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    Tytuł:
    Uptake of phosphates from water solutions on metallurgical sludge
    Autorzy:
    Kostura, Bruno
    Huczala, Radim
    Klika, Zdeněk
    Ritz, Michal
    Bartoňová, Lucie
    Matýsek, Dalibor
    Powiązania:
    https://bibliotekanauki.pl/articles/2032862.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    phosphates
    heavy metals
    Langmuir isotherm
    Freundlich isotherm
    fosforany
    metale ciężkie
    izoterma Langmuira
    izoterma Freundlicha
    Opis:
    Steel-making dust slurry (SS) and convertor dust slurry (CS) were tested for uptake of phosphates from aqueous solutions. The adsorption of phosphates on SS and CS corresponded well with both Langmuir and Freundlich adsorption isotherms, which indicated the combination of physical and chemical processes. The maximum adsorbed amount of phosphates on both dust slurry samples was ca. 11 mg P/g. The study evaluates also the effect of acidic leaching on the retention characteristics of both dust slurry samples. From the slurry samples prepared by acidic leaching, the leached convertor dust slurry (CSL) was the only sample capable to retain phosphates. To reveal the retention mechanisms of phosphates, the original and leached dust slurry samples were analyzed by IR and Raman spectroscopy. Co-precipitation of Ca and Fe phosphates, or surface complexation of phosphates were evaluated as the retention mechanisms of CS and CSL while the retention of phosphates by zincite in the case of SS is probably based on their adsorption.
    Źródło:
    Environment Protection Engineering; 2021, 47, 3; 37-51
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ferric hydroxide-based media for removal of toxic arsenic species. Kinetic, equilibrium and thermodynamic studies
    Autorzy:
    Szlachta, M.
    Wójtowicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/207931.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Freundlich isotherm
    Langmuir isotherm
    arsenic
    adsorption
    sewage
    izoterma Freundlicha
    izoterma Langmuira
    arsen
    adsorpcja
    ścieki
    Opis:
    Adsorption studies were conducted to assess the feasibility of ferric hydroxide-based material for treatment of highly arsenic-contaminated effluents. The experiments were performed in a batch adsorption regime using a synthetic aqueous solution. The contact time between arsenic ions and the adsorbent, initial concentration of arsenic in treated solution, temperature of solution and adsorbent dose had a significant effect on the adsorption performance in the system. Both the mechanism of the process involved and the rate of As(III) and As(V) adsorption were analyzed based on pseudo-firstand pseudo-second order kinetic models. The adsorption data at constant temperature were described by the Langmuir and Freundlich isotherm equation, and the theoretical adsorption capacity of ferric hydroxide was determined to be 43.75 mg/g and 44.04 mg/g for arsenic(III) and (V), respectively. The estimated thermodynamic parameters, including changes in free energy, enthalpy and entropy, revealed that the adsorption is spontaneous and endothermic under applied experimental conditions.
    Źródło:
    Environment Protection Engineering; 2018, 44, 4; 117-129
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of 2,4,6-trichlorophenol from aqueous solutions using agricultural waste as low-cost adsorbents
    Autorzy:
    Kuśmierek, K.
    Świątkowski, A.
    Dąbek, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/207901.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    activated carbon
    heavy metals
    Langmuir isotherm
    Freundlich models
    węgiel aktywny
    metale ciężkie
    odpady rolnicze
    izoterma Langmuira
    Opis:
    Agricultural waste products including sunflower seed hulls, pumpkin seed shells, walnut shells and peanut shells were used as low-cost adsorbents for the removal of 2,4,6-trichlorophenol (TCP) from aqueous solutions. The effects of adsorbent dosage, pH and ionic strength on the adsorption of TCP were investigated. The results showed that the adsorption of TCP was pH dependent and increased upon increasing the ionic strength of the solution. The adsorption kinetics was found to follow a pseudo-second order kinetics. The equilibrium adsorption data were fitted to the Langmuir, Freundlich and Sips isotherms and the best results were achieved with the Freundlich model. The desorption of TCP using deionized water, water/methanol mixture or 5% sodium hydroxide was also studied. The results suggest that the tested materials may be used as an effective adsorbents without any treatment or any other modification for removal of TCP from the aqueous medium.
    Źródło:
    Environment Protection Engineering; 2017, 43, 4; 149-163
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of Ni(II) ions from aqueous solutions using manganese oxide nanoparticles from buffelgrass, Cenchrus ciliaris L., as green adsorbent. Kinetics and thermodynamic studies
    Autorzy:
    Kiruba, Dunston Angeline
    Muthukumaran, Karpagasundaram
    Thamarai, Perumal
    Powiązania:
    https://bibliotekanauki.pl/articles/2057616.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Cenchrus ciliaris L.
    ecosystem
    Langmuir isotherm
    Freundlich isotherm
    heavy metals
    ekosystem
    izoterma Langmuira
    izoterma Freundlicha
    metale ciężkie
    Opis:
    Manganese oxide nanoparticles (MnONPs) synthesized from buffelgrass, Cenchrus ciliaris (L.), an invasive weed posing threats to ecosystems, are used in this study to remove nickel(II) ions from aqueous solutions. As a biosorbent, the synthesized MnONPs were put to the test. MnONPs were studied for their surface morphology and functional properties. A variety of adsorbent dosages and contact times were tested in batch experiments to see how they affected adsorption rates. At pH 6.0 and room temperature, MnONPs had an 87.1% removal efficiency for Ni(II) ions. Pseudo-second order correlations had a higher R2 value (0.988). In the Langmuir plot, a maximum adsorption capacity of 4.78 mg/g was observed. However, the experimental data fitted well with both Langmuir and Freundlich isotherm models (R2 = 0.99). Spontaneous and exothermic was the nature of the adsorption process. To remove heavy metal ions contaminants from aqueous solutions, these results suggested that MnONPs synthesized from buffelgrass extract could be used.
    Źródło:
    Environment Protection Engineering; 2022, 48, 1; 135--149
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the sorption properties of materials proposed for the construction of insulation barriers
    Autorzy:
    Sobik-Szołtysek, J.
    Bień, J.
    Grosser, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/207055.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    acid solution
    batch methods
    Insulation barriers
    landfill site
    Langmuir isotherm
    Freundlich isotherm
    mineral wastes
    roztwor kwasu
    metoda wsadowa
    bariera izolacyjna
    składowiska odpadów
    izoterma Langmuira
    izoterma Freundlicha
    odpady mineralne
    Opis:
    Sorption properties of fine-grain mixtures of mineral waste proposed for construction of separation screens in landfill sites have been examined. The removal of heavy metals by the mixtures analysed was evaluated by the static batch method. It was found that they characterize by high ability to remove heavy metals at the level of over 99%, even with high contents of these elements. The sorption parameters have been determined based on the Langmuir and Freundlich isotherms. The alkaline character of some components of mixtures provides stabilization of pH, preventing removal of heavy metals to the environment in response to contact a barrier with acid solutions.
    Źródło:
    Environment Protection Engineering; 2016, 42, 1; 169-189
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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