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361 results on '"Wiśniewska, Małgorzata"'

29. Physicochemical and Adsorption Properties of Nanoporous Activated Biocarbons from Thermochemical Treatment of Horsetail Herb.

Author

Wiśniewska, Małgorzata, Nowicki, Piotr, Urban, Teresa, and Gun'ko, Volodymyr M.

Subjects
*CARBON-based materials, *BLOOD proteins, *CARRIER proteins, *SURFACE charges, *ZETA potential
Abstract

In this study, the adsorption characteristics of novel activated biocarbons prepared from horsetail herb (a popular and troublesome weed) by physical activation (using carbon dioxide) and chemical one (using phosphoric(V) acid) in the process of simultaneous proteins immobilization in multicomponent solutions were examined. The carbon materials were characterized in terms of their porous structure, acidic‐basic properties, and surface morphology. The binding mechanisms of such proteins as bovine serum albumin (BSA) and lysozyme (LSZ), differing in internal stability, were determined alone and in their blends. This was done based on the comprehensive analysis of the results of adsorption/desorption, surface, electrokinetic and stability measurements. These experiments were carried out over a wide pH range of 3–11. They included the following issues: (1) determination of the protein adsorbed/desorbed amounts on/from a surface of activated biocarbons; (2) study of the kinetics of these processes; (3) examination of the macromolecules impact on the surface charge density and zeta potential of the carbon materials; and (4) determination of the suspension stability and size of aggregates formed in the examined systems. The analysis of the obtained results indicated the differences in the binding mechanism of both proteins that is of key importance for their simultaneous immobilization on activated biocarbons surface in the soil environment. [ABSTRACT FROM AUTHOR]

Published
2024
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47. Removal of Organic Dyes, Polymers and Surfactants Using Carbonaceous Materials Derived from Walnut Shells.

Author

Wiśniewska, Małgorzata, Urban, Teresa, Tokarska, Karina, Marciniak, Paulina, Giel, Anna, and Nowicki, Piotr

Subjects
*CARBON-based materials, *WATER-soluble polymers, *MOLECULAR size, *POLYMERS, *ETHYLENE glycol, *ORGANIC dyes, *CARBONACEOUS aerosols
Abstract

A series of new granular carbonaceous adsorbents was prepared via single-stage physical and chemical activation of walnut shells. Their suitability for removing various types of organic pollutants (represented by dyes, surfactants and water-soluble polymers) from the liquid phase was assessed. The activation of the precursor was carried out with CO2 and H3PO4 using conventional heating. Activated biocarbons were characterized in terms of chemical composition, acidic–basic nature of the surface, textural and electrokinetic properties as well as thermal stability. Depending on the type of activating agent used during the activation procedure, the obtained biocarbons differed in terms of specific surface area (from 401 to 1361 m2/g) and the type of porous structure produced (microporosity contribution in the range of 45–75%). Adsorption tests proved that the effectiveness of removing organic pollutants from the liquid phase depended to a large extent on the type of prepared adsorbent as well as the chemical nature and the molecular size of the adsorbate used. The chemically activated sample showed greater removal efficiency in relation to all tested pollutants. Its maximum adsorption capacity for methylene blue, poly(acrylic acid), poly(ethylene glycol) and Triton X-100 reached the levels of 247.1, 680.9, 38.5 and 61.8 mg/g, respectively. [ABSTRACT FROM AUTHOR]

Published
2024
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48. Research on Green Adsorbents.

Author

Wiśniewska, Małgorzata and Nowicki, Piotr

Subjects
*SORBENTS, *POLLUTANTS, *MATERIALS science, *NITROGEN oxides, *SUSTAINABILITY, *SOLUBLE glass, *DISSOLVED organic matter
Abstract

"Research on Green Adsorbents" is a document that explores the importance of adsorption processes in applications such as air purification, wastewater treatment, and energy storage. It focuses on the advantages of using environmentally friendly adsorbents derived from natural sources, which offer competitive adsorption parameters at a low cost. The document includes a collection of research papers and reviews that cover various topics, including the adsorption of dyes on clay minerals, the properties of nanocomposite fillers, and the synthesis of zeolites for catalytic performance. It provides a comprehensive overview of recent advancements in the field of green adsorbents and emphasizes the need for further progress in measurement equipment and material characterization. [Extracted from the article]

Published
2024
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