Вісники та науково-технічні збірники, журнали
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Item Static regulations of urea (carbamide) adsorption by wet and dried peat(Видавництво Львівської політехніки, 2023-02-28) Matsuska, Oksana; Sukhorska, Olga; Gumnitsky, Jaroslaw; Sabadash, Vira; Lviv Polytechnic National UniversityThe possibility and effectiveness of using a natural sorbent – peat from the Vereshchytsia-Yanivske deposit for treating agricultural wastewater with a high urea content – has been studied. The humidity and moisture content of the upland and lowland types of peat from this peatland were determined. Comparing these indicators made it possible to establish that the lowland peat has a significantly higher humidity and moisture content. The adsorption capacities of wet and dried types of peat for urea were studied and compared. The changes in urea concentration in aqueous solutions of the studied peat samples are presented by the corresponding curves. It was established that the lowland peat (dried samples) has higher sorption properties to urea when absorbed from the water environment than the upland type. In the adsorption of non-dried peat, curves were obtained, which show a gradual decrease in the concentration of urea in the solution, indicating the gradual filling of the active centres of peat with urea molecules. For pre-dried peat, rapid absorption of this pollutant is observed at the initial moments (approximately up to 10 minutes). The calculated maximum absorption capacities of dried peat species for urea show that the maximum absorption capacity of dry lowland peat is significantly higher than that of dry upland peat.Item Statics of adsorption of anionic surfactants(Видавництво Львівської політехніки, 2022-03-01) Sabadash, Vira; Konovalov, Oleh; Nowik-Zając, Anna; Lviv Polytechnic National University; Academy of Jan Dlugosz in CzestochowThe paper presents the results of the study of the statics of adsorption of surface-active substances from model solutions by activated carbon and zeolite. The results of photometric determination of the concentration of anionic surfactants before and after adsorption are presented. The results of adsorption capacity calculations are presented. The experimental results using the program (Langmuir 1.03) were numerically calculated. Sorption isotherms of sodium dodecyl sulfate indicate the mechanism of monomolecular physical adsorption. A good convergence of experimental data and theoretical calculations were established, the coefficient of determination R2>0.9, the value of the Chebyshev criterion 9·10-4... 2·10-4, and the root mean square deviation equal to 0 were established.Item Investigation of the process of ammonium ion adsorption by natural and synthetic sorbents by methods of multidimensional cluster analysis(Видавництво Львівської політехніки, 2020-02-10) Sabadash, Vira; Gumnitsky, Yaroslav; Liuta, Oksana; Lviv Polytechnic National UniversityThe results of the research of the adsorption capacity of a number of sorbents of natural and synthetic origin for ammonium ions have been clustered. The natural zeolite of the Sokyrnytsia deposit, a synthetic sorbent based on the fly ash of Dobrotvir state district heat power plant, Al2O3, SiO2, as well as some types of soil: sandy soil, black soil, and clay were used in the research. Equations describing the regularities of adsorption processes depending on the type of sorbent were obtained. According to the obtained dendrograms, two main clusters of sorbents were identified. The statistical parameters of the process and the significance of the obtained results were calculated. The coefficient of determination of the experimental data was 0.67–0.99, the standard deviation was 0.017–0.026.Item Concurrent sorption of Copper and Chromium cations by natural zeolite(Publishing House of Lviv Polytechnic National University, 2017) Sabadash, Vira; Gumnytskyy, Jaroslav; Mylianyk, Oksana; Romaniuk, Liliana; Lviv Polytechnic National University; Ecological Agricultural University College of LvivThe aim of this work was to study the process of adsorption of Copper and Chromium cations by natural zeolites in static conditions. The change of the chemical composition of the surface of the zeolite as a result of sorption of heavy metals was investigated. The influence of the type of the ions and pH selectivity in absorption of heavy metals removal by zeolite was analysed. The reasons for the selective extraction of Copper from two-component solution were explained.