Journal articles: 'Sorption purification'

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Malyovannyi, Myroslav, Galina Sakalova, Natalia Chornomaz, and Oleh Nahurskyy. "Water Sorption Purification from Ammonium Pollution." Chemistry & Chemical Technology 7, no. 3 (September 25, 2013): 355–58. http://dx.doi.org/10.23939/chcht07.03.355.

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Voronov, A. A., S. V. Maksimova, and E. Yu Osipova. "Purification of urbanized melt water with plant sorbents." Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta. JOURNAL of Construction and Architecture 23, no. 2 (April 30, 2021): 105–17. http://dx.doi.org/10.31675/1607-1859-2021-23-2-105-117.

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The article deals with the problem of purification of melt water generated by the urbanized territories. It is proposed to use wood residue from sawing of plantings to obtain relatively inexpensive sorption material for the contamination extraction from surface wastewater. The aim of this work is to study the sorption properties of the material obtained by sawing of plantings. Experimental modeling of sorption of dissolved petroleum products and copper ions from an aqueous solution of milled branches of black poplar is carried out under static conditions. The sorption process is studied in accordance with a three-factor design experiment. Laboratory modeling determines the optimum parameters of water purification and the degree of mutual influence of contaminants on the sorption process. Natural material obtained from the poplar components shows the sorption properties in relation to oil products and copper ions in the water environment. The filters made of milled branches and used in local treatment plants will allow solving the problems of municipal services, namely utilization of wood residue from sawing of plantings and effective melt water purification due to the low-cost filtering materials.

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Siziakova, Ekaterina, Pavel Ivanov, and Regina Maximova. "Feasibility of Applying Alkaline-Earth Metal Carboaluminates for Bayer Process Aluminate Solution Purification from Organic Impurities." Materials Science Forum 1031 (May 2021): 109–16. http://dx.doi.org/10.4028/www.scientific.net/msf.1031.109.

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The article is devoted to the problems of aluminate solutions sorption purification from harmful organic impurities in the production of alumina from the Bayer experiment. The study of sorption of basic classes of organic impurities isolated from industrial aluminate solutions showed that magnesium and calcium hydrocarboaluminates have a high selectivity in relation to the most harmful classes of organic substances for the process. The results of the sorption process kinetics and thermodynamics studies are given, optimal technological parameters of sorption purification and conditions for the synthesis of active sorbents from alkaline aluminate solutions and activated magnesium and calcium raw materials are determined.

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Fomenko, A. I., and L. I. Sokolov. "Use of Ashes from Thermal Power Plants for Effluents Treatment." Ecology and Industry of Russia 26, no. 1 (January 12, 2022): 14–18. http://dx.doi.org/10.18412/1816-0395-2022-1-14-18.

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The results of the aqueous liquids purification by sorption from various impurities by using ashes as sorbent resulting from the solid-fuel combustion (wood processing waste, coal) are presented. Sorption kinetic dependences have been studied, sorption characteristics of concerned ash samples relative to iron and phosphate counter-ions in aqueous liquids have been determined. Purification and sorption capacity values of concerned ash samples relative to ions extracted from aqueous liquids have been calculated. High efficiency of iron ion extraction from aqueous liquids by bypassing-products wihout any additional reagent has been discovered. Wood ash is a promising sorbent for phosphate ions.

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Lodins, Edmunds, Inga Pudze, Ineta Rozenstrauha, and Linda Krage. "Use of Industrial Waste and Raw Materials in Iron Sorption." Key Engineering Materials 721 (December 2016): 154–58. http://dx.doi.org/10.4028/www.scientific.net/kem.721.154.

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This work focuses on pellets made by Latvian industrial waste (waste cullet glass, sewage sludge, metallurgical slag and alumina scrap metal processing waste and raw mineral materials (limeless clay) to gain high porosity and water sorptiom. Iron sorption using ceramic pellets is explored more detailed. Physical-chemical properties and microstructure were researched to obtain a deeper understanding of how these qualities affect water purification from iron compounds. Three pellets with different properties were made in this paper : B5, A5 and E1. Composition B5 indicates highest iron sorption rate at sintering temperature 1100 °C and shows considerable iron reduction in a solution after one week.

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Kuznetsova, N. P., R. N. Mishaeva, and L. R. Gudkin. "Sorption purification of concentrated hemoglobin solutions." Russian Journal of Applied Chemistry 80, no. 9 (September 2007): 1598–603. http://dx.doi.org/10.1134/s1070427207090303.

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Обуздина, Marina Obuzdina, Руш, E. Rush, Шалунц, and L. Shalunc. "Sorption Purification of Effluent Water From Heavy Metal Ions by Modified Natural Zeolites." Safety in Technosphere 6, no. 2 (August 21, 2017): 56–61. http://dx.doi.org/10.12737/article_598d7af88ce043.55438902.

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Features of sorption method of effluent water purification are considered. Analysis of technologies of effluent water purification from heavy metalsionsis presented. Physico-chemical regularities of sorption of Zn, Ni, Cu ions are investigated. As sorbents it is proposed to use zeolites of Holinsky deposits, modified by sulfur polymer, obtained from waste of epichlorohydrin production. This will allow simultaneously solving two problems: elimination of waste and wastewater purification, which is significantly advantageous from the economic point of view. Kinetic curves of sorption of Zn, Ni, Cu ions in different solution concentrations are presented. Also the adsorption process of heavy metal ions from solutions of chemically modified zeolites in the evaluation of the influence of various factors (the contact time of sorbent with solution, pH and temperature) are investigated.

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Rusdiarso, Bambang, Rahmat Basuki, and Sri Juari Santosa. "Evaluation of Lagergren Kinetics Equation by Using Novel Kinetics Expression of Sorption of Zn²⁺ onto Horse Dung Humic Acid (HD-HA)." Indonesian Journal of Chemistry 16, no. 3 (March 12, 2018): 338. http://dx.doi.org/10.22146/ijc.21151.

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Extraction and purification of humic acid from dry horse dung powder (HD-HA) was performed successfully and the purified HD-HA was then applied as sorbent to adsorb Zn2+. Extraction and purification were performed based on procedure of Stevenson (1994) under atmospheric air. Parameters investigated in this work consist of effect of medium sorption acidity, sorption rate (ka) and desorption rate constant (kd), Langmuir (monolayer) and Freundlich (multilayer) sorption capacities, and energy (E) of sorption. The ka and kd were determined according to the kinetic model of second order sorption reaching equilibrium, monolayer sorption capacity (b) and energy (E) were determined according to Langmuir isotherm model, and multilayer sorption capacity (B) was determined based on Freundlich isotherm model. Sorption of Zn2+ on purified HD-HA was maximum at pH 5.0. The novel kinetic expression resulted from proposed kinetic model has been shown to be more applicable than the commonly known Lagergren equation obtained from the pseudo-first order sorption model. The application of the equation revealed that the intercept of Lagergren equation, ln qe was more complex function of initial concentration of Zn2+ (a), Langmuir sorption capacity (b), and sorbed Zn2+ at equilibrium (xe).

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Grachek, V. I., A. A. Shunkevich, A. P. Polikarpov, and O. I. Isakovich. "Sorption properties of new fibrous chelate ion exchanger." Proceedings of the National Academy of Sciences of Belarus, Chemical Series 56, no. 2 (June 7, 2020): 206–11. http://dx.doi.org/10.29235/1561-8331-2020-56-2-206-211.

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The sorption properties of new iminodiacetate fibrous cation exchanger FIBAN XC-1 synthesized on a chemically resistant matrix of polypropylene fiber with a grafted copolymer of styrene and divinylbenzene, which can withstand elevated temperatures and aggressive environments, were studied. It was shown that the fibrous chelate ion exchanger FIBAN XC-1 is an effective sorbent of heavy and non-ferrous metals from multi-ionic aqueous solutions under static and dynamic conditions. It was found that the cation exchanger operates at high speeds up to 20 column volumes / min in water purification from copper and lead ions (purification from Cu2+ – 82 % and purification from Pb2+– 65 %). It was found that the fibrous chelate ion exchanger FIBAN XC-1 is easily regenerated and does not lose its sorption and mechanical properties in the sorption– regeneration cycles.

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Umirova, Nilufar. "Use of glauconite as a non-reagent sorbent for the softening of drinking and boiler waters, industrial waste water." E3S Web of Conferences 216 (2020): 01147. http://dx.doi.org/10.1051/e3sconf/202021601147.

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The article discusses the sorption of purification of water bodies from impurities using natural inorganic sorbents. The availability and low cost of minerals are an important economic advantage of their use for the purification of all types of water. The article describes a method of using an effective sorbent with high ion-exchange and sorption properties for purification of light oil products, for the purification of drinking or industrial water with a high content of heave technogenic metal ions and organic substances. Based on the data obtained, conclusions are drawn about the possibility of using the studied natural mineral sorbents for the extraction of impurities from waste and natural waters.

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Chuntonov, Konstantin, and Man Kyu Lee. "Mechanochemical Sorption Apparatuses." Advanced Materials Research 875-877 (February 2014): 1106–10. http://dx.doi.org/10.4028/www.scientific.net/amr.875-877.1106.

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A new method of sorbent activation by its mechanical grinding directly in the purified gas medium promises a technological breakthrough in the field of manufacturing and using of high purity gases. Simple design solutions and using reactive alloys as a sorbent allow making the gas purification process controllable and reducing the cost of this process by many times as well as reducing the concentration of the impurity in the end product.

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Lamskova, M. I., M. I. Filimonov, A. E. Novikov, and A. I. Novikov. "Sorption filtration of organic microdrops in a hydrocyclone." IOP Conference Series: Earth and Environmental Science 1010, no. 1 (April 1, 2022): 012114. http://dx.doi.org/10.1088/1755-1315/1010/1/012114.

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Abstract It is developed a construction of a hydrocyclone with sorption filter elements, providing effective purification of irrigation water from mechanical impurities and microdrops of organic pollutants. Increasing the efficiency of water purification from various types impurities is achieved due to a larger working area of the sorption filter, varying the structure of the sorption filter by changing the number of filter layers and the distance between the layers depending on the organic pollutants nature, increasing the resource of the sorption filter and reducing the downtime of the hydrocyclone for regeneration with replacement of the sorption filter with a replaceable one. The geometric parameters of the designed hydrocyclone have been determined by the calculation method for capacity 3.5 m3/h: D = 100 mm, din = 32 mm and ddrain = 40 mm. As a sorbing material, it was adopted a carbon fiber sorbent made of viscose technical thread with carbonation, the total sorption capacity of which was 20.9 g/g.

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Cheremisina, Olga, Tatiana Litvinova, Vasiliy Sergeev, Maria Ponomareva, and Julia Mashukova. "Application of the Organic Waste-Based Sorbent for the Purification of Aqueous Solutions." Water 13, no. 21 (November 4, 2021): 3101. http://dx.doi.org/10.3390/w13213101.

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The effective purification of large-capacity wastewater from heavy non-ferrous metals and organic pollutants using inexpensive sorption technology remains a crucial task. Analyzing the current objectives of sustainable development, biochar obtained from chicken manure has prospects as a source for sorption purification of industrial wastewater. To determine the characteristics of organic material and the composition of the initial and equilibrium phases, the following analysis methods were used: volumetric, complexometric, pH-metric, X-ray fluorescence, chromatographic, spectrophotometric, luminescence-photometric and X-ray diffraction. The thermal nitrogen desorption method was used for determining the specific surface area and pore sizes with the Quantachrome Nova 1000e automatic analyzer. The sorption properties of the reprocessing product of the fresh poultry manure were investigated in relation to organic and inorganic compounds: phenols, benzene, ketones, cations of lead, mercury, manganese and iron. Based on the results obtained, technical conditions were developed for the use of the reprocessed organic waste-based product as a sorption material for household, industrial and technological wastewater purification from organic and inorganic components.

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Lakevics, Vitalijs, Janis Locs, Dagnija Loca, Valentina Stepanova, Liga Berzina-Cimdina, and Juris Pelss. "Bioceramic Hydroxyapatite Granules for Purification of Biotechnological Products." Advanced Materials Research 284-286 (July 2011): 1764–69. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.1764.

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Sorption experiments of bovine serum albumin (BSA) on hydroxyapatite (HAp) ceramic granules, prepared at three temperatures 900°C, 1000°C and 1150°C were performed at room temperature 18,6 °C and phosphate buffer, pH 5,83; 6.38 and 7,39. Thermal treatment contributed to the decrease of bovine serum albumin immobilization indicating that sorption process depended on HAp ceramics specific surface area and pH values of phosphate buffer solution. However, it was confirmed that granule size was also an important parameter for bovine serum albumin adsorption. As a result of these experiments, the most appropriate adsorption conditions and phosphate buffer pH values influence on to BSA sorption were analyzed.

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Kotova, N. V., A. V. Kovaneva, S. V. Kholodaeva, and T. A. Pyatiizbyantsev. "WAYS TO IMPROVE THE TRADITIONAL COCARBOXYLASE SORPTION PURIFICATION TECHNOLOGY." http://eng.biomos.ru/conference/articles.htm 1, no. 19 (2021): 189–91. http://dx.doi.org/10.37747/2312-640x-2021-19-189-191.

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This work presents the results of experiments of cocarboxylase sorption from a model solution on sorbents of various structures under static and dynamic conditions. The sorbent was selected for the development of a sorption-chromatographic method for the isolation of cocarboxylase from a mixture of thiamine esters.

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JUSSIPBEKOV, U. Zh, R. M. CHERNYAKOVA, A. A. АGATAYEVA, N. N. KOZHABEKOVA, R. А. KAIYNBAYEVA, and G. Sh SULTANBAYEVA. "SORPTION OF HEAVY METAL CATIONS FROM A WATER-SALT SYSTEMBY NATURAL MONTMORILLONITE." Chemical Journal of Kazakhstan 73, no. 1 (March 14, 2021): 204–12. http://dx.doi.org/10.51580/2021-1/2710-1185.22.

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The sorption properties of natural montmorillonite from the Tagan deposit with respect to heavy metal cations were researched on the model system "Mn2+–Co2+– Ni2+–V4+–H2O–montmorillonite". The influence of temperature, duration of the process and concentration of solutions, as well as the norm of the sorbent on the degree of sorption of cations is considered. The optimal conditions for the sorption process (25о С, 30 min, Т:Ж = 1,5:100) have been determined, at which the degree of solution purification is up to 86.36% cations of Co2+, 85.59% of Ni2+, 82.64% of Mn2+ and 52.29% of V4+. The nature of the sorption curves is determined by the nature of the sorbed cation. According to the absorption efficiency of natural montmorillonite, ions are arranged in the following order: Ni2+≥ Co2+> Mn2+> V4+. The results of the conducted studies indicate the possibility of effective use of bentonite clays of the Tagan field in the purification of wastewater from heavy metal cations

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Lebedeva, Irina, Tatiana M. Lonzinger, and Vadim A. Skotnikov. "Study of Sorption of Manganese (II) Cations by Composite Sorbent." Materials Science Forum 989 (May 2020): 85–90. http://dx.doi.org/10.4028/www.scientific.net/msf.989.85.

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A significant increase in the amount of pollution (including heavy metals) that enter the hydrosphere as a result of human activity, sanitary requirements that are imposed on the quality of water, lead to the search for effective ways and methods of its purification. Wastewater from many industrial plants contain heavy metal salts, including manganese compounds. The sorption of manganese (II) cations by a composite sorbent from model solutions under static conditions was studied, to determine the possibility of using this sorption material in wastewater treatment. The characteristics of the sorption capacity of the composite sorbent are determined. It was established that the static exchange capacity of the composite sorbent is 0.9 mg/g; distribution coefficient - 47.34 l/g; the degree of purification of the solution is 99.9%. The empirical sorption equations for the manganese (II) cation are found, the sorption isotherms are constructed. It is established that the sorption process is described by the Freundlich equation. Experiments have shown that the composite sorbent is effective in extracting manganese (II) from aqueous solutions. Experimental data suggest that the sorbent studied can be used to clean industrial wastewater from manganese compounds.

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Malyshkina, E. S., E. I. Vyalkova, and E. Yu Osipova. "WATER PURIFICATION WITH NATURAL SORBENTS." Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta. JOURNAL of Construction and Architecture, no. 1 (February 27, 2019): 188–200. http://dx.doi.org/10.31675/1607-1859-2019-21-1-188-200.

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Industrial waste can be considered as technological and economical raw materials in related industries, and their disposal in compliance with environmental legislation can be environmentally efficient. Nowadays, researchers search for an effective but relatively cheap absorption material to extract various contaminants from water. Of great greatest interest are the industrial waste that can be used in wastewater treatment technology as a secondary raw material. As a rule, active coals are used in drinking water systems and deep wastewater treatment. In the Tyumen region, this type of sorbent is quite expensive, since there are no natural coal deposits. The sawdust sorbent is proposed to applied as fuel briquettes. The sorption properties of the modified pine sawdust in relation to oil products are studied herein. The correlation analysis is carried out for each type of sorbent exposure. The solution regression and correlation coefficients are calculated. The obtained equations of regression are used to construct absorption isotherms characterizing the dependence of sorption capacity on the concentration of petroleum products in the solution. The sorption activity of sawdust increases by 1.4–4 times depending on the type of modification and intensification. It is shown that the total exchange capacity of pine sawdust on the model solution is only 19.4% lower than the that of activated carbon, which is very expensive for the Tyumen region. In the case of sawdust used for water purification, two environmental problems are solved simultaneously: cheap and effective cleaning of oil-saturated surface runoff and recycling of wood waste.

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Gerliga, V., V. Kravchenko, I. Prityka, and Hussam Ghanem. "Purification of Aqueous Solutions from Salts and Radionuclides." Nuclear and Radiation Safety, no. 1(77) (February 19, 2018): 47–51. http://dx.doi.org/10.32918/nrs.2018.1(77).07.

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The paper presents the technology of industrial waste purification based on the use of natural mineral bentonite sorbent with a large specific surface area, achieved by a cavitation crushing method, partially up to nanosize particles. The possibility for the purification of liquid radioactive waste (LRW) is shown by the example of floor drains with a significant content of salts, as well as organic mineral oils and surface-active substances. In addition to sorption of radionuclides, the used nanostructured sorbent has the ability to sorb heavy metals, salts, borates. The proposed technology contains several stages: ultrasonic treatment of ozonized LRW with the addition of sorbent; centrifugation or precipitation of the resulting mixture; obtaining a sorption-crystalline precipitate and condensate by evaporation. The final stage of processing — evaporation and vitrification in detail in this paper are not considered. The research presents the method of purification of actual LRW solutions for subsequent treatment with sorption-crystalline concentrate for vitrification. Coefficient of activity decrease equals to 103. The cost of technology is negligible, because it is based on the use of cheap bentonite. The proposed method can be used also for cleaning general industrial waste.

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Stepova, K., L. Sysa, and I. Vintonyk. "PURIFICATION OF FE3+ CONTAINING WASTEWATER USING NATURAL SORBENTS." Bulletin of Lviv State University of Life Safety 20 (January 24, 2020): 101–5. http://dx.doi.org/10.32447/20784643.20.2019.15.

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Abstract. Bentonites in natural or activated forms, i.e. after chemical treatment with acids, have high adsorption properties and are widely used as a natural adsorbent. The increase in the adsorption capacity of bentonite sorbents during heat treatment at 100–200 ° C is caused by the removal of adsorbed and chemical water that leads to an increase in the overall porosity. By thermal and hydrothermal treatments, the properties of natural sorbents can be varied within wide limits, giving them selectivity with respect to certain dissolved substances. It is known that the irradiation of water systems by microwaves leads to their heating, that is, this method of pre-treatment of sorbents combines their hydro-thermal treatment with high-frequency irradiation. The aim of the work is to investigate the process of absorption of iron (III) by bentonite clay under the influence of microwave radiation. The sorption properties of bentonites were studied under static conditions. For comparison purposes, adsorption was performed on natural bentonite under normal conditions without any pre-treatment and under the action of ultra-high-frequency electromagnetic radiation. The Langmuir equation was used to describe the experimental adsorption isotherms. The maximum sorption capacity of the treated sample was found to be 1.66 times higher than that of the untreated one and was 63.7 and 38.3 mg / g, respectively. The sorption equilibrium constant of the irradiated sample is 42% lower than that of the native one. This indicates that the sorption equilibrium under the action of ultra-high frequency radiation comes in 1.7 times faster than under normal conditions. Therefore, compared to the untreated sample, microwave irradiated bentonite has better sorption characteristics for iron (III), so it can be a promising sorbent for the purification of natural and wastewater.

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Busarev, Andrey, Irina Sheshegova, and Liliya Khisameeva. "Study of the processes of the purification of water from surface sources from petroleum products." E3S Web of Conferences 274 (2021): 08007. http://dx.doi.org/10.1051/e3sconf/202127408007.

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Recently, the amount of natural waters contaminated with petroleum products, which enter surface sources together with wastewater, has increased. Therefore, the issues of natural water purification of petroleum products are given great importance. Purification of natural waters from petroleum products is possible by sorption and ultrafiltration methods. Kazan State University of Architecture and Engineering conducted research on the purification of natural waters from petroleum products in adsorption filters using various sorbents, as well as membrane separators with ultrafiltration modules from various manufacturers. As a loading of sorption filters, it is recommended to use activated charcoal as a sorbent that is optimal in terms of price and quality of water purification. The membrane modules manufactured in Europe and the United States, have a high cleaning effect from petroleum products and a sufficiently high productivity. However, they are extremely expensive.

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Yao, C., F. Wang, Z. Cai, and X. Wang. "Aldehyde-functionalized porous nanocellulose for effective removal of heavy metal ions from aqueous solutions." RSC Advances 6, no. 95 (2016): 92648–54. http://dx.doi.org/10.1039/c6ra20598d.

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Zigmontienë, Aušra, and Pranas Baltrënas. "BIOLOGICAL PURIFICATION OF AIR POLLUTED WITH VOLATILE ORGANIC COMPOUNDS BY USING ACTIVE SLUDGE RECIRCULATION." JOURNAL OF ENVIRONMENTAL ENGINEERING AND LANDSCAPE MANAGEMENT 12, no. 2 (June 30, 2004): 45–52. http://dx.doi.org/10.3846/16486897.2004.9636816.

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Various methods for removal of volatile organic compounds (VOC) from the air are applied in the world. Their selection is determined by the efficiency and costs of the method. Biofiltration is a new technology to control environmental pollutants helping to regulate emissions of VOC with unpleasant odours in to the air and working environment. When VOC are to be removed from large volumes of air, equipment of biological purification charged with active sludge is used. Such an equipment has a rather simple structure and efficiency of to 98–99 %. Active sludge as a biocharge has both a high concentration of microorganisms compared to stationary charges and good sorption features. Sorptive capacity changes when a load to active sludge is changed, and this has a negative impact on biochemical decomposition of organic substances and, at the same time, on purification efficiency. Calculation and evaluation of an optimal working mode of the equipment enable to avoid desorption of VOC in the system or to diminish it to a minimal value. In the biological air‐purification equipment sorption of an organic substance on the surface of active sludge is running at the initial stage. An organic substance is decomposed biologically only in the second stage, and oxygen dissolved in the system (in the charge) is used and VOC desorption from the system is blocked. One of the main parameters determining the biological air‐purification process and its intensity is change of the concentration of oxygen dissolved (CDO) in water phase and maintenance of its minimal value after termination of aeration (when the equipment is out of operation for some time). In operating equipment with a biocharge one more important problem is encountered ‐ the lifetime of the charge and its renewal in the equipment to maintain required concentration of the active sludge. The goal of the investigation is evaluation of purification efficiency of the equipment and the sorptive capacity of active sludge (depending on a load), selection of the working mode, uninterrupted biochemical decomposition of organic substances (based on the concentration of dissolved oxygen) when the charge is in its still state, and investigation of its biooxidating properties when a biofilter works with a biologically active charge and with an inactive charge having only sorptive properties.

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Politayeva, N. A., Yu A. Smyatskaya, I. V. Dolbnya, L. S. Kasobov, D. B. Rakhimov, and D. A. Zaripova. "Research of pH influence on sorption properties of sorbents on a basis of residual biomass of microalgae Chlorella sorokiniana and duckweed Lemna minor." E3S Web of Conferences 124 (2019): 01050. http://dx.doi.org/10.1051/e3sconf/201912401050.

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This scientific research is determined to a study of sorption process of heavy metal ions removal from aqueous solution at water purification with a help of sorption materials on a basis of residual biomass of microalgae and duckweed. It is known that Chlorella sorokiniana and duckweed Lemna minor have in their composition different valuable substances such as lipids, proteins, pigments, pectic substances. After their extraction residual biomass is formed. And in present study it is proposed for using as biosorbent for water purification. At different pH values the removal of ions of heavy metals (Zn(II), Cd(II), Pb(II), Cu(II)) occurs with varied efficiency; it is an important and informative parameter. Equilibrium and initial concentration of the solution with heavy metal ions were measured by voltammetric method of analysis with a use of special equipment. Chitosan was used as a component for making composite sorption materials with residual biomass of microalgae and duckweed. It is biopolymer which widely used in water purification. Due to this, prepared granules have good sorption properties. Nowadays in the era of technology and wide industrial production it is important and actual to develop new ecological technology and useful materials for water treatment and other fields for environment protection in general.

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Adebayo, O. L., A. A. Adaramodu, M. G. Ajayi, F. E. Olasehinde, and J. G. Oyetunde. "Purification of Nitrate Contaminated Aqueous Solution Using Modified and Unmodified Palmkernel Shell." International Letters of Chemistry, Physics and Astronomy 71 (November 2016): 11–18. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.71.11.

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The adsorption capacity of Palmkernel shell (PKS) which was used as an adsorbent in this study were boosted by acid thermoactivation. The nitrate sorption potential, point zero charge (PZC) and surface area of the PKS were enhanced by the acid thermoactivation process. The process of sorption of nitrate from solution was analyzed using five different isotherm models [Langmuir, Freundlich, Temkin, Harkins-Jura, and Halsey isotherm equations]. The value of the Langmuir monolayer sorption capacity qm [mg/g] increased from 60.12 to 85.73, PZC values increased from 5.50 to 8.40, and the surface area [m2/g] value increased from 29 m2/g to 98 m2/g after the activation process. The effect of pH on the sorption of the nitrate on both sorbents was also considered and it was discovered that the adsorption of nitrate decreases with increase in nitrate solution pH. The effects of the sorbents dose on the sorption process was also studied and the results showed that the amount of nitrate sorbed by both sorbent decreases with increase in sorbent dose.

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Nasyrov, Ilnar A., Dinar D. Fazullin, and Gennady V. Mavrin. "Influence of Particle Size Distribution of Wood Waste Pyrolysis Product on Productivity and Purification Efficiency." Materials Science Forum 1052 (February 3, 2022): 442–47. http://dx.doi.org/10.4028/p-wjs0g7.

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In this paper, studies were carried out on sorption purification under dynamic conditions of a copper (II) ions model solution with sorption material. Sorption material was obtained by low-temperature pyrolysis from wood wastes. Studies were carried out for fractions with particle sizes less than 0.5 mm, 0.5-1 mm, 1-2 mm, 2 and more mm. Test model solution was a polydisperse system with particle sizes from 145 to 224 nm and 6450 to 8640 nm. Particle size of disperse phase of filtrate after passing through sorption material with particle size of 1-2 mm was in the range from 310 to 412 nm and from 2260 to 3300 nm. Peaks of particle size intensity in the filtrate after passing through the sorbent (fraction 1-2 mm) were shifted downward. This indicates that smaller particles remained in the filtrate after purification. This is confirmed by an increase in the sorption rate of copper ions. As the particle size increases, the filtration rate increases, but the efficiency of removing copper ions decreases. The degree of sorption of copper ions from the model solution with an initial concentration of 1028 mg/dm3 was 96.4% for the fraction of the pyrolysis product with a particle size of 1-2 mm, 91.9% - less than 0.5 mm, 91.1% - 0.5-1 mm, 91.7% - more than 2 mm.

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Lyczko, Monika, Barbara Wiaderek, and Aleksander Bilewicz. "Separation of Radionuclides from Spent Decontamination Fluids via Adsorption onto Titanium Dioxide Nanotubes after Photocatalytic Degradation." Nanomaterials 10, no. 8 (August 7, 2020): 1553. http://dx.doi.org/10.3390/nano10081553.

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A one-step process combining the photocatalytic degradation of radionuclide complexes and the adsorption of liberated radionuclides on titanium dioxide nanotubes was developed and tested for the purification of aqueous waste produced from chemical decontamination of nuclear power plant circuit components. Among the tested forms of TiO2, only nanotubes exhibit both high photocatalytic activity and sorption ability, which support their application in a one-step purification process. The obtained results indicate that the photocatalytic degradation of complexes followed by the sorption of the radionuclides onto TiO2 nanotubes offers a promising route for treating spent decontamination fluids.

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Timofeev, Konstantin L., Vasilii Kurdiumov, and Gennady Maltsev. "Sorption and Membrane Technologies for Mine Water Purification." Materials Science Forum 946 (February 2019): 621–27. http://dx.doi.org/10.4028/www.scientific.net/msf.946.621.

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The importance of the research is due to the lack of potable water (~1.6 million m3 per year) in a rapidly developing city in the Urals. One way to solve this problem is to purify water from the spent copper mine with a debit of ~4.4 million m3 of water per year. The most advanced techniques recently used for obtaining drinking water of a high quality are based on ion exchange and reverse osmosis, which can ensure an obtainment of water with initial contents of impurities much below the maximum permissible values. Based on the real experience the article compares sorption and membrane technologies in terms of water purification efficiency and cost of potable water production. The large-scale tests of mine water purification were carried out at sorption and reverse osmosis pilot plants with the capacity of 1 m3 per hour for the incoming flow. The source water had the following composition, mg/dm3: 0.5–0.9 Mn; 1.0–1.7 Ni; 80-140 Ca; 30-40 Na; 40-70 Mg; 0.2–0.6 Cu; 8.1–9.5 Si; 0.01–0.03 Zn; 0.01–1.70 Fe; <0.01 Al; < 0.005 As; < 0.005 Pb. At the same time the salinity was 640–680 mg/dm3, the water hardness was 9.5–11.5 mmol/dm3 and pH was 7.0-7.5. The content of non-mentioned impurities was below the detection limit. The resulting treated water met the requirements for the quality of potable water for both purification techniques. It was concluded, that the best option for treatment of mine water is ion exchange.

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Zhuravlev, Igor. "Sorption Membranes and Filter for Water Purification and Disinfection in Outdoor Conditions." Colloids and Interfaces 3, no. 1 (March 11, 2019): 35. http://dx.doi.org/10.3390/colloids3010035.

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The aim of this article was to develop a simple, cheap, light, highly efficient sorption membrane and filtering device for the purification of naturally polluted water with application in outdoor conditions. Sorption membranes have been prepared from cellulose pulp using paper and pulp technology. The sorbents were introduced into paper pulp as a filler (as activated carbon) or were chemically grafted to cellulose fibers. The absorption ability of such membranes assembled in a filter device has been investigated. The removal of weighted small mechanical particles, microorganisms, dissolved organic contaminants and colloids, and the undesirable ion impurities by the filter was investigated. Using a 10 × 10 cm filter, purification and disinfection of 18 liters of natural polluted water from a lake was done. Purification of dirty water occurs with gravity from a tank (bucket).

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VERGUNOV, Aleksey I. "ORGANIC SORPTION-MEMBRANE TECHNOLOGY OF DON WATERS CLEAN." Urban construction and architecture 6, no. 2 (June 15, 2016): 23–26. http://dx.doi.org/10.17673/vestnik.2016.02.5.

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Within one year on the water of the river Don were conducted pilot tests of bio-sorptional-membrane installation, allowing to reduce the content of organic substances in drinking water. Thus, reducing the efficiency of COD concentration in the bio-sorptional-membrane reactor averaged 44.8%, the chroma - 59.1%, permanganate oxidation - 31.2%. The high degree of water purification has been obtained and turbidity was 95-96%. The results showed that the bio-sorptional membrane technology is a promising way to improve the process of natural water purification, in particular, to prevent the formation of chlorinated and brominated compounds in the chlorination of water.

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Trus, Inna, Mukola Gomelya, Evhen Chuprinov, and Tetiana Pylypenko. "Optimization of dose calculation of modified magnetite during sorption purification of water from copper ions to create environmentally friendly technology." E3S Web of Conferences 280 (2021): 10001. http://dx.doi.org/10.1051/e3sconf/202128010001.

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Due to the growth of man-caused pollution, there is a need to use modern methods of water purification. It is advisable to use sorption methods for the extraction of heavy metals, which are considered to be particularly dangerous. It is established that sorbents based on magnetite are quite effective in the extraction of copper ions. It is shown that the sorption capacity of magnetite-based sorbents towards copper ions depends on the ratio of concentrations of Fe2+ and Fe3+ ions in the reaction mixture, and increases with increasing this indicator from 1/2 to 2. The sorption capacity of the sorbent towards copper ions increases by 4.4 times. It is shown that the efficiency of copper ions removal onto magnetite increases for sorbent modified with sodium sulfide. The proposed scheme provides the possibility of sorption treatment of large volumes of water from copper ions to the norms for the discharge of wastewater into fishery reservoirs. Post-productional magnetite is dehydrated and supplied to metallurgical enterprises for processing. The developed technology of water purification from copper ions is environmentally safe and energy efficient.

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Litynska, Marta, Tetiana Dontsova, Olena Yanushevska, and Volodymyr Tarabaka. "Development of iron-containing sorption materials for water purification from arsenic compounds." Eastern-European Journal of Enterprise Technologies 2, no. 10 (110) (April 30, 2021): 35–42. http://dx.doi.org/10.15587/1729-4061.2021.230216.

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The paper is devoted to the development of a method for obtaining and using iron-containing sorption materials for the effective removal of arsenic compounds of different oxidation states from an aqueous medium. It is known that arsenic compounds have a harmful effect on biota due to high toxicity. The paper theoretically and experimentally substantiates the choice of iron-containing materials as the main sorbent material for arsenic compounds removal from the aqueous medium. A series of iron-containing adsorbents, including powder, activated carbon-based granular and suspension sorbents, was synthesized by different methods (heterogeneous and homogeneous precipitation). Experimental studies have confirmed that the adsorption of arsenate ions on iron-containing sorption materials corresponds to the pseudo-second order of the reaction (R2=0.999), which is inherent in adsorption processes. It was determined that oxyhydroxide sorption materials obtained by the homogeneous precipitation demonstrate higher sorption activity (up to 70 mg/g for As(III) and over 70 mg/g for As(V)). It was found that activated carbon-based iron-containing sorption materials showed approximately 2 times lower efficiency than powder iron(III) oxide, iron(III) oxyhydroxide and amorphous iron(III) hydroxide. It was shown that the use of microfiltration membranes is promising for the removal of spent suspension iron-containing sorption materials. Experimental studies have confirmed that the use of the combination “fine-particle iron(III) oxyhydroxide/membrane” allows removing arsenic compounds from contaminated water to the sanitary requirements level (less than 10 μg As/l) and separating effectively the spent fine-particle sorbent from water

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Mukhortova, L. I., Yu T. Efimov, T. G. Konstantinovа, and V. P. Endyuskin. "Sorption Purification of Sewage from Aromatic Nitro Compounds." Ecology and Industry of Russia 24, no. 5 (May 10, 2020): 21–23. http://dx.doi.org/10.18412/1816-0395-2020-5-21-23.

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The possibility of using activated carbons in wastewater treatment from aromatic nitrophenols and nitrosulfonic acids was investigated. The main parameters of the adsorption process that provide the maximum degree of purification are determined: the amount of activated carbon and the pH of mother solutions. The method of regeneration of the extracted activated carbon by treatment with sodium hydroxide solution was studied, the optimal conditions of extraction were determined.

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Tverdokhlib, M. M., and N. D. Gomelya. "SORPTION-CATALYTIC OF WATER PURIFICATION FROM MANGANESE COMPOUNDS." Scientific notes of Taurida National V.I. Vernadsky University. Series: Technical Sciences 3, no. 2 (2019): 42–46. http://dx.doi.org/10.32838/2663-5941/2019.3-2/08.

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Timofeev, K. L. "Sorption purification of nickel solutions of metal impurities." Bulletin of the South Ural State University Series ‘Metallurgy’ 16, no. 1 (2016): 157–65. http://dx.doi.org/10.14529/met160123.

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Ansone, Linda, Maris Klavins, and Linda Eglite. "Use of peat-based sorbents for removal of arsenic compounds." Open Chemistry 11, no. 6 (June 1, 2013): 988–1000. http://dx.doi.org/10.2478/s11532-013-0229-0.

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AbstractIt is important to apply sorbent materials for purification of water from arsenic contamination due to serious arsenic pollution worldwide. We have developed new sorbents based on natural materials that provide a cheap and environmentally friendly alternative. For the first time, peat modified with iron compounds and iron humates were tested for sorption of arsenic compounds. The highest sorption capacity was found in peat modified with iron compounds. We have found that sorption of different arsenic speciation forms was strongly dependent on solution pH, reaction time and temperature. Calculations of the sorption process using thermodynamic parameters indicate the spontaneity of sorption process and its endothermic nature. Sorption kinetics showed that most arsenates are removed within 2 hours, and the kinetics of arsenate sorption on modified peat can be described by the pseudo-second order mechanism.

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Zhang, Ying, Yu Ling Zhang, Sheng Yu Zhang, Fan Song, Jing Yi Huang, Yan Zhang, and Xiang Dong Bai. "Utilization of Scoria as PRB Reactive Media for the Removal of Petroleum Hydrocarbon from Groundwater." Advanced Materials Research 535-537 (June 2012): 2457–61. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.2457.

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The aim of this study is to investigate the utilization of scoria as PRB reactive media for the removal of petroleum hydrocarbon from groundwater. Tests of comparison of scoria with powdered activated carbon(PAC) show that scoria has a larger capacity for petroleum hydrocarbon sorption than PAC. The particle size has weak effect on purification petroleum contaminated groundwater. The results of isothermal adsorption test show the high sorption capacity of the scoria(1.7g/g for TPH).The acquired sorption data are well fitted to the Langmuir isotherm.Careful examination of scoria’s composition and microstructure suggests that the sorption behavior is not only physical sorption but also chemical sorption,but mainly controlled by physical sorption .We recommend scoria as an economic,efficient and environmental friendly sorbent for petroleum hydrocarbon in contaminated groundwater.

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38

Vezentsev, Alexandr, Natalia Volovicheva, Svetlana Korolkova, Lidiia Peristaya, Vitaliy Milyutin, and Igor Korolkov. "Purification of water and fertile soil with bentonite-like clays of the Belgorod Region." BIO Web of Conferences 30 (2021): 02001. http://dx.doi.org/10.1051/bioconf/20213002001.

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This paper presents the results of a comparative assessment of the effectiveness of sorption purification of aquatic medium and fertile soils using native forms of bentonite clays of deposits in the Belgorod region (Russia) from heavy metal ions (Cu2+, Fe3+, Cr3+, Pb2+) and radionuclides (137Cs, 85Sr, 233U и 239Pu). It was revealed that during the sorption of heavy metal ions (Cu2+, Fe3+ и Cr3+) from model water systems, the most absorbing activity is shown by the natural clays of the Polyana and Nelidovka deposits, which have almost the same ability to absorb heavy metal ions. The purification efficiency of the model aqueous solutions from these cations taken at an initial concentration of 0.1 mmol/l reaches 95%. It was established that the natural clay of the Polyana deposit is also an effective sorbent for the purification of solutions from cesium radionuclides. In terms of sorption ability, the studied sample is 5 times superior to natural clinoptilolite, which is most often used to purify solutions from radiocesium.. It was revealed that with an increase in the amount of added sorbents, the detoxification effect is increased, that is, the content of heavy metals in the green mass decreases.

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Kiryushina, N. Yu, and A. Y. Semeykin. "Optimization of Wastewater Treatment from Cd²⁺ Ions Using Slag of Electric Furnace Steelmaking Production." Solid State Phenomena 284 (October 2018): 795–800. http://dx.doi.org/10.4028/www.scientific.net/ssp.284.795.

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The process of purification of Cd2+ ions from model wastewater by the slag of electric furnace steelmaking process was investigated; the kinetic regularities of the sorption process were studied. During the work on the basis of experimental data taking into account the mass of the additive, the temperature of the reaction mixture, the duration of the contact, a mathematical simulation of the reagent-sorption purification process was carried out. Titrimetric, spectrophotometric, atomic absorption methods of investigation were used in the work, chemical composition of slag was established. The article may be of interest to specialists in the field of obtaining new adsorbents using waste products.

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Kovalchuk, I. A., V. Yu Tobilko, A. I. Bondarieva, Yu M. Kholodko, and B. Yu Kornilovych. "Water purification from heavy metal ions by nano-sized Fe0/kaolinite composites." Reports of the National Academy of Sciences of Ukraine, no. 11 (2020): 96–103. http://dx.doi.org/10.15407/dopovidi2020.11.096.

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We have investigated the physicochemical features of the purification of wastewater that are complex on its content and include a mixture of heavy metal ions (Cu(II), Cd(II), Zn(II), Co(II), Cr(VI)). The phase of a composition and structural-sorption characteristics of synthesized nano-sized Fe0/kaolinite composites were studied. It was found that the obtained materials have much better sorption properties for the extraction of heavy metals from aqueous solutions in comparison with natural kaolinite. Calculations of sorption isotherms according to the Freundlich equation are done. Based on isotherms, the average values of specific sorption per unit of an active surface of the mineral at the content of heavy metal ions in the initial solutions of 300 μmol/dm3 were determined. They range from 0.42 to 17.1 μmol/g for Cr(VI) to Cu(II) ions. It has also been found that similar values for the modified samples are much larger and range from 13.8 to 80.27 μmol/g for ions from Cr(VI) to Cu(II). It is shown that composite sorbents based on nano-sized zero-valent iron and dispersed kaolinite silicate are effective sorbent materials for the purification of water contaminated with toxic heavy metal ions that are commonly found in wastewater of the galvanic and hydrometallurgical industries.

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Myrzalieva, S. K., J. T. Bagasharova, and Sh K. Akilbekova. "Study of the possibility of using zeolite and diatomite in the treatment of oil-contaminated wastewater." Kompleksnoe Ispolʹzovanie Mineralʹnogo syrʹâ/Complex Use of Mineral Resources/Mineraldik Shikisattardy Keshendi Paidalanu 322, no. 3 (May 2, 2022): 33–42. http://dx.doi.org/10.31643/2022/6445.26.

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Numerous harmful substances of anthropogenic origin that are released into the environment, including petroleum products, are the result of the uncontrolled discharge of industrial wastewater into natural water bodies. Operation of oil refining and petrochemical industry enterprises, gaseous emissions and effluents of industrial enterprises, numerous oil and NP spills as a result of accidents and fires at oil storage facilities and oil refineries lead to pollution of water and soil with considerable amounts of crude oil and products of its processing and create a serious threat to the ecology of regions of Kazakhstan. A cardinal solution to the problem of protection of water bodies from pollution by wastewater polluted by oil and NP is to organize such water management of enterprises, under which the system of recycling water supply is developed as much as possible and the discharge of wastewater into water bodies is minimized. Currently, the sorption method of water purification is the most environmentally safe and expedient. When selecting a sorbent for sorption much attention is paid to its sorption characteristics and the availability of raw materials. In addition, the choice of a sorbent depends on such factors as the quality requirement for purification, the condition of pollutants, the stages of purification and others. A wide range of natural sorption materials used in water treatment and water treatment is known. Natural materials based on modified diatomites and zeolites from Kazakhstan deposits are investigated in this work.

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Svyatchenko, A. V., S. V. Sverguzova, Zh A. Sapronova, and I. G. Shaikhiev. "Using Chestnut Leaf Litter in Aqueous Media Purification from Diesel Fuel." Ecology and Industry of Russia 24, no. 8 (August 7, 2020): 46–50. http://dx.doi.org/10.18412/1816-0395-2020-8-46-50.

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For wastewater treatment, native and thermally modified samples of leaf chestnut litter (LCL) were used as sorption material. Studies were carried out to determine the static oil capacity of the sorption material (SM) in relation to the diesel fuel (DF) and water adsorption depending on the particle size. It was established that the oil capacity of chestnut litter depends on the particle size of the biosorption material, the conditions of its heat treatment, and the duration of contact of the SM with the sorbate. It was found that the maximum sorption capacity by DF for LCL250 is 7.17 g/g. It was determined that the purification efficiency of over 95% is achieved with a dosage of LCL250 over 1.0 g/dm3 and a diesel fuel concentration of 210 mg/dm3.

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Fomenko, A. I., and L. I. Sokolov. "Sorption Properties of Fly Ash Microspheres of Thermal Power Plants." Ecology and Industry of Russia 23, no. 1 (January 15, 2019): 50–54. http://dx.doi.org/10.18412/1816-0395-2019-1-50-54.

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The sorption characteristics of aluminosilicate microspheres of fly ash from thermal power plants with respect to heavy metal ions were studied with a view to their subsequent use for integrated treatment of household and industrial wastewater. The mechanism and kinetics of the sorption of total iron ions from aqueous solutions are studied, quantitative characteristics of the sorption capacity and adsorption equilibrium constants are obtained. It has been established that aluminosilicate microspheres of fly ash possess sorption properties with respect to common iron ions. The sorption isotherm of iron ions from water by the material under study is characteristic of microporous sorbents. The quantitative characteristics of the sorption process allow us to conclude about the possibility of using aluminosilicate fly ash microspheres without any additional treatment for the purification of waste water from heavy metal ions.

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Xu, Chenyang, Jinjue Zeng, Xianrui Gu, Yue Wang, Erchun Li, Chen Zhang, Cong Ge, et al. "Porous monolith of few-layered boron nitride for effective water cleanup." Journal of Materials Chemistry A 10, no. 2 (2022): 846–54. http://dx.doi.org/10.1039/d1ta08930g.

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Какимов, Айтбек, Aitbek Kakimov, Жайнагуль Какимова, Zhaynagul Kakimova, Ирина Смирнова, Irina Smirnova, Ерлан Жарыкбасов, and Erlan Zharykbasov. "Promising areas of zeolite application in milk purification from toxic elements." Food Processing: Techniques and Technology 48, no. 1 (January 10, 2019): 143–49. http://dx.doi.org/10.21603/2074-9414-2018-1-143-149.

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The article reveals the data on lead and cadmium content in raw milk samples taken in seven areas located in two districts of Semey Territory of East Kazakhstan Region (Abay and Ayagoz Districts). The authors determined high content of lead (from 0.11 to 0.15 mg/l) in milk samples taken in the populated areas which are located closer to the territory of the former Semipalatinsk Nuclear Test Site. To reduce the content of toxic elements in raw milk the authors developed an experimental filtration unit using natural zeolite brought from Tarbagataysky deposit (East Kazakhstan Region) as sorption-filtering material. Natural zeolite module SiO2/Al2O3 consists of 6.3 units which characterizes it as a high-purity clinoptilolite, highly efficient sorption ion-exchange material. As a result of the experiments the authors determined that natural zeolite taken from Tarbagataysky deposit of East Kazakhstan Region shows sorption properties in relation to lead and cadmium ions. Zeolite application as a sorption-filtering material helps reduce cadmium and lead ion content in milk during filtration. The most suitable processing parameters of milk filtration which help change the content of the considered elements significantly are the following: filtration temperature should be 18–20°C, pump rotation frequency – 300 rpm with filter of the experimental unit which consists of 200 g of natural zeolite. Besides, the authors studied the changes in organoleptic, physical and chemical properties of milk during filtration. The authors determined that organoleptic, physical and chemical properties during milk filtration using natural zeolite as a sorption-filtering material do not change and comply with the regulatory requirements which specify fresh milk quality parameters. Titratable acidity of milk reduces insufficiently.

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Krasnopyorova, AP, IV Khristenko, GD Yuhno, EV Ostapenko, and AS Levishko. "Sorption properties of hybrid organic-silica material towards 137Cs, 90Sr and 90Y radionuclides." Adsorption Science & Technology 36, no. 3-4 (January 1, 2018): 851–56. http://dx.doi.org/10.1177/0263617417747469.

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Hybrid organic-silica material modified by amino groups has been investigated as adsorbent of radionuclides [Formula: see text] and [Formula: see text] from aqueous solutions. The sorption ability of the organic-silica material in the pH range of 2–9 with thermostating is studied by static sorption method. Analysis of sorption kinetic curves of radionuclides for aminoxerogel has shown that sorption equilibrium is established in 3–3.5 h. It is shown that the mechanisms of radionuclides sorption on the organic-silica material are combined by the complex formation and ion-exchange mechanism. The amino containing organic-silica material can be recommended for the cleaning of surfaces and purification of water solutions contaminated with [Formula: see text] and [Formula: see text].

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Shaikhiev, I. G., T. K. T. Nguyen, R. Z. Galimova, and V. O. Dryakhlov. "LEANING THE GALVANIC WASTE WATER OF THE COMPANY «THIEN MY» (VIETNAM) USING SAWDUST AND ION EXCHANGE." Construction economic and environmental management, no. 1 (2020): 36–41. http://dx.doi.org/10.37279/2519-4453-2020-1-36-41.

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The technology for wastewater treatment of galvanic production was developed for «Thien Mi» LLC, Vinh Fuk, Socialist Republic of Vietnam. Initially, a characteristic of the existing method for the extraction of heavy metal ions from electroplating is given. It was revealed that the treatment of wastewater from galvanic plants with a suspension of calcium hydroxide leads to the formation of a large volume of galvanic sludge and an insufficient degree of purification from heavy metal ions. The possibility of sorption purification of the galvanic drains of the named enterprise using the sawdust of acacia (Acacia auriculiformis) as a sorption material was investigated. The adsorption isotherms of Cu2+, Ni2+, and Zn2+ ions with native sawdust of acacia were constructed. Sorption material was processed with weakly concentrated solutions of sulfuric acid, which leads to an increase of more than 4 times in the sorption capacity of the mentioned ITMs. The post-treatment of galvanic solutions from heavy metal ions was carried out using the Lewatit Monoplus TP 207 ion-exchange resin. The toxicity of the initial galvanic drains was investigated after each cleaning step using standard test objects Paramecium caudatum and Daphia magna. As a result of the studies, sorption and ion-exchange methods are recommended for the treatment of wastewater of galvanic production of small volumes, which can significantly reduce the concentration of heavy metal ions in purified solutions.

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Trus, I. M., M. D. Gomelia, T. V. Krysenko, and Ye S. Bulhakov. "STUDY OF THE EFFICIENCY OF WATER PURIFICATION FROM HEAVY METAL IONS WITH MAGNETITE SORBENTS." Energy Technologies & Resource Saving, no. 1 (March 20, 2020): 46–51. http://dx.doi.org/10.33070/etars.1.2020.6.

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The process of water treatment from heavy metal ions on sorbents with magnetic properties was investigated. Samples of magnetite obtained at a ratio of the concentrations of iron (II) ions and iron (III) 1 : 2; 1 : 1 and 2 : 1, and samples modified with sodium sulfide were used. The effect of pH on the sorption efficiency of heavy metal ions on magnetite was studied. It was shown that the sorption capacity of magnetite towards heavy metal ions, as well as the efficiency of water treatment from these compounds, increases with an increase of the [Fe2+]/[Fe3+] ratio from 1 : 2 to 2 : 1. Sorption capacity of magnetite increases with increasing pH due to partial hydrolysis of heavy metal ions. Also sorption capacity of magnetite increases significantly if modified it with guanidine, thiosemicarbazide, and sodium sulfide. At the same time, the sorbent provides a high degree of water purification from heavy metal ions while reducing the metal concentrations to several µg/dm3. Ref. 12, Fig. 5, Tab. 1.

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Kuznetsova, T. S., I. V. Burakova, T. V. Pasko, A. E. Burakov, A. V. Melezhik, E. S. Mkrtchyan, A. V. Babkin, E. A. Neskoromnaya, and A. G. Tkachev. "Technology of obtaining nanocomposites for sorption purification of aqueous media." Perspektivnye Materialy 9 (2021): 68–78. http://dx.doi.org/10.30791/1028-978x-2021-9-68-78.

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The paper presents a technique for obtaining a universal composite nanomaterial for effective sorption water purification from pollutants of various chemical nature. The proposed material is a nanocomposite based on reduced graphene oxide modified with a functional organic component — polyaniline, which also includes oxidized carbon nanotubes as a structure former. The use of polyaniline makes it possible to significantly increase the activity and sorption capacity of the developed graphene material. The authors were developed a number of nanocomposites, which differ in the final stage of the pre-prepared hydrogel technology: drying in air (drying oven), freeze drying, drying under supercritical conditions (supercritical fluid — isopropyl alcohol). In addition, the effect of carbonization as an additional stage (T = 800 °C, argon) was studied in the article. The materials surface morphology was evaluated using scanning electron microscopy. The specific surface area and the parameters of the porous space were determined by nitrogen adsorption. The materials specific surface area increases depending on the choice of drying technology for the initial hydrogel (drying oven — 80 m2/g → freeze drying — 180 m2/g → supercritical drying — 290 m2/g), and also increases after the carbonization stage and reaches a value of ~ 350 m2/g. The nanocomposites sorption capacity to the organic dyes (methylene blue (MB) and solar yellow (SY)), as well as to heavy metals (for example, zinc ions) was determined. It was found that the value of MB sorption is up 1380 to 1800 mg/g, for SY — up 159 to 300 mg/g, for zinc — up 31 to 230 mg/g. At the same time, the sample processed under supercritical conditions, followed by carbonization, were shown the best characteristics.

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Govorova, Zhanna, Ekaterina Muraveva, Yulia Isachkina, and Vadim Govorov. "Technology of surface runoff purification." E3S Web of Conferences 97 (2019): 06019. http://dx.doi.org/10.1051/e3sconf/20199706019.

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Surface runoff from urban area is a potential source of pollution of water bodies. Characteristics of rainfall runoff in some cities of Russia and foreign countries are given in the article. Traditional wastewater treatment facilities include the mechanical removal of large items, debris and leaves; sand removal; water clarification in accumulative clarifying tanks; chemical dosing, contact filtration and deep purification in sorption filters. Four technological schemes were analyzed. Conceptual difference of the schemes is using a new construction of accumulative clarifying tanks and different types of filters with inert floating polysterene load (CFPZ-1, CFPZ (CS), AFPZ-4). The investigation results of pilot plant that simulates the purification process of surface runoff in clarifying, sorption and I and II step cartridge filters are given in the article. During the investigation period the water entering the pilot plant had the concentration of suspended solids – 81-180 mg/L, petroleum products – 2-8 mg/L, COD – 48-97 mg/L. Analysis of the dynamic of changes in the concentration of suspended solids and petroleum products in previously treated in accumulative clarifying tank water during the filter cycle at each step showed that purification efficiency in polystyrene load layer depends on the type and dose of flocculant, filter rate and duration of filtration. The investigation results were used for the development of recommendations for the intensification of operation of industrial filters and improving technological reliability of surface runoff treatment facilities.

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Journal articles on the topic 'Sorption purification'

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