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    Wyświetlanie 1-4 z 4
    Tytuł:
    Effect of sunlight and ultraviolet radiation on the efficacy of Fe-doped titanium dioxide (Fe-TiO2) nanoparticles for the removal of furfural from aqueous solutions
    Autorzy:
    Veisi, F.
    Zazouli, M. A.
    Zadeh, M. A. E.
    Charati, J. Y.
    Dezfuli, A. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/207273.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chromatography
    titanium dioxide
    ultraviolet radiation
    chromatografia
    dwutlenek tytanu
    promieniowanie ultrafioletowe
    Opis:
    Furfural, chemical compound very harmful to human health and difficult to degrade, is used or generated in many industries, including petrochemical, paper, and oil refining industries. The study evaluates the performance of Fe-TiCh nanoparticles for the removal of furfural in the presence of sunlight and UV radiation. Fe-TiO2 nanoparticles were prepared by the sol-gel method, and the characteristics of the resultant nanoparticles were determined using scanning electron microscopy. Samples with known concentrations of furfural and nanoparticles were individually exposed to sunlight and UV radiation under varying conditions, and the residual furfural concentration was measured using high- performance liquid chromatography. The results showed that for both processes the efficiency of furfural removal increased with increased reaction time, nanoparticle loading, and pH, whereas the efficiency decreased with increased furfural concentratioa The highest removal efficiencies of the Fe-TiCh/UV and Fe-TiCh/sun processes were 95 and 76%, respectively. In general, the degradation and elimination rate of furfural using Fe-TiO2/UV process was higher than Fe-TiCVsun process because TiO2 nanoparticles can only be activated upon irradiation with photons of light in the UV domain.
    Źródło:
    Environment Protection Engineering; 2017, 43, 3; 207-224
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of ZnO, CuO, Au, and TiO2 nanoparticles on Daphnia magna and early life stages of zebrafish danio rerio
    Autorzy:
    Liu, J.
    Fan, D.
    Wang, L.
    Shi, L.
    Ding, J.
    Chen, Y.
    Shen, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/207169.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    metal oxides
    titanium dioxide
    nanoparticles
    toxicity
    zinc oxide
    Daphnia magna
    nanocząsteczki
    tlenki metali
    dwutlenek tytanu
    toksyczność
    tlenek cynku
    rozwielitki
    Opis:
    The effects of four different kinds of nanoparticles (NPs), namely, CuO, ZnO, TiO2, and Au, of the sizes ranging from <20 nm to 50 nm on Daphnia magna, early life stage of zebrafish, and various enzymes have been investigated. The experimental results showed that the NPs inhibited both the body length and hatching rate of zebrafish larvae; the small nanoparticles exhibited more toxicity. In a 21 day chronic toxicity test, metal ions of higher concentrations significantly reduced the number of Daphnia magna offspring. Studies on enzyme activity showed that the NPs reduced the glutathione content and inhibited catalase and superoxide dismutase activities, resulting in shorter body length, lower hatching success, and lower reproduction of zebrafish larvae. Therefore, studies should focus more on the potential toxicity of smaller NPs.
    Źródło:
    Environment Protection Engineering; 2014, 40, 1; 139-149
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the effect of heat treatment process on characteristics and photocatalytic activity of TiO2-UV100 nanoparticles
    Autorzy:
    Behnajady, M. A.
    Alamdari, M. E.
    Modirshahla, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/208146.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    titanium dioxide
    photocatalysis
    X ray diffraction
    Brunauer Emmett Tellers
    heat treatment
    photocatalytic activity
    dwutlenek tytanu
    ditlenek tytanu
    fotokataliza
    dyfrakcja promieniowania rentgenowskiego
    izotermy Brunauer Tellers Emmett
    obróbka cieplna
    aktywność fotokatalityczna
    Opis:
    The effect of heat treatment process on crystallite size, phase content, surface area, band gap energy and photocatalytic activity of TiO 2-UV100 nanoparticles were investigated. Heat treated TiO2 nanoparticles were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) isotherm and diffuse reflectance spectroscopy (DRS) techniques, and its photocatalytic activity was investigated in the removal of C.I. Acid Red 88 (AR88), an anionic monoazo dye of acid class, as a model contaminant. Heat treatment process at 600 °C causes an increase in crystallite size and band gap energy of TiO2-UV100 nanoparticles. The results indicate that the nanoparticles treated for 1 h at 600 °C show the highest photocatalytic activity which can effectively degrade AR88 under UV-irradiation. Increasing heat treatment temperature above 600 °C led to reduction in TiO2 photoactivity which may be related to the anatase-rutile phase transformation, increasing particle size and decreasing specific surface area. Removal efficiency of AR88 with heat treated TiO 2-UV100 nanoparticles was sensitive to the operational parameters such as catalyst dosage, pollutant concentration and light intensity.
    Źródło:
    Environment Protection Engineering; 2013, 39, 1; 33-46
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of titanium dioxide/attapulgite composites and their application in treating Reactive Black KN-B wastewater
    Autorzy:
    Xie, A.
    Luo, S.
    Chaoyao, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/207828.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    wastewater treatment
    titanium dioxide
    X ray diffraction
    adsorption capacities
    adsorption kinetics
    Langmuir models
    photocatalytic effect
    oczyszczanie ścieków
    dwutlenek tytanu
    dyfrakcja promieniowania X
    zdolności adsorpcyjne
    kinetyka adsorpcji
    modele Langmuira
    efekt fotokatalityczny
    Opis:
    Removal of water soluble Reactive Black KN-B from aqueous media by means of titanium dioxide/attapulgite (TiO2/ATP) composites was studied in a batch system. The composites were investigated using X-ray diffraction and surface area analysis. Under UV irradiation, the photocatalytic effect of TiO2/ATP composites, pH and reaction temperature on the decolorization rate of Reactive Black KN-B were investigated in detail. The adsorption experiments of TiO2/ATP composites showed that the isotherms and adsorption kinetics were well followed by the Langmuir model and the zero order equation, respectively. The maximum adsorption capacity of TiO2/ATP composites for Reactive Black KN-B calculated by the Langmuir model was 20.08 mg g-1. It can be concluded that the TiO2/ATP composites could be good photocatalysts/adsorbents for treating Reactive Black KN-B wastewater.
    Źródło:
    Environment Protection Engineering; 2014, 40, 1; 45-56
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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