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    Wyświetlanie 1-4 z 4
    Tytuł:
    Influence of the Electrolyte Type on the Adsorption and Electrokinetic Properties of the Ionic Polyamino Acids – Cr2O3 system
    Autorzy:
    Ostolska, Iwona
    Wiśniewska, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/951402.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Tematy:
    Polyamino acid
    polyaspartic acid
    polylysine
    chromium (III) oxide
    polymer adsorption
    potentiometric titration
    zeta potential
    Opis:
    The influence of a kind of support electrolyte on the ionic polyamino acids adsorption at the chromium (III) oxide – polymer solution interface was investigated. The NaCl and CaCl2 were used as the background electrolytes. In order to determine the effect of the electrolyte, the same value of ionic strength of the test solutions were taken. It was proved that formation of intermolecular and intramolecular complexes in the presence of divalent calcium ions is responsible for essential changes in polymer adsorption. Related to the ionic character of polyamino acid two different adsorption behaviours can be observed. The increase of the ASP adsorption amount in the presence of calcium ions may be explained by formation of complexes between the dissociated carboxylic groups and Ca2+ ions. The opposite situation takes place in the case of polylysine – the application of CaCl2 results in the dramatic decrease in the polymer adsorption caused by blocking the active sites available for LYS macromolecules. In order to make a comprehensive analysis, the zeta potential and surface charge density measurements were performed taking into account the kind of the background electrolyte. The above-mentioned tests were carried out in the absence and presence of the polyamino acid at two different concentrations – 10 and 100 ppm respectively.
    Źródło:
    Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2013, 68, 1-2
    2083-358X
    Pojawia się w:
    Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Activated biocarbons obtained from post-fermentation residue as potential adsorbents of organic pollutants from the liquid chase
    Autorzy:
    Nowicki, Piotr
    Gruszczyńska, Karolina
    Urban, Teresa
    Wiśniewska, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/2146892.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    post-fermentation residue
    activated carbons
    organic dyes adsorption
    electrokinetic properties
    zeta potential
    surface charge density
    Opis:
    A series of new synthetic carbonaceous adsorbents has been prepared via physical and chemical activation of residue of alcoholic fermentation of corn starch. Two different variants of thermal treatment procedure - microwave and conventional heating have been applied for preparing of the activated biocarbons. All the samples under investigation were characterised by elementary analysis, surface area measurements as well as determination of the number of surface functional groups. The electrokinetic properties of examined materials were studied using potentiometric titration and electrophoresis methods, which enabled determination of the surface charge density and zeta potential of activated biocarbon particles. Moreover, sorption properties of the carbonaceous materials towards two organic dyes - methylene blue and malachite green were tested. The final products were activated biocarbons of medium developed surface area ranging from 21 to 879 m2/g, showing acidic character of the surface and various content of surface functional groups. More favourable textural parameters as well as sorption properties toward both organic dyes were revealed by chemically activated samples. The obtained results indicated also considerable effect of adsorbed dye molecules on the structure of electrical double layer formed at the solid/liquid interface.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 2 (Special issue - selected papers conference: Physicochemistry of interfaces - instrumental methods); art. no. 146357
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrokinetic properties of silica-titania mixed oxide particles dispersed in aqueous solution of C.I. Direct Yellow 142 dye – effects of surfactant and electrolyte presence
    Autorzy:
    Chibowski, Stanisław
    Wiśniewska, Małgorzata
    Wawrzkiewicz, Monika
    Hubicki, Zbigniew
    Goncharuk, Olena
    Powiązania:
    https://bibliotekanauki.pl/articles/1450752.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    silica-titania composite
    mixed oxides
    zeta potential
    solid surface charge density
    dye adsorption
    surfactant effect
    Opis:
    The mixed $SiO_2$-$TiO_2$ oxide obtained by the pyrogenic method with the silica:titanium percentage ratio equal to 20:80 (ST80) was used in the experiments. The influence of azo dye C.I. Direct Yellow 142 (DY) adsorption at the mixed oxide-solution interface on the electrokinetic properties of solid particles was studied. To determine solid surface charge density and zeta potential of examined suspensions the potentiometric titration and Doppler laser electrophoresis techniques were applied. The changes in structure of electrical double layer formed on the mixed oxide surface in the dye presence were specified as a function of DY concentration, inorganic salt addition and surfactant introduction. The effects of surfactant type and its concentration were determined. Three surfactants of different ionic character (anionic SDS, cationic CTAB and nonionic Triton X-100) were used in measurements. The obtained electrokinetic characteristics of ST80 mixed oxide dispersed in aqueous solutions with various adsorbate compositions is essential for such suspensions stability.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 6; 6-13
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption and electrokinetic studies of sodalite/lithium/poly(acrylic acid) aqueous system
    Autorzy:
    Wiśniewska, Małgorzata
    Franus, Wojciech
    Fijałkowska, Gracja
    Ostolska, Iwona
    Wójcik, Grzegorz
    Nosal-Wiercińska, Agnieszka
    Gościańska, Joanna
    Powiązania:
    https://bibliotekanauki.pl/articles/1450512.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    sodalite
    zeolite from fly ash
    lithium acquisition
    zeta potential
    solid surface charge density
    poly(acrylic acid) adsorption
    mixed adsorbates
    Opis:
    The synthetic zeolite-sodalite obtained by the hydrothermal conversion of fly ash with aqueous sodium hydroxide was used in the experiments. Its adsorption properties in relation to lithium ions were examined. The effects of: solution pH, presence of polymeric substance – poly(acrylic acid) and order of individual adsorbates addition were determined. To specify the binding mechanism of lithium ions on the sodalite surface, besides adsorption experiments, the measurements leading to the solid surface charge density and zeta potential determination, were performed. As a result, the structure of mixed adsorption layer composed of polymer+metal complexes was characterized. The presented study concerns two important issues: management of environmentally harmful wastes such as coal combustion products as well as searching for new sources of lithium and effective methods of its acquisition.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 6; 158-166
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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