elastomers under the action of magnetic field and/or mechanical loading.Methods. A phenomenological approach is developed, in the framework of which the aggregation of ferroparticles in a magnetoactive elastomer is interpreted as the appearance of an order parameter whose physical meaning resembles, although does not coincide entirely with, the number of the particles dwelling in aggregates normalized by the total number of the particles. The corresponding functional contribution to the free energy of the system is constructed in the form similar to that of the Landau-de Gennes expansion, as it is used in the theory of phase transitions. Depending on the presence of the cubic term in this expansion, the transition may develop along the scenarios of either I or II order.Results. In a model 1D calculation it is shown that the dependences of the main characteristics of the composite, viz. magnetization and deformation, on the applied field and mechanical load, might be in a unified manner described as being entailed by the evolution of the above-introduced order parameter. A specific feature manifested by the model system is its ability to display quasi-plastic response that exists as long as the external field is on, and to get back to elastic behavior as soon as the field is switched off.Conclusions. The results obtained are found to be in good agreement with the data obtained from the direct numerical modelling of the mesoscopic variant of the considered problem. In qualitative aspect, the discovered specific features of the rheological bahavior closely resemble the results of experimental studies om mechanical loading of magnetoactive composites consisting of a silicone rubber filled with micron-size particles of carbonyl iron.","PeriodicalId":117184,"journal":{"name":"Proceedings of the Southwest State University. Series: Engineering and Technology","volume":" 1084","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139617512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Determination of Mass and Quantitative Productivity of the Process of Electrodispersion of Nickel Waste in Isopropyl Alcohol","authors":"N. N. Horiakova, E. Ageeva, K. V. Sadova, N. S. Agarkov","doi":"10.21869/2223-1528-2023-13-4-43-53","DOIUrl":"https://doi.org/10.21869/2223-1528-2023-13-4-43-53","url":null,"abstract":"The purpose of this study was to obtain electroerosive dispersed nickel by processing nickel waste by electrodispersing in isopropyl alcohol, as well as to study the performance of this process and the particle size of the obtained dispersed nickel.Methods. Nickel waste in the form of plates was processed into powder by electrodispersion at an experimental electroerosive dispersion plant (RF Patent No. 2449859) in an isopropyl alcohol medium. The study of the average particle size of the obtained electroerosive dispersed nickel was carried out using a laser particle size analyzer \"Analysette 22 NanoTec\".Results. For the first time, spherical nickel powders in the medium of isopropyl alcohol were obtained from industrial waste by the method of electroerosive dispersion. The parameters of the electroerosive dispersion unit necessary for the dispersion of nickel waste have been determined. A directly proportional dependence of the mass productivity of the process of electroerosion research of nickel waste dispersion on the voltage at the electrodes in isopropyl alcohol in the range of 120-220 V. has been experimentally established. The optimum for dispersing nickel waste in isopropyl alcohol is the voltage at the electrodes in the range of 200-220 V. It is established that the smallest particle size is nickel powder obtained at a voltage of 220 V at the electrodes, while the mass productivity at this value of the voltage at the electrodes is the maximum.Conclusion. Based on the presented experimental studies of the mass and quantitative productivity of the process of electroerosive dispersion of nickel waste in isopropyl alcohol, a high efficiency of the use of electrodispersion technology for obtaining dispersed nickel powder, which is not inferior to industrially used powders in terms of average particle size, has been established. It has been experimentally established that the smallest particle size has a nickel powder obtained at a voltage of 220 V on the electrodes, while the mass productivity at this value of the voltage on the electrodes is maximum.","PeriodicalId":117184,"journal":{"name":"Proceedings of the Southwest State University. Series: Engineering and Technology","volume":" 771","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139617706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"X-ray Fluorescence Analysis of the Elemental Composition of Tungsten, Nickel and Copper","authors":"E. V. Ageevа, O. G. Loktionova, D. A. Ulitin","doi":"10.21869/2223-1528-2023-13-4-20-31","DOIUrl":"https://doi.org/10.21869/2223-1528-2023-13-4-20-31","url":null,"abstract":"The purpose of this work was to conduct an X-ray fluorescence analysis of the elemental composition of tungsten, nickel and copper metal waste using an Olympus Delta portable spectrometer.Methods. To determine the chemical composition of raw materials, samples of metal waste in the form of copper rods, tungsten rods of various diameters and scraps of nickel plates intended for recycling were examined. To determine the elemental composition of metal waste, the method of X-ray fluorescence analysis (XFA) was chosen. The X-ray fluorescence method is based on the ratio of the intensity of X-ray fluorescence to the concentration of elements in the sample. Samples irradiated with powerful X-ray tube radiation, in response, emit characteristic fluorescent radiation of atoms proportional to their concentration in the sample. This method allows us to qualitatively assess the elemental composition of complex samples without violating their physico-chemical properties with minimal time costs. The Olympus Delta spectrometer was used as an express analyzer of metals and alloys, with the help of which experimental data on the composition of metal waste of tungsten, nickel and copper were obtained.Results. Based on the conducted studies aimed at X-ray fluorescence analysis of the elemental composition of tungsten, nickel and copper metal waste using the Olympus Delta portable spectrometer, it was found that the samples of the studied metal waste correspond to the following grades of alloys: tungsten rod made of tungsten grade VA; nickel plate made of nickel grade PNK-0T1; copper rod made of copper grade M3r.Conclusion. The results obtained will allow further research on their processing by the method of electroerosive dispersion and reuse in the production of heavy tungsten alloys. Renovation of metal waste, including tungsten, nickel and copper metal waste, will contribute to resource conservation, import substitution and ensuring the technological sovereignty of the Russian Federation.","PeriodicalId":117184,"journal":{"name":"Proceedings of the Southwest State University. Series: Engineering and Technology","volume":" 770","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139617707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Kinetics and Mechanism of Liquid-Phase Interaction of Carbide Steels with a Steel Base","authors":"V. K. Narva, Zh.V. Eremeeva, V. V. Gomzhin, N. I. Volgina","doi":"10.21869/2223-1528-2023-13-4-8-19","DOIUrl":"https://doi.org/10.21869/2223-1528-2023-13-4-8-19","url":null,"abstract":"Resume. To develop a mathematical model of the interaction of a carbide steel coating with a steel base under conditions of the formation of a liquid phase.Methods. The average value of the transition zone was experimentally determined using a PMT-3 device. The size of the transition zone in the carbide steel layer was determined using a MAR-2 X-ray microanalyzer.Results. A mathematical model of the interaction of a carbide steel coating with a steel base under conditions of liquid phase formation has been developed. It is established that the distribution of carbon in the transition zone of the carbide steel layer (δL) and the steel base (δS) is described by an exponential dependence, and the above technique allows to predict the size of the transition zone with high accuracy, which confirms the corollary of the theory that when applying a layer on a base with a lower carbon content, the width of the transition zone will be greater, and the speed of the melting of the base is less. properties of coatings made of carbide steels of various compositions. High adhesion strength of coatings to the substrate after vacuum sintering has been established (for carbide steel of 10% TiC, steel Cr6V3Mo 116 MPa; for carbide steel of 40% TiC, steel Cr6V3Mo 131 MPa; for carbide steel of 40% TiC, steel Cr12Mo 220 MPa), which in combination with their high physical-mechanical properties allow us to recommend the method of plasma spraying of coatings made of carbide steels for the restoration of worn surfaces of parts and tools for various purposes.Conclusion. The developed mathematical model makes it possible to calculate the size of the intermediate layer, as well as the diffusion coefficients of carbon in the liquid phase and in the steel base.","PeriodicalId":117184,"journal":{"name":"Proceedings of the Southwest State University. Series: Engineering and Technology","volume":" 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139616943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Observation of Long-Lived Plasma Formations in a Toroidal air Vortex under Normal Conditions","authors":"A. S. Ivanov","doi":"10.21869/2223-1528-2023-13-4-66-74","DOIUrl":"https://doi.org/10.21869/2223-1528-2023-13-4-66-74","url":null,"abstract":"Purpose. Experimentally investigate the difference between the characteristic lifetime of plasma formations in a stationary and rotating toroidal air volume under normal ambient conditions.Methods. Experimental study of plasmoids was carried out by videotaping with a high-speed camera with subsequent frame-by-frame processing of the recording. Generation of plasmoids was performed by mechanical rupture of the plasma cord of the welding arc in the field of permanent magnets. The creation of toroidal rotation of the plasma formation in air occurs when it passes through a hole in a solid screen. Numerical estimation of mechanical forces acting on ions in the air vortex is performed by order of magnitude using experimental data.Results. Two different in design laboratory installations for observation of plasma formations in air under normal external conditions have been created. The lifetime of such \"long-lived\" plasmoids in air is equal to about two milliseconds, which significantly exceeds the lifetime of a plasma-forming welding arc in the free state under the same conditions. The increase in plasmoid lifetime is considered and explained within the framework of mechanical ideas about spatial separation of heavy and light ions inside the plasma under the action of inertia forces as a result of rotational motion of air. The proposed mechanical model of the phenomenon is obviously simplified and does not take into account diffusion, recombination and other related phenomena, since the main and only difference between the observed \"longlived\" and \"ordinary\" plasmoids lies in the nature of the mechanical motion of the medium.Conclusion: Two experimental setups allowing to generate and observe the behavior of plasma formations with a characteristic lifetime of the order of two milliseconds are created and described. The results of observations indirectly confirm a simple mechanical hypothesis about the connection between the lifetime of a free plasma formation and the rotational motion of the gas inside it.","PeriodicalId":117184,"journal":{"name":"Proceedings of the Southwest State University. Series: Engineering and Technology","volume":" 1246","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139617169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mathematical Methods of Observation of Wave Processes During Deformation of 3D Technology Products","authors":"A. N. Chukanov, N. N. Dobrovolsky, E. V. Tsoi, A. A. Yakovenko","doi":"10.21869/2223-1528-2023-13-4-32-42","DOIUrl":"https://doi.org/10.21869/2223-1528-2023-13-4-32-42","url":null,"abstract":"The purpose of this work is to develop and apply mathematical methods (Fourier interpolation) to fix the presence and evaluation of the mechanisms of wave processes developing in products made of powder stainless and heat-resistant alloys of additive technologies (SLM) during their deformation.Methods. To fix the presence of wave processes of plastic deformation in loaded 3d technology products, samples of powder stainless steel 03X18H12M2 (analog AISI 316L) and powder heat-resistant alloy 08ХN53BMTU (analog Inconel 718), manufactured using SLM technology on a 3d printer SLM280 2.0HL, were used. The samples were subjected to uniaxial stretching (GOST 1497-84) with a constant rate of capture in air at room temperature. The lengths of the marked sections were measured using digital video recording of the loading process of the marked surface of the samples. Graphs of the dependences of local relative deformation along the length of the sample and at selected test moments were constructed. The mathematical substantiation of the existence of the wave character of the fixed functions as periodic was carried out by decomposing them into a Fourier series with subsequent interpolation.Results. It has been experimentally established that in the volume of the studied samples of powder stainless steel type 316L and heat-resistant alloy type Inconel 718, obtained by SLM technology, when they are stretched, there is a multistage character of wave deformation reflecting the development and movement of local micro-volumes of increased plasticity (foci of localized deformation). The Fourier interpolation procedure of a complex of experimentally obtained piecewise linear functions of the dimensions of the marking grid and their local deformations confirmed their apparent periodicity, i.e. the presence of a wave character.Conclusion. The developed technique of fixing and mathematical processing of wave deformation spectra can be used to analyze the changing parameters of the surface marking (rolling grid) of 3d products both along their length and at fixed loading times, as well as when constructing multidimensional dependencies of the marking parameters on the geometry of samples and test time.","PeriodicalId":117184,"journal":{"name":"Proceedings of the Southwest State University. Series: Engineering and Technology","volume":" 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139617135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structure and Properties of Thin Magnetron Films of Cadmium Arsenide on Various Substrates","authors":"А. V. Kochura, Zaw Htet Aung, V. S. Zakhvalinsky, E. Pilyuk, E. P. Kochura, A. Y. Ril, V. M. Emelaynov","doi":"10.21869/2223-1528-2023-13-2-201-221","DOIUrl":"https://doi.org/10.21869/2223-1528-2023-13-2-201-221","url":null,"abstract":"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.","PeriodicalId":117184,"journal":{"name":"Proceedings of the Southwest State University. Series: Engineering and Technology","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126485333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of the Sorption of Phenol with Non-Food Waste Wheat Processing","authors":"O. V. Burykina, Z. S. Konovaltseva, К. V. Volvenkina","doi":"10.21869/2223-1528-2023-13-2-222-234","DOIUrl":"https://doi.org/10.21869/2223-1528-2023-13-2-222-234","url":null,"abstract":"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.","PeriodicalId":117184,"journal":{"name":"Proceedings of the Southwest State University. Series: Engineering and Technology","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131131601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isotherms of the Sorption of Fe2+, Fe3+ Ions by Industrial Waste from Aqueous Solutions","authors":"А. V. Lysenko, Т. A. Molokoedova, Y. Sokolova","doi":"10.21869/2223-1528-2023-13-2-235-249","DOIUrl":"https://doi.org/10.21869/2223-1528-2023-13-2-235-249","url":null,"abstract":"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.","PeriodicalId":117184,"journal":{"name":"Proceedings of the Southwest State University. Series: Engineering and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131134857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}