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Wyszukujesz frazę "Morawski, A.W." wg kryterium: Autor

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    Wyświetlanie 1-9 z 9
    Tytuł:
    Removal of organic dye in the hybrid photocatalysis/membrane processes system
    Autorzy:
    Grzechulska-Damszel, J.
    Morawski, A.W.
    Powiązania:
    https://bibliotekanauki.pl/articles/779880.pdf
    Data publikacji:
    2007
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    dwutlenek tytanu
    fotokataliza
    procesy membranowe
    barwniki organiczne
    układy hybrydowe
    titanium dioxide
    photocatalysis
    membrane processes
    organic dyes
    hybrid systems
    Opis:
    The removal of azo dye Acid Red 18 in hybrid photocatalysis/membrane processes systems was investigated. The photocatalytic reactions were conducted in the reactor with photocatalyst suspended in the solution. The reaction solution was recirculated through the ultrafiltration system. A commercially available titanium dioxide (AeroxideŽ P25, Degussa, Germany) was used as a photocatalyst. The solution after the photocatalytic/UF reaction was applied as the feed for the membrane distillation process. The changes of various parameters, including the concentration of the dye, pH and the conductivity of the solution, TOC and TDS content were analyzed during the process. It was found that azo dye Acid Red 18 could be successfully decolourised in the hybrid photocatalysis/UF system. The catalyst particles were retained in the feed solution by means of the ultrafiltration membrane so the obtained permeate was free of TiO2. The application of ultrafiltration together with the photocatalytic process results in the separation of photocatalyst from the treated solution but does not give the complete removal of organic matter from the reaction mixture. Membrane distillation applied with the permeate after the photocatalysis/UF process as a feed gives a complete separation of TOC from the treated solution and the obtained product is practically pure water.
    Źródło:
    Polish Journal of Chemical Technology; 2007, 9, 2; 94-98
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Water purification using a novel reactor with the photoactive refill
    Autorzy:
    Grzechulska-Damszel, J.
    Morawski, A.W.
    Powiązania:
    https://bibliotekanauki.pl/articles/779398.pdf
    Data publikacji:
    2009
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    dwutlenek tytanu
    fotokataliza
    reaktor przepływowy
    barwniki organiczne
    titanium dioxide
    photocatalysis
    flow reactor
    photoactive coating
    organic dyes
    Opis:
    The aim of the presented work was the removal of organic dye, Acid Red 18, from water using a novel reactor with the photoactive refill. Titanium dioxide was immobilized on the base material as a thin layer from the alcoholic suspension followed by thermal stabilization. The prepared coating exhibits high stability in repeated cycles of water treatment. The complete removal of colour was achieved in a relatively short time of 14 hours. The proposed reactor with the photoactive refill solves the problem of the necessity of the replacement of the reactor or parts of the reactor when the photocatalysts activity decreases. In the case of activity drop of the photocatalyst, only the photoactivve refill can be easily replaced.
    Źródło:
    Polish Journal of Chemical Technology; 2009, 11, 1; 61-63
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ aktywności wody i temperatury na wzrost oraz aktywność lipolityczną szczepów Penicillium chrysogenum w pożywkach płynnych z olejami roślinnymi
    Effect of water activity and temperature on growth and lipolytic activity of Penicillium chrysogenum strains in liquid culture media with plant oils
    Autorzy:
    Janda, K.
    Markowska-Szczupak, A.
    Morawski, A.W.
    Powiązania:
    https://bibliotekanauki.pl/articles/827327.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Technologów Żywności
    Tematy:
    Penicillium chrysogenum
    hodowla mikroorganizmow
    pozywki plynne
    aktywnosc wody
    temperatura
    aktywnosc lipolityczna
    oleje roslinne
    Opis:
    Szczepy P. chrysogenum wyizolowane z nasion rzepaku, soi i słonecznika hodowano w pożywkach płynnych z dodatkiem oleju rzepakowego, sojowego i słonecznikowego. Zbadano wpływ aktywności wody (aw) pożywki (0,995, 0,950, 0,900 i 0,850) i temperatury (15 i 25 ºC) na zawartość suchej masy grzybni i aktywność lipolityczną. Wzrost grzybni badanych szczepów był zróżnicowany w zależności od aw i temperatury. Aktywność lipolityczna w temperaturze 15 ºC była wyższa niż w 25 ºC. Najwyższą aktywność P. chrysogenum stwierdzono w temperaturze 15 ºC przy najniższej badanej aktywności wody pożywki. Otrzymane wyniki wskazują na możliwość inicjowania niekorzystnych zmian jakościowych olejów przez enzymy lipolityczne szczepów tego gatunku nawet wówczas, gdy nie ma widocznego (makroskopowo) wzrostu grzybni.
    Penicillium chrysogenum strains, isolated from rapeseeds, soybean, and sunflower seeds, were incubated in a liquid medium with rapeseed oil, soybean oil, and sunflower oil added. The effects of water activity (aw) of the medium (0.995; 0.950; 0.900; 0.850) and temperature (15 and 25 ºC) were studied on the dry mass content of mycelium and on the lipolytic activity. The growth of the mycelium of the strains analyzed varied depending on aw and temperature. The lipolytic activity at a temperature of 15 ºC was higher than that at a temperature of 25 ºC. The highest lipolytic activity of P. chrysogenum strains was reported at a temperature of 15 ºC at the lowest tested water activity of the culture medium (aw = 0.850). The results obtained prove that the lipolytic enzymes produced by the strains of that fungus can initiate disadvantageous quality changes in oils, and this is possible even where there is no visible growth of the mycelium.
    Źródło:
    Żywność Nauka Technologia Jakość; 2014, 21, 4
    1425-6959
    Pojawia się w:
    Żywność Nauka Technologia Jakość
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of the TiO2 photocatalyst using pressurized ammonia
    Autorzy:
    Wawrzyniak, B.
    Janus, M.
    Grzmil, B.
    Morawski, A.W.
    Powiązania:
    https://bibliotekanauki.pl/articles/778501.pdf
    Data publikacji:
    2007
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    fotokataliza
    TiO2
    TiO2-azot
    odbarwianie barwników
    photocatalysis
    TiO2-nitrogen
    dye decolorization
    preparation under pressure
    Opis:
    The industrial hydrated amorphous titanium dioxide (TiO2 ź xH2O) was modified by treatment inside a chemical reactor under elevated pressure at low temperatures for 4 hours in an ammonia atmosphere. On the basis of the FTIR/DRS analysis the presence of nitrogen was confirmed. The XRD patterns of all of the catalysts exhibit mainly the diffraction lines of anatase phases. The photocatalytic activity of the modified photocatalysts was determined and compared to TiO2-P25 (Degussa, Germany). The high rate of phenol and dye degradation was obtained for the catalysts modified at 180°/5atm. TiO2-P25 showed similar activity in phenol decomposition like TiO2-15bar, whereas it was more active in dye decomposition.
    Źródło:
    Polish Journal of Chemical Technology; 2007, 9, 1; 51-56
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption of humic acid on mesoporous carbons prepared from poly- (ethylene terephthalate) templated with magnesium compounds
    Autorzy:
    Karolczyk, J.
    Mozia, S.
    Morawski, A.W.
    Przepiórski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/778949.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    porous carbon
    adsorption
    humic acid
    fluorescence spectroscopy
    Opis:
    Porous carbons obtained from poly(ethylene terephtalate) contained in a mixture with either MgCO3 or Mg(OH)2 were examined as adsorbents for removal of humic acid from water. Adsorption of the model contaminants is discussed in relation to the textural parameters of the obtained carbon materials. Pore structure parameters of the carbonaceous materials were strongly influenced by preparation conditions including temperature and relative amounts of the inorganics used during preparations as template. Porous carbons prepared revealed a potential to purify water from the model contaminant of high molecular weight. The results presented confirmed a key role of mesoporosity in the adsorption of humic acid. Fluorescence spectroscopy was confirmed to be an useful method to evaluate concentration of humic acid in water.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 4; 95-99
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of Performance of Hybrid Photolysis-DCMD and Photocatalysis-DCMD Systems Utilizing UV-C Radiation for Removal of Diclofenac Sodium Salt From Water
    Autorzy:
    Mozia, S.
    Darowna, D.
    Przepiórski, J.
    Morawski, A.W.
    Powiązania:
    https://bibliotekanauki.pl/articles/779272.pdf
    Data publikacji:
    2013
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    photocatalytic membrane reactor,
    direct contact membrane distillation
    photolysis
    photocatalysis
    diclofenac sodium salt
    Opis:
    The removal of a non-steroidal anti-inflammatory drug (NSAID) diclofenac sodium salt (DCF, C14H10Cl2NNaO2) from water in two hybrid systems coupling photolysis or photocatalysis with direct contact membrane distillation (DCMD) is presented. A UV-C germicidal lamp was used as a source of irradiation. The initial concentration of DCF was in the range of 0.005-0.15 mmol/dm3 and the TiO2 AeroxideŽ P25 loading (hybrid photocatalysis-DCMD) ranged from 0.05 to 0.4 g/dm3. Regardless of the applied hybrid system and the initial concentration of DCF, the model drug was completely decomposed within 4h of irradiation or less. Mineralization was less efficient than photodecomposition. In case of the hybrid photolysis-DCMD process the efficiency of TOC degradation after 5h of irradiation ranged from 27.3-48.7% depending on the DCF initial concentration. The addition of TiO2 allowed to improve the efficiency of TOC removal. The highest degradation rate was obtained at 0.3 gTiO2/dm3. During the process conducted with the lowest DCF initial concentrations (0.005-0.025 mmol/dm3) a complete mineralization was obtained. However, when higher initial amounts of DCF were used (0.05-0.15 mmol/dm3), the efficiency of TOC degradation was in the range of 82.5-85%. The quality of distillate was high regardless of the system: DCF was not detected, TOC concentration did not exceeded 0.7 mg/dm3 (1.9 mg/dm3 in permeate) and conductivity was lower than 1.6 žS/cm.
    Źródło:
    Polish Journal of Chemical Technology; 2013, 15, 1; 51-60
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dye decomposition on P25 with enhanced adsorptivity
    Autorzy:
    Janus, M.
    Wawrzyniak, B.
    Tryba, B.
    Morawski, A.W.
    Powiązania:
    https://bibliotekanauki.pl/articles/779704.pdf
    Data publikacji:
    2008
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    fotokatalizator
    N-domieszkowanie
    dwutlenek tytanu
    barwnik azowy
    visible-light active photocatalyst
    N-doped
    titanium dioxide
    azo dye
    Opis:
    The preparation method and the activity of the TiO2-P25/N doped photocatalyst based on commercial titanium dioxide (TiO2 AeroxideŽ P-25 Degussa, Germany) are presented. For the TiO2-P25/N preparation TiO2-P25 and gaseous ammonia were kept in a pressure reactor (10 bars) for 4 hours at the temperature of 200°C. This modification process changed the chemical structure of the TiO2 surface. The formation of NH4+ groups was confirmed by the FTIR measurements. Two bands in the range of ca. 1430 - 1440 cm-1 attributed to bending vibrations of NH4+ could be observed on the FTIR spectra of the catalysts modified with ammonia and the band attributed to the hydroxyl groups at 3300 - 3500 cm-1, which were not reduced after N-doping. The photocatalytic activity of the photocatalysts was checked through the decomposition of two dyes under visible light irradiation. The modified TiO2 thus prepared samples were more active than TiO2-P25 for the decomposition of dyes under visible light irradiation.
    Źródło:
    Polish Journal of Chemical Technology; 2008, 10, 2; 11-16
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    TiO2 modified by ammonia as a long lifetime photocatalyst for dyes decomposition
    Autorzy:
    Choina, J.
    Dolat, D.
    Kusiak, E.
    Janus, M.
    Morawski, A.W.
    Powiązania:
    https://bibliotekanauki.pl/articles/778832.pdf
    Data publikacji:
    2009
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    fotokataliza
    TiO2 modyfikowany azotem
    żywotność
    photocatalysis
    nitrogen-modified TiO2
    lifetime
    Opis:
    Ammonia-modified TiO2 (TiO2/N), prepared in a pressure reactor was used as the well- active and longlife photocatalyst for the azo dye (Reactive Red 198) decomposition. The effect of aeration and the different value of the pH of the reaction medium on the photocatalytic degradation of Reactive Red 198 in water has been investigated. It has been reported that the degradation is greatly influenced by the reaction pH and the faster decomposition of azo dye took place at pH 3.5. When the solution was acidic, a larger amount of azo dye on the positively charged surface of TiO2 photocatalysts was adsorbed. From the obtained results it can be seen that the effectiveness of the decolourisation of the solution was faster by using the nitrogen-modified TiO2.
    Źródło:
    Polish Journal of Chemical Technology; 2009, 11, 4; 1-6
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carbon modified TiO2 photocatalysts for water purification
    Autorzy:
    Morawski, A.W.
    Janus, M.
    Tryba, B.
    Toyoda, M.
    Tsumura, T.
    Inagaki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/779326.pdf
    Data publikacji:
    2009
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    TiO2/AC
    TiO2 dopowany węglem
    TiO2 pokryty węglem
    fotokataliza
    carbon-doped TiO2
    carbon-coated TiO2
    photocatalysis
    Opis:
    Carbon can form different structures with TiO2: carbon-doped TiO2, carbon coated TiO2 and composites of TiO2 and carbon. The presence of carbon layer on the surface of TiO2 as well as the presence of porous carbon in the composites with TiO2 can increase the concentration of organic pollutants on the surface of TiO2, facilitating the contact of the reactive species with the organic molecules. Carbon-doped TiO2 can extend the absorption of the light to the visible region by the narrowing of the band gap and makes the photocatalysts active under visible light irradiation. TiO2 loaded carbon can also work as a photocatalyst, on which the molecules are adsorbed in the pores of carbon and then they undergo the photocatalytic decomposition with UV irradiation. Enhanced photocatalytic activity for the destruction of some organic compounds in water was noticed on the carbon coated TiO2 and TiO2 loaded activated carbon, mostly because of the adsorptive role of carbon. However, in carbon-doped TiO2, the role of carbon is somewhat different, the replacement of carbon atom with Ti or oxygen and formation of oxygen vacancies are responsible for extending its photocatalytic activity towards the visible range.
    Źródło:
    Polish Journal of Chemical Technology; 2009, 11, 2; 46-50
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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