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    Wyświetlanie 1-8 z 8
    Tytuł:
    Preliminary studies of photocatalytic activity of gypsum plasters containing TiO2 co-modified with nitrogen and carbon
    Autorzy:
    Janus, M.
    Bubacz, K.
    Zatorska, J.
    Kusiak-Nejman, E.
    Czyżewski, A.
    Morawski, A. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/778867.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    titanium dioxide
    gypsum
    TiO2/N
    self-cleaning
    Reactive Red 198
    Opis:
    The conducted studies were focused on the development of the gypsum material exhibiting self-cleaning properties. To this end, the raw gypsum was mixed with unique TiO2-based photocatalysts, previously modified by nitrogen and/ or carbon doping. The photocatalytic activity of the obtained gypsum plasters was evaluated trough the degradation of model organic compound (Reactive Red 198) under UV-vis irradiation. The impact of the photocatalysts presence on the physicochemical properties of the obtained gypsum plasters was evaluated. Furthermore, the role of non-metals presence on the photocatalytic properties of the TiO2 was determined. It was confirmed that the addition of N,C co-modified titanium dioxide into gypsum bestows this material with self-cleaning properties. The highest dye removal rate was displayed by the gypsum plaster containing optimal amount (10 wt%) of co-modified TiO2/N,C photocatalyst, after 20 hours of UV-vis irradiation.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 2; 96-102
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of calcination temperature on optical and structural properties of TiO2 thin films prepared by means of sol-gel and spin coating
    Autorzy:
    Tański, T.
    Matysiak, W.
    Kosmalska, D.
    Lubos, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/201456.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    TiO2 thin films
    spin coating
    optical properties
    structural properties
    calcination
    sol-gel
    titanium dioxide
    Cienkie warstwy TiO2
    właściwości optyczne
    właściwości strukturalne
    kalcynacja
    zol-żel
    dwutlenek tytanu
    Opis:
    In this study, ceramic TiO2 thin films were prepared on glass substrates using sol-gel and spin-coating methods from the TNBT/ AcOH/ EtOH/ H2O solution. The obtained coatings were subjected to drying at room temperature and were then calcined in the air at different temperatures in a range of 400–600°C in order to obtain clean TiO2   layers. The surface morphology and chemical composition were characterized with the use of a scanning electron microscope (SEM) and an energy dispersive spectrometer (EDX). Research has shown the presence of elements in the TiO2   and the influence of temperatures on layer thickness. Analysis of optical properties and energy gap width of the prepared coatings was determined by means of spectra analysis of absorbance as a function of radiation energy obtained with the use of the UV-VIS spectrophotometer. The obtained spectra of the layers are characterized by a shift of absorption lines towards the visible light wavelengths and the obtained values of band gaps decrease as the calcination temperature rises. The obtained and developed results of TiO2   thin films testify to the wide application possibilities of the layers in elements which use photocatalytic processes such as self-cleaning surfaces, solar cells, pollution removing membranes and optoelectronic components.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 2; 151-156
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and physicochemical characteristics of titanium dioxide doped with selected metals
    Autorzy:
    Siwinska-Stefanska, K.
    Paukszta, D.
    Piasecki, A.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/951839.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    titanium dioxide
    sol-gel method
    doping
    TiO2 surface modification
    Fe and Co dopant
    Opis:
    The paper details with of the preparation and physicochemical characterisation of nano- and microstructured TiO2 doped with Fe and Co produced by the sol-gel method using titanium alkoxide as the precursor of titania as well as iron or cobalt nitrates as dopant sources. Fe and Co doped TiO2 materials were successfully prepared with two different methods. The effect of the dopant type on the synthesis of TiO2 powders was investigated. The physicochemical properties of the studied samples were determined. The characterisation included determination of the dispersion and morphology of the systems (particle size distribution, SEM images), characteristics of porous structure (BET isotherms), crystalline structure (XRD), surface composition (EDS), as well as thermal stability (TG/DTA).
    Źródło:
    Physicochemical Problems of Mineral Processing; 2014, 50, 1; 265-276
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of magnesium aluminate spinel doped TiO2 from magnesite waste
    Autorzy:
    Canikoğlu, Nuray
    Powiązania:
    https://bibliotekanauki.pl/articles/2048865.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnesium aluminate spinel
    MgAl2O4
    titanium dioxide
    TiO2
    magnesite waste
    alumina
    Al2O3
    Opis:
    Magnesium aluminate spinel (MgAl2O4) is an important refractory material of magnesia origin. It is formed by the reaction of magnesium and aluminum oxides. In this study, TiO2 was added to magnesite waste and alumina (Al2O3) powders in different proportions and the mixtures were sintered at different temperatures after shaping. The aim of this study was to produce spinel economically by recycling waste materials. Therefore, titanium dioxide (TiO2) added magnesium aluminate spinel was produced and the products obtained were characterized by XRD and SEM-EDS analyses. In addition, bulk density, apparent porosity and microhardness values were measured and the effects of TiO2 additive on magnesium aluminate properties were examined. The better values were determined in samples doped 4 wt.% TiO2 at the sintering temperature of 1400°C.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 311-316
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza właściwości cienkich warstw Tio2 do aplikacji w elastycznych przyrządach fotowoltaicznych i optoelektronicznych
    Analysis of Properties of Thin Tio2 Layers for Application in Photovoltaic and Optoelectronic Devices
    Autorzy:
    Sibiński, M.
    Znajdek, K.
    Tadaszak, K.
    Posadowski, W.
    Sawczak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/159892.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
    Tematy:
    dwutlenek tytanu
    TiO2
    ogniwa fotowoltaiczne
    transparentne tlenki przewodzące
    TCO
    titanium dioxide
    photovoltaic cells
    transparent conductive oxides
    Opis:
    Artykuł jest opisem analizy nowej metody nakładania cienkich warstw dwutlenku tytanu pod kątem jej aplikacji w ogniwach słonecznych z uwzględnieniem elastycznych struktur fotowoltaicznych. Uzyskane warstwy zostały poddane zarówno charakteryzacji optycznej i elektrycznej, jak również badaniom strukturalnym w celu weryfikacji możliwości ich zastosowań w charakterze emiterowych pokryć przewodzących w strukturach fotowoltaicznych. Dodatkowo, w ramach oceny potencjału zastosowania TiO2 w elastycznych ogniwach słonecznych, badane warstwy otrzymane na elastycznych podłożach PET zostały przetestowane pod kątem wpływu dynamicznych cykli zginania na zmianę ich rezystancji na kwadrat. Jako ostateczna weryfikacja potencjału uzyskanych warstw do produkcji przyrządów fotowoltaicznych wykonano prototypowe ogniwo słoneczne, pokryte TiO2, oraz sprawdzono jego podstawowe parametry elektryczne.
    This paper presents properties of titanium dioxide thin films prepared in reactive pulse magnetron deposition method using differential variants of process parameters. Layers of TiO2 were deposited on both glass and polymer foil substrates. They were characterized in terms of optical and electrical parameters in order to verify their possible application as emitter conductive coatings in photovoltaic structures. Additionally, within the evaluation process of potential TiO2 application in flexible solar cells, layers deposited on PET foils, were investigated for mechanical durability. They were tested in terms of the influence of dynamic bending cycles on surface resistance per square changes.
    Źródło:
    Prace Instytutu Elektrotechniki; 2014, 264; 99-112
    0032-6216
    Pojawia się w:
    Prace Instytutu Elektrotechniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of calcination temperature on photocatalytic activity of TiO2. Photodecomposition of mono- and polyazo dyes in water
    Autorzy:
    Mozia, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/779014.pdf
    Data publikacji:
    2008
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    fotokataliza
    dwutlenek tytanu
    TiO2
    anataz
    wielkość krystalitów
    barwnik azowy
    photocatalysis
    titanium dioxide
    anatase
    rutile
    crystallite size
    azo dye
    Opis:
    The presented studies have focused on the influence of TiO2 properties, such as crystalline phase, crystallite size and surface area, on the effectiveness of degradation of azo dyes in water under UV irradiation. Two monoazo dyes: Acid Red 18 (AR18, C20H11N2Na3O10S3) and Acid Yellow 36 (AY36, C18H14N3NaO3S), and one polyazo dye Direct Green 99 (DG99, C44H28N12Na4O14S4) were applied as model compounds. The photocatalysts were prepared from a crude titanium dioxide obtained directly from the production line (sulfate technology) at the Chemical Factory "Police" (Poland). The crude TiO2 was calcinated in air for 1-4h at the temperatures ranging from 600 to 800°C. The BET specific surface area of TiO2 decreased gradually with increasing the calcination temperature. The crude TiO2 exhibited specific surface area of 277 m2/g. In case of the catalysts heated at 600, 700 and 800°C the BET surface area amounted to 62.3-53.3, 33.4-26.8 and 8.9-8.3 m2/g, for the calcination time of 1-4h, respectively. The crystallite size of anatase increased with increasing heat treatment temperature and ranged from 19 to 53 nm, for the temperatures of 600-800°C, respectively. The catalysts annealed at 600 and 700°C contained primarily anatase phase (94-97%), whereas the photocatalysts heated at 800°C were composed mainly of rutile (97-99%). The highest effectiveness of azo dyes degradation was obtained in case of the photocatalyst calcinated for 1h at 700°C. The photocatalyst was composed mainly of anatase (97%) with crystallite size of 27 nm. The most effectively photodegraded was AR18, having the molecular weight of 640.4 g/mol. The most difficult to degrade was AY36 exhibiting the lowest molecular weight from all the dyes used (375.4 g/mol).
    Źródło:
    Polish Journal of Chemical Technology; 2008, 10, 3; 42-49
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photocatalytic degradation of pharmaceuticals using TiO2 based nanocomposite catalyst - review
    Autorzy:
    Fawzi Suleiman Khasawneh, Omar
    Palaniandy, Puganeshwary
    Powiązania:
    https://bibliotekanauki.pl/articles/396623.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    nanocomposite
    catalyst
    photocatalysis
    TiO2
    pharmaceutical compounds
    photocatalytic process
    titanium dioxide
    nanokompozyt
    katalizator
    fotokataliza
    związki farmaceutyczne
    proces fotokatalityczny
    dwutlenek tytanu
    Opis:
    The occurrence of contaminants of emerging concern (CECs) such as pharmaceutical compounds (PhACs) is becoming a major global issue due to the persistence, bioaccumulation, and toxicity of these pollutants. Human and animal consumption was recognized as the major sources for pharmaceutical pollution. Existent conventional treatment processes have shown low degradation efficiencies towards PhACs. In this regard, TiO2 based nanocomposite photocatalysis process has presented effective degradation towards PhACs. Operational parameters such as dopant content, catalyst loading, and initial pH were the major factors in the photocatalysis system. In this review, we discuss the recent studies that have employed TiO2 based nanocomposite for the degradation of PhACs. Future research recommendations have also been elaborated.
    Źródło:
    Civil and Environmental Engineering Reports; 2019, 29, 3; 1-33
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fotokatalityczna degradacja herbicydów : nowe katalizatory na bazie TiO2
    Photocatalytic degradation of herbicydes : new catalysts based on TiO2
    Autorzy:
    Ożóg, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/172094.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    tlenek tytanu
    TiO2
    degradacja fotokatalityczna
    kwas 2,4-dichlorofenoksyoctowy
    2,4-D
    kwas 2,4,5-trichlorofenoksyoctowy
    2,4,5-T
    4G-PHOTOCAT
    titanium dioxide
    photocatalytic degradation
    2,4-dichlorophenoxyacetic
    2,4,5-trichlorophenoxyacetic
    Opis:
    Over the past few decades a rapid increase in standard of living is observed. Rapid urbanization and development of new technologies, which are focused on the needs of a modern society, influence negatively the environment. The present policy of sustainable development is focused on the principles of rational use of scarce resources and raw materials. New technologies should comply with a number of requirements: efficiency, low costs and a low impact on the environment. Photocatalytic processes are the answer for these requirements. Photocatalysis can be used in many aspects of everyday life, offering self-cleaning surfaces, photo-drugs (e.g. for photodynamic therapy) and even photovoltaic devices. Photocatalytic degradation of pollutants in the presence of inorganic photocatalysts (e.g. TiO2 or ZnO) is one of the available methods of removing impurities from aqueous and gaseous phases. The main advantage of this process is the lack of wastes and formation of carbon dioxide, water and simple inorganic ions as end- -products. The aim of our work was to develop new TiO2-based photocatalysts doped with tungsten and molybdenum oxides. A series of materials with different content of the dopants, calcined at various temperatures, was prepared. The photocatalytic activity of the materials was determined following the degradation of two model herbicides: 2,4-dichlorophenoxyacetic acid (2,4-D) and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T). These compounds are used for the control of weed growth on crop plantations, but in a high dosage they can lead to destruction of the plants. They are readily soluble in water, therefore their use is simple, but brings a great risk to aquatic organisms and people. Photocatalytic degradation of herbicides is the main goal of the 4G-PHOTOCAT project. The efforts are directed towards development of a low-cost photocatalytic paint, that could be used in reactors for groundwater purification. The active ingredient of the paint is a composite material based on TiO2 modified with other metal oxides.
    Źródło:
    Wiadomości Chemiczne; 2015, 69, 7-8; 606-616
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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