Environmental Problems

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Subject: search.filters.subject.activated carbon

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    The investigation of the porous structure of carbon sorbents based on β-cyclodextrin for use in environmental protection technologies
    (Видавництво Львівської політехніки, 2023-02-28) Bordun, Ihor; Malovanyy, Myroslav; Szymczykiewicz, Ewelina; Czestochowa University of Technology; Lviv Polytechnic National University
    In this paper, the porous structure of three types of β-cyclodextrin (β-CD) carbons was synthesized and investigated. The first carbon was obtained from pure β-CD, the second carbon was synthesized from β-CD using the KOH activator, and the third carbon was synthesized from pure β-CD with additional ultrasonic treatment in the non-cavitation mode at the last stage. It was found that the carbon from pure β-CD has a micromesoporous structure with a small specific surface area (~35 m2/g). Activation with KOH causes a significant increase in the specific surface area (~654 m2/g) due to an increase in the content of micropores with an average size of 1,25 nm. The ultrasonic treatment causes mechanical grinding and oxidation of the carbon surface. It has been shown that such treatment increases the mesopore content and significantly changes the mesopore size distribution. It has been established that the oxidation of the β-CD carbon surface after ultrasonic treatment causes an increase in its hydrophilicity of up to 83,1%. The increase in hydrophilicity will allow more efficient use of synthesized carbon and composites based on it in solving the problems of environmental safety in water environments.
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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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    Utilization of sugar beet pulp by getting activated carbon
    (Publishing House of Lviv Polytechnic National University, 2017) Bordun, Igor; Ptashnyk, Vadym; Sadova, Maria; Chapovska, Roksolana; Lviv Polytechnic National University; Lviv National Agrarian University
    The formation and properties of sugar beet pulp have been analysed in the article. It has been proposed to use it as raw material to produce activated carbon. A better hydrophilicity of the obtained carbon in comparison with the samples of industrial production has been shown. Structural features and a porous structure of carbon made of sugar beet pulp have been analysed by X-ray diffraction and small angle scattering methods. It has been found that pores with average radii of inertia of 3.5 nm make the main contribution to the pore structure.