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    Wyświetlanie 1-11 z 11
    Tytuł:
    The Effect of Oxygen Staging on Nitrogen Conversion in Oxy-Fuel CFB Environment
    Autorzy:
    Jankowska, S.
    Czakiert, T.
    Krawczyk, G.
    Borecki, P.
    Jesionowski, Ł.
    Nowak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/185424.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    paliwo tlenowe
    CFB
    oxy-fuel
    fuel-N
    Opis:
    This paper presents a study on nitrogen conversion in oxy-fuel coal combustion in a pilot scale CFB 0.1 MWth facility. The paper is focused on fuel-N behaviour in the combustion chamber when the combustion process is accomplished under oxy-fuel CFB conditions. The analysis is based on infurnace sampling of flue gas and calculations of the conversion ratios of fuel-nitrogen (fuel-N) to NO, NO2, N2O, NH3 and HCN. For the tests, O2/CO2 mixtures with the oxygen content of 21 vol.% (primary gas) and with the oxygen content varied from 21 to 35 vol.% (secondary gas), were used as the fluidising gas. Measurements were carried out in 4 control points located along the combustion chamber: 0.43 m, 1.45 m, 2.50 m and 4.88 m. Results presented below indicate that an increased oxygen concentration in the higher part of the combustion chamber has strong influence on the behaviour of fuel based nitrogen compounds.
    Źródło:
    Chemical and Process Engineering; 2014, 35, 4; 489-496
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of lead(II) ions by an adsorption process with the use of an advanced SiO2/lignin biosorbent
    Autorzy:
    Klapiszewski, Ł.
    Bartczak, P.
    Szatkowski, T.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/949403.pdf
    Data publikacji:
    2017
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    adsorption
    SiO2/lignin biosorbent
    lead(II) ions
    treatment of aqueous systems
    adsorption kinetics
    Opis:
    We demonstrate here that lignin can be successfully combined with silica to create a multifunctional material with considerable sorption capabilities. Experiments were carried out in which a silica/lignin hybrid was used for the removal of lead(II) ions from water solutions. Adsorption kinetics were also determined and preliminary regeneration tests were performed. The effectiveness of the adsorption process depends on the following parameters: contact time of adsorbent and adsorbate (equilibrium times: 5 min for concentration 25 mg/L, 10 min for 50 and 75 mg/L, 60 min for 100 mg/L), pH (optimal pH = 5) and adsorbent mass. The kinetics of the adsorption of lead(II) ions on the SiO2/lignin biosorbent are best described by a pseudo-second-order model. Adsorption isotherms of lead(II) ions were also determined. The experimental data were found to be in agreement with the Langmuir model, and the maximal sorption capacity of the adsorbent with respect to lead(II) was 89.02 mg/g.
    Źródło:
    Polish Journal of Chemical Technology; 2017, 19, 1; 48-53
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calcium lignosulfonate as eco-friendly additive for crosslinking fibrous composites with phenol-formaldehyde resin matrix
    Lignosulfonian wapnia jako przyjazny środowisku dodatek do sieciowania kompozytów włóknistych na bazie żywicy fenolowo-formaldehydowej
    Autorzy:
    Klapiszewski, Ł.
    Oliwa, R.
    Oleksy, M.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/947478.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    calcium lignosulfonate
    composite
    phenol-formaldehyde resin
    lignosulfonian wapnia
    kompozyt
    żywica fenolowo-formaldehydowa
    Opis:
    The possibility of application of calcium lignosulfonate (CLS) as an eco-friendly additive for crosslinking fibrous composites with phenol-formaldehyde resin matrix was investigated. CLS has been characterized in detail in terms of its physicochemical and dispersive-morphological properties. The compositions of phenol-formaldehyde resin with CLS or with bentonite modified with trimethyl-2-hydroxypropyl ammonium chloride were prepared. Such compositions were used to impregnate fiberglass meshes. Mechanical properties of the prepared samples were determined, and their morphology as well as surface properties were assessed. A pronounced effect of the type of applied filler on the mechanical properties was observed. The best results were obtained for fiberglass meshes impregnated using phenol-formaldehyde resin with 1 wt % modified bentonite and 1 wt % CLS.
    Badano możliwości zastosowania lignosulfonianu wapnia (CLS) jako przyjaznego środowisku dodatku stosowanego do sieciowania kompozytów włóknistych, których osnowę stanowiła żywica fenolowo-formaldehydowa. Na wstępie szczegółowo scharakteryzowano CLS określając jego najważniejsze właściwości fizykochemiczne i dyspersyjno-morfologiczne. Następnie wytworzono kompozycje żywicy fenolowo-formaldehydowej z CLS lub z bentonitem modyfikowanym chlorkiem trimetylo-2-hydroksypropyloamoniowym. Tak przygotowanych kompozycji użyto do impregnacji siatek z włókna szklanego. Zbadano właściwości mechaniczne oraz oceniono morfologię i właściwości powierzchniowe sporządzonych próbek. Stwierdzono wyraźny wpływ rodzaju zastosowanego napełniacza na parametry wytrzymałościowe próbek. Najlepsze rezultaty uzyskano w przypadku siatek szklanych impregnowanych żywicą fenolowo-formaldehydową z dodatkiem 1 % mas. modyfikowanego bentonitu i 1 % mas. CLS.
    Źródło:
    Polimery; 2018, 63, 2; 102-108
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lignosulfonate and silica as precursors of advanced composites
    Autorzy:
    Klapiszewski, Ł.
    Nowacka, M.
    Siwińska-Stefańska, K.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/778432.pdf
    Data publikacji:
    2013
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Magnesium lignosulfonate
    silica
    Silica/lignosulfonate composite
    Physicochemical and structural properties
    Opis:
    Advanced silica/lignosulfonate composites were obtained using magnesium lignosulfonate and silica precipitated in a polar medium. For comparative purposes analogous synthesis was performed using commercial silica Aerosil®200. Lignosulfonates are waste products of paper industry and their application in new multifunctional materials is of great economic interest. The composites obtained were subjected to thorough characterization by determination of their physicochemical, dispersive-morphological and electrokinetic properties. Their particle size distribution was measured, SEM images were taken, FT-IR analysis and colorimetric study were made, thermal and electrokinetic stabilities and parameters of porous structure were also determined. The results can be of interest in further application studies.
    Źródło:
    Polish Journal of Chemical Technology; 2013, 15, 3; 103-109
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Advanced biocomposites based on silica and lignin precursors
    Autorzy:
    Klapiszewski, Ł.
    Nowacka, M.
    Szwarc-Rzepka, K.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/110719.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    biocomposites
    silica
    lignin
    physicochemical and structural properties
    Opis:
    A new method is proposed for obtaining biocomposites based on a combination of silica and lignin precursors. Amorphous silica was produced by two methods: one based on hydrolysis and condensation of tetraethoxysilane (sol–gel method) and the other involving precipitation in a polar medium. Additionally, the commercial silica known under the name of Syloid®244 was used. The silica surface was modified to ensure better affinity of the support to activated lignin. The biocomposites obtained were carefully characterised by determination of their physicochemical and dispersive–morphological properties. Electrokinetic stability of the biocomposites was evaluated on the basis of zeta potential dependence on pH. Thermal stability of the biocomposites and their porous structure parameters (surface area, pore diameter and pore volume) were established. The results indicate that silica/lignin biocomposites are much promising for application in many areas of science and industry.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2013, 49, 2; 497-509
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Activated lignin and aminosilane-grafted silica as precursors in hybrid material production
    Autorzy:
    Klapiszewski, L.
    Szalaty, T. J.
    Zdarta, J.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/951851.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    SiO2/lignin hybrids
    silica
    lignin
    lignin activation
    thermal stability
    hybrid material
    Opis:
    Functional inorganic-organic hybrids were synthesized using as a precursor silica with the addition of an appropriate amount of lignin as components. Three types of silica were applied as the support: the commercial silicas Syloid 244 and Aerosil 200, and hydrated silica precipitated in a polar system. The silicon dioxide was initially functionalized with aminosilane to activate the surface, and then the silica-based material was combined with lignin oxidized using hydrogen peroxide. The obtained inorganic-organic hybrids underwent physicochemical and dispersive-morphological analysis, with comparison of the results depending on the composition of the test samples. In addition, particle size distributions were determined and the surface structure of the products assessed by scanning electron microscopy. The presence of functional groups was also determined by FTIR spectroscopy. The thermal analysis of the silica/lignin materials was also performed, as well as the elemental and colorimetric analyses, which indirectly confirmed the correctness of the synthesis process. Hybrid materials with the most favorable dispersive and morphological properties were obtained by adding a small amount of biopolymer. The thermogravimetric analysis of the SiO2/lignin hybrids indicated their good thermal stability. With increasing quantity of lignin per 100 parts by weight of silica matrix, progressive deterioration in the thermal stability of the materials was observed.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 1; 459-478
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnesium silicate conjugated with calcium lignosulfonate: In situ synthesis and comprehensive physicochemical evaluations
    Autorzy:
    Klapiszewski, Ł.
    Zietek, J.
    Ciesielczyk, F.
    Siwinska-Stefanska, K.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/109651.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    biopolymers
    hybrid materials
    synthetic magnesium silicate
    calcium lignosulfonate
    in situ sol-gel route
    Opis:
    The aim of this study was to effectively combine synthetic magnesium silicate with the lignin-derived biopolymer calcium lignosulfonate, using the in situ sol-gel route. Magnesium ethoxide and tetraethoxysilane were used as precursors of MgO and SiO2. The synthesis was carried out in alcoholic solution with the addition of ammonia solution as a promoter of hydrolysis. Calcium lignosulfonate was introduced to the reaction medium prior to the synthesis of magnesium silicate. The resulting hybrid powder material was thoroughly characterized, including morphology and particle sizes (SEM microscopy and the DLS technique), porous structure parameters (the BET method and BJH model), thermal stability (TG analysis) and electrokinetic stability (LDV measurements). FTIR spectral analysis was carried out to confirm the effectiveness of the proposed synthesis methodology. Based on the results, a mechanism is proposed for the MgSiO3/lignosulfonate interactions. The resulting novel type of hybrid material combines the multifunctional nature of the biopolymer (diversity of functional groups) with the well-developed porous structure of synthetic magnesium silicate. Its physicochemical parameters were found to depend significantly on the quantity of lignosulfonate used in the synthesis.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 3; 793-802
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Advanced organic-inorganic hybrid fillers as functional additives for poly(vinyl chloride)
    Zaawansowane organiczno-nieorganiczne napełniacze hybrydowe jako funkcjonalne dodatki do poli(chlorku winylu)
    Autorzy:
    Tomaszewska, J.
    Klapiszewski, Ł.
    Skórczewska, K.
    Szalaty, T. J.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/947205.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    lignin/silica hybrid filler
    poly(vinyl chloride)
    physicochemical properties
    structural properties
    processing properties
    napełniacz hybrydowy lignina/krzemionka
    poli(chlorek winylu)
    właściwości fizykochemiczne
    właściwości strukturalne
    właściwości przetwórcze
    Opis:
    Functional hybrid fillers (kraft lignin conjugated with Sylobloc® 41 silica) were obtained using a process of mechanical grinding of precursors. The products underwent comprehensive physicochemical and dispersive-morphological analysis. The organic-inorganic fillers have good homogeneity and a relatively high surface area. Composites of rigid poly(vinyl chloride) as a matrix with these specific dual fillers were produced in molten state. Data on the processing properties of the blends show the beneficial impact of fillers on gelation time. The presence of lignin/silica fillers strongly influences the thermal stability of PVC as well as Vicat softening temperature.
    Funkcjonalne napełniacze hybrydowe wytworzono przy użyciu ligniny krafta oraz krzemionki Sylobloc® 41, z wykorzystaniem procesu mechanicznego rozdrabniania prekursorów. Otrzymane produkty poddano analizie fizykochemicznej i dyspersyjno-morfologicznej. Wytworzone organiczno-nieorganiczne napełniacze hybrydowe charakteryzowały się jednorodną strukturą oraz rozwiniętą powierzchnią właściwą. Na bazie poli(chlorku winylu) i uzyskanych napełniaczy hybrydowych otrzymywano kompozyty w stanie stopionym. Oznaczone właściwości przetwórcze wskazują na korzystny wpływ użytych napełniaczy na czas żelowania mieszanek. Obecność układu hybrydowego lignina/krzemionka w istotnym stopniu oddziałuje także na stabilność cieplną PVC oraz jego temperaturę mięknienia wg Vicata.
    Źródło:
    Polimery; 2017, 62, 1; 19-26
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and characterisation of unmodified and poly(ethylene glycol) grafted magnesium hydroxide
    Autorzy:
    Pilarska, A.
    Nowacka, M.
    Pilarski, K.
    Paukszta, D.
    Klapiszewski, L.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/109726.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    magnesium hydroxide
    poly(ethylene glycols)
    modification
    dispersive and electrokinetic properties
    Opis:
    The method for the synthesis of either unmodified magnesium hydroxide or functionalised with poly(ethylene glycols) of different molecular weights and physicochemical properties of the products are presented. Magnesium hydroxide was obtained by the precipitation method under well defined conditions from ammonia solution and different magnesium salts. Dispersive properties of the products were characterised by polydispersity index, particle size, as well as SEM images. Crystalline structure of magnesium hydroxide samples were determined by the WAXS method. To confirm the presence of functional groups introduced by appropriate modifiers the samples were subjected to spectroscopic analysis. Electrokinetic stability of the studied samples was determined on the basis of zeta potential dependence vs. pH measurements. The modification has resulted in reduction of particle diameters in some Mg(OH)2 samples.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2013, 49, 2; 701-712
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of calcination parameters on physicochemical and structural properties of co-precipitated magnesium silicate
    Autorzy:
    Ciesielczyk, F.
    Bartczak, P.
    Klapiszewski, L.
    Paukszta, D.
    Piasecki, A.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/110710.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    magnesium silicate
    precipitation
    calcination
    WAXS
    porous structure
    Opis:
    Physicochemical properties of different oxide systems depend mostly on the method of their preparation and classification, so the main aim of the study was to obtain the MgO·SiO2 hybrid in an aqueous solution and its calcination under assumed conditions. Research scope included evaluation of the effect of the basic parameters of the calcination process (time and temperature) on the structural properties of the final materials. Products obtained by the proposed method were thoroughly characterized. The chemical composition, crystalline structure, morphology and nature of the dispersion as well as parameters of the porous structure were established. The results of research in a decisive manner confirmed the possibility of designing the properties of inorganic oxide systems such as MgO·SiO2, which will definitively scheduled into potential directions for their use.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2014, 50, 1; 119-129
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydroxyapatite as a support in protease immobilization process
    Autorzy:
    Zdarta, J.
    Budzinska, K.
    Kolodziejczak-Radzimska, A.
    Klapiszewski, Ł.
    Siwinska-Stefanska, K.
    Bartczak, P.
    Piasecki, A.
    Maciejewski, H.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/110452.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    hydroxyapatite
    enzyme immobilization
    protease
    physicochemical characteristic
    Opis:
    Hydroxyapatite is used as a matrix for immobilization of protease from Aspergillus oryzae by a process of adsorption. The matrix obtained has the surface area of 26 m2/g and particles in the shape of flakes of diameters no greater than 650 nm. The efficiency of the proposed method was confirmed by the Fourier transform infrared spectroscopy, elemental analysis and by analysis of parameters of the pore structure of matrix and products after immobilization. On the basis of the Bradford method it was found that the greatest amount of enzyme (132 mg/g) was immobilized from a solution of initial enzyme concentration of 7 mg/cm3 after 24 h of the process.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 2; 633-646
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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