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Wyszukujesz frazę "adsorption properties" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Characteristics of natural and synthetic molecular sieves and study of their interactions with fragrance compounds
    Autorzy:
    Kasperkowiak, M.
    Strzemiecka, B.
    Voelkel, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/110548.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    molecular sieves
    fragrance compounds
    adsorption properties
    thermodynamic parameters
    thermal stability
    Opis:
    Structural, physicochemical and adsorption properties of two natural and one synthetic molecular sieves were investigated by various techniques: X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, low-temperature nitrogen adsorption and inverse gas chromatography. The influence of these properties on the ability to adsorb two model fragrances: p-cymene and menthol was studied. The free enthalpy, entropy and Gibbs free energy of adsorption of fragrance molecules on the surface of zeolite and zeolite-like materials were estimated by using inverse gas chromatography. Also, the influence of temperature on the stability of solid-fragrance compound systems as well as the release of the adsorbed fragrance compounds was studied. The obtained results exhibit that both porosity and chemical composition of molecular sieves influence the size and strength of adsorption of fragrance compounds. The study indicated different release characteristics for p-cymene and menthol.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 2; 789-802
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Co(II) ions adsorption in the hydroxyapatite/aqueous NaClO4 solution system on particles electrokinetics
    Autorzy:
    Janusz, W.
    Skwarek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/110335.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    hydroxyapatite
    adsorption Co(II)
    electrokinetic properties
    Opis:
    The study of the kinetics and statics of cobalt adsorption at the hydroxyapatite/electrolyte interface using radioactive isotope 60Co was conducted. The course of adsorption kinetics indicates that at the beginning adsorption proceeds quickly and then slowly. Such adsorption kinetics is best described by a multiexpotential equation. The analysis of cobalt adsorption as a function of pH and the results of H+ ions desorption/adsorption confirmed that cobalt adsorption proceeds due to ion exchange with calcium ions in the crystal lattice and hydrogen ions in the surface groups of hydroxyapatite. Cobalt ions adsorption results in the increase of the electrokinetic potential but for the solution of the initial concentration of 0.001 mol/dm3 at pH = 8.17 a reversal of the charge due to overloading of the compact layer (edl) is observed.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 1; 31-39
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption behavior of Zn(II) onto natural minerals in wastewater. A comparative study of bentonite and kaolinite
    Autorzy:
    Chai, W.
    Huang, Y.
    Su, S.
    Han, G.
    Liu, J.
    Cao, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/109926.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    adsorption
    Zn(II)
    wastewater
    clay minerals
    structural properties
    Opis:
    In order to remove the harmful metal ions in lead-zinc mineral processing wastewater, two natural clay minerals (bentonite and kaolin) were used as adsorbents and Zn(II) ions were the emphasis in this work. The adsorption behaviors including kinetics and isotherms were investigated by batch experiments. In addition, the adsorption mechanisms were studied by means of zeta potential testing, optical microscope and XRD analysis. The results show that the adsorption process can be best described as the pseudo-second order kinetic model. The adsorption equilibrium data of bentonite and kaolinite can be respectively fitted best by Langmuir and Freundlich models. Thermodynamic studies display that the adsorption of Zn(II) onto clays is non-spontaneous and endothermic. The maximum capacity of Zn(II) adsorbed on bentonite and kaolinite respectively reaches to 79.2 mg·g-1 and 6.35 mg·g-1 at 25 °C. The structural differences of bentonite and kaolinite result in the differences in adsorption behavior and mechanism. The interaction mechanisms of Zn(II) with bentonite and kaolinite involve electrostatic attraction, cation exchange, surface complex and precipitation. Bentonite as adsorbent has the potential to remove Zn2+ better than kaolinite.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 1; 264-278
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Activated biocarbons obtained from lignocellulosic precursors as potential adsorbents of ammonia
    Autorzy:
    Jedynak, Katarzyna
    Charmas, Barbara
    Powiązania:
    https://bibliotekanauki.pl/articles/24085696.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    activated biocarbon
    various carbon precursors
    physical activation
    physicochemical properties
    ammonia adsorption
    Opis:
    The investigated materials were new biocarbons: FC (Fir Cone), FS (Fir Sawdust), FB (Fir Bark), BS (Birch Sawdust), BB (Birch Bark), AS (Acacia Sawdust), AB (Acacia Bark), OS (Oak Sawdust), OB (Oak Bark), HS (Hornbeam Sawdust)) obtained via pyrolysis and CO2 activation of wood waste (lignocellulosic biomass). In order to study the influence of the carbon precursor on the physicochemical properties of biocarbons there were used the precursors: cones, sawdust, and bark of various tree species. The obtained adsorbents were characterized based on the results, of the N2 adsorption, scanning electron microscopy (SEM), elemental analysis (CHNS), thermogravimetry (TG), derivative thermogravimetry (DTG), and differential thermal analysis (DTA), Fourier Transform Infrared Spectroscopy FT-IR (ATR) and the Boehm’s titration method as well as pHpzc (the point of zero charge). The adsorption capacity and the temperature-programmed desorption (TPD) of ammonia were also studied. The obtained activated biocarbons were characterized by the large specific surface area (515 to 1286 m2/g) and the total pore volume (0.27 to 0.46 cm3/g) as well as the well-developed microporous structure (76 - 90%). The maximum NH3 adsorption capacity of the activated biocarbon was determined to be 2.93 mmol/g (FC (Fir Cone)). These results prove that the lignocellulosic precursors are appropriate for preparation of environmentally friendly and cost-effective biocarbons.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 4; art. no. 169835
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    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
      Wyświetlanie 1-5 z 5

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