Environmental Problems

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Author: search.filters.author.Sabadash, ViraSubject: search.filters.subject.zeolite

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    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 Czestochow
    The 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.
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    Simulation of ion exchange interaction kinetics in the clinoptylolite – ammonium ion system
    (Видавництво Львівської політехніки, 2021-06-01) Sabadash, Vira; Gumnitsky, Jaroslaw; Omelyanova, Sofia; Lviv Polytechnic National University
    The kinetics of adsorption of ammonium ions under dynamic conditions has been studied. A mathematical model of the process was built. The mass transfer coefficient was calculated depending on the intensity of the change of location. It was established that ion exchange occurs in external and internal diffusion regions. The rate constants of ion exchange for the region of external and internal diffusion were calculated.
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    Complex water treatment of agroindustrial complexes
    (Publishing House of Lviv Polytechnic National University, 2016) Sabadash, Vira; Gumnitsky, Jaroslav; Tyzrbir, Galyna
    The aim of this work was studying the process of phosphate adsorption on natural and synthesized adsorbents such as aluminosilicates. Sorption properties of natural zeolite concerning phosphates in static and dynamic conditions were investigated. It was found that phosphates were absorbed better in an acidic environment. Zeolites based on fly ashes of Dobrotvir heat power plant were synthesized and modified. The equilibrium values of adsorption capacity were established and the proper isotherms at a temperature 20 °C were built.