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    Wyświetlanie 1-8 z 8
    Tytuł:
    Preparation and Characterization of ZnO-Zeolite Nanocomposite for Photocatalytic Degradation by Ultraviolet Light
    Autorzy:
    Gayatri, Rianyza
    Agustina, Tuty Emilia
    Bahrin, David
    Moeksin, Rosdiana
    Gustini, Gustini
    Powiązania:
    https://bibliotekanauki.pl/articles/1838249.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    nanocomposite
    ZnO
    synthetic zeolite
    sol-gel
    photocatalytic degradation
    procion red
    Opis:
    The increasing growth of the textile industry does not only provide benefits in the economic sector but also has the potential to damage the environment, because it generates the dye wastewater which is hard to eliminate. Procion red is one of the synthetic textile dyes that is toxic to the aquatic environment and it needs to be processed properly. The photocatalytic method of processing dye wastewater is the most effective, because it can remove the harmful pollutants in the dye wastewater. This study aimed to prepare and characterize the ZnO-Zeolite nanocomposites for photocatalytic applications tested with a 50 mg/L procion red dye sample. The nanocomposites consisted of the ZnO semiconductors and synthetic zeolite adsorbents prepared by using the sol-gel method. The dye degradation test was carried out under the irradiation conditions with ultraviolet (UV) lamp. Apart from the ZnO-Zeolite nanocomposite, testing was also carried out with the synthetic zeolite and ZnO. The results of SEM-EDX and XRD characterization proved that the nanocomposite forming components were ZnO and zeolite and could be seen from the resulting peaks. BET showed that the surface area value of the ZnO-Zeolite nanocomposite increased to 95.98 m2/g, the pore size of the ZnO-Zeolite nanocomposite was 4.42 nm, and the total pore volume was 0.08 cm3/g. The obtained average crystalline size of ZnO-Zeolite nanocomposite was 32.87 nm. The percentage of dye degradation using the ZnO-Zeolite nanocomposite for 120 minutes has reached 90.42%.
    Źródło:
    Journal of Ecological Engineering; 2021, 22, 2; 178-186
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabric Treated with Dye Modified TiO2/Graphene Composite and its Photocatalytic and Self-Cleaning Properties
    Autorzy:
    Wen, Yu-xin
    Bao, Li-hong
    Ling, Jia-wen
    Guan-Fanglan
    Mei, Zhang
    Nie-Jinmei
    Powiązania:
    https://bibliotekanauki.pl/articles/2200765.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    dye modified titanium
    dioxide composite
    graphene composite
    treatment method
    cotton fabric
    photocatalytic self-cleaning
    photocatalytic degradation
    Opis:
    In this paper, a dye modified titanium dioxide/graphene composite (DTG20) was prepared using direct grey D, a dye with good water solubility, as a modifier. Then the DTG20 and its intermediates, including TiO2 and titanium dioxide/graphene (TG), were finished on cotton fabric through the padding, coating and compounding methods, respectively. Photocatalytic properties of the treated fabrics were investigated using the MB simulated pollutant. It was found that the photodegradation efficiency of MB shown by DTG20 finished fabric treated with the compounding method can reach 90.55 %, and after four recycling experiments, the removal rate of MB can still reach 77.07 %. After being exposed to sunlight for 6 hours, the photodegradation efficiency of MB stained on the surface of DTG20 treated fabric can achieve 91.44 %; therefore, it also exhibited an excellent self-cleaning effect.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2022, 5 (151); 53--59
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrometallurgical treatment of non-sulfide zinc ore for precipitation of zinc oxide nanoparticles
    Autorzy:
    Abdel-Aal, E.-S. A.
    Rashad, M. M.
    El-Shazly, A. N.
    Ibrahim, I. A.
    El-Shahat, M. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/110748.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    zinc ore
    sulfuric acid leaching
    filtration rate
    zinc sulfate
    zinc oxide nanoparticles
    MB photocatalytic degradation
    Opis:
    Acid leaching of Egyptian zinc ore from the Um Gheig area was carried out with sulfuric acid. This study determines the optimum conditions for dissolution of non-sulfide zinc ore. The optimum conditions are 25% -74m particle size, 45 °C temperature, 2 h leaching time, 1.1 stoichiometric molar ratio of H2SO4 to Zn, 1:3 solid/liquid ratio. The maximum filtration rate is 1.6 Mg Zn•m-2•day-1at pressure difference of 0.80 bar. The zinc recovery is about 90%. As the zinc ore contains zinc silicate, some additives were tested to enhance filtration and prevent formation of silica gel. To increase the added value of the product, zinc oxide was precipitated by a co-precipitation method in a nanosize powder with average particle size ~ 20 nm. Photocatalytic degradation of methylene blue dye under UV light using ZnO nanopowders produced at different conditions was investigated. Photocatalytic efficiency with methylene blue (MB) concentration was reduced as much as 85% in 240 min with the produced nanoparticles.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 2; 729-737
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photocatalytic degradation of malachite green dye using doped and undoped ZnS nanoparticles
    Autorzy:
    Tolia, J.
    Chakraborty, M.
    Murthy, Z. V. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/779662.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    metoda mechanochemiczna
    zaawansowany proces utlenienia
    degradacja fotokatalityczna
    malachit zielony
    nanocząstki
    mechanochemical method
    advanced oxidation process
    photocatalytic degradation
    malachite green
    nanoparticles
    Opis:
    In the present study, ZnS nanoparticles were prepared using the mechanochemical method. The ZnS nanoparticles prepared were doped with different concentrations of manganese using metal acetate and manganese acetate by mechanochemical method. The as-prepared particles were characterized using X-ray diffraction (XRD) and transmission electron microscopy (TEM). The photocatalytic activity of the prepared nanoparticles samples, in the photocatalytic degradation of malachite green, had been investigated. The nanoparticles were photo induced, generating hole transfer for photocatalytic activity. The photodegradation of malachite green was observed at different pH (2-5) values, dye concentrations (10-100mg/L) and amount of ZnS nanoparticles (1-2.5 g/L). About 95% degradation of dye was observed on the addition of 2 g/L ZnS in 50 mg/L dye solution after 90 minutes illumination at 125 W. Degradation has been increased up to 99% using UV/nanoparticles/H2O2 (50 mL/L) combined process. The degradation efficiency was also compared using Mn doped ZnS nanoparticles (Zn1-x MnxS, where x = 0.01, 0.22 and 0.3). Maximum of 97% degradation was observed with 0.01% concentration of Mn. Kinetics study and performance of UV/ZnS, UV/ZnS/H2O2, UV/doped ZnS processes were evaluated to compare the efficiency of different processes.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 2; 16-21
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Efficient Photocatalytic Degradation of Methyl Orange Dye in an Aqueous Solution by $CoFe_2O_4-SiO_2-TiO_2$ Magnetic Catalyst
    Autorzy:
    Hariani, Poedji Loekitowati
    Said, Muhammad
    Salni, -
    Aprianti, Nabila
    Naibaho, Yohanna Asina Lasma Rohana
    Powiązania:
    https://bibliotekanauki.pl/articles/2025485.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    magnetic
    degradation
    photocatalytic
    methyl orange
    Opis:
    This study successfully synthesized a core-shell-shell in the form of $CoFe_2O_4-SiO_2-TiO_2$ catalyst magnetic and recyclable. The catalyst was employed for the photocatalytic degradation of methyl orange (MO) dye. Subsequently, the catalyst was subjected to XRD, FTIR, SEM-EDS, VSM, as well as UV-DRS characterizations. The photocatalytic degradation was studied as a function of the solution pH, MO concentration, and irradiation time, while the kinetics of photocatalytic degradation and the catalyst reusability were also evaluated. On the basis of the XRD, FTIR, and SEM-EDS characterizations, the $CoFe_2O_4$ coating was successfully carried out using $SiO_2$ and $TiO_2$. $CoFe_2O_4-SiO_2-TiO_2$ was discovered to possess magnetic properties with a saturation magnetization of 17.59 emu/g and a bandgap value of 2.4 eV. The photocatalytic degradation of MO followed the Langmuir-Hishelwood model. The optimum degradation was obtained at the MO concentration of 25 mg/L, solution pH of 4, catalyst dose of 0.05 g/L, irradiation time of 160 minutes, MO removal efficiency achieved 93.46%. The regeneration study showed $CoFe_2O_4-SiO_2-TiO_2$ after 5 cycles were able to catalyze the photocatalytic degradation with an MO removal efficiency of 89.96%.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 1; 118-128
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High performance fluidized bed photoreactor for ethylene decomposition
    Autorzy:
    Rychtowski, Piotr
    Miądlicki, Piotr
    Prowans, Bartłomiej
    Tryba, Beata
    Powiązania:
    https://bibliotekanauki.pl/articles/2106485.pdf
    Data publikacji:
    2022
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    ethylene degradation
    photocatalytic bed reactor
    fluidization
    TiO2
    Opis:
    Removal of C2H4 in the air was carried out in the continuous flow reactor with the photocatalytic bed (expanded polystyrene spheres coated by TiO2 or SiO2/TiO2) under irradiation of UV light. Continuous flow of a gas stream through the reactor was realised at the static bed and under bed fluidization. The required flow of a gas stream through the reactor for bed fluidisation was 500–700 ml/min, whereas for the static bed the flow rate of 20 ml/min was used. Fluidized bed reactor appeared to be much more efficient in ethylene removal than that with the stationary bed. It was caused by the increased speed of C2H4 mass transfer to the photocatalyst surface and better utilization of the incident UV light. In the fluidized bed reactor calculated rate of C2H4 degradation was around 10 μg/min whereas in the stationary state 1.2 μg/min only.
    Źródło:
    Polish Journal of Chemical Technology; 2022, 24, 2; 50--56
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancement photocatalytic activity of spinel oxide (Co, Ni)3O4 by combination with carbon nanotubes
    Autorzy:
    Kahdum, B. J.
    Lafta, A. J.
    Johdh, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/780087.pdf
    Data publikacji:
    2017
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    MWCNT
    spinel oxide
    spinel/CNTs composite
    Bismarck brown G degradation
    photocatalytic activity
    Opis:
    In this study, some types of composites consisting of multi-walled carbon nanotubes (MWCNTs) and spinel oxide (Co, Ni)3 O4  were synthesized by simple evaporation method. These composites were characterized by UV–Vis diffuse reflectance spectroscopy, X-rays diffraction(XRD), Scanning electron microscopy (SEM) and specific surface area(SBET ). The photocatalytic activity of the prepared composites was investigated by the following removal of Bismarck brown G (BBG) dye from its aqueous solutions. The obtained results showed that using MWCNTs in combination with spinel oxide to produced composites (spinel/MWCNTs) which succeeded in increasing the activity of spinel oxide and exhibited higher photocatalytic activity than spinel oxide alone. Also it was found that, multiwalled carbon nanotubes were successful in increasing the adsorption and improving the activity of photocatalytic degradation of Bismarck brown G dye(BBG). The obtained results showed that spinel/MWCNTs was more active in dye removal in comparison with each of spinel oxide and MWCNTs alone under the same reaction conditions. Also band gap energies for the prepared composites showed lower values in comparison with neat spinel. This point represents a promising observation as these composites can be excited using a lower energy radiation sources.
    Źródło:
    Polish Journal of Chemical Technology; 2017, 19, 3; 61-67
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of the water composition on the degradation kinetics of natural organic matter in photocatalytic membrane reactors
    Autorzy:
    Rajca, M
    Powiązania:
    https://bibliotekanauki.pl/articles/208135.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    water hardness
    biological materials
    bioreactors
    degradation
    deionized water
    kinetics
    membranes
    rate constants
    surface water
    first order reactions
    natural organic matters
    photocatalytic process
    twardość wody
    materiały biologiczne
    bioreaktory
    degradacja
    woda dejonizowana
    kinetyka
    membrany
    stałe szybkości
    wody powierzchniowe
    reakcje pierwszego rzędu
    naturalne substancje organiczne
    proces fotokatalityczny
    surface waters
    Opis:
    Decomposition kinetics of natural organic substances during the photocatalytic process with a semi-conductor TiO2 has been investigated. In the study, a laboratory reactor Heraeus and in a photocatalytic membrane reactor were used. Simulated solutions of deionized water, surface water and fulvic acids, differing in composition, were tested in the experiment. In order to determine reaction rate constants, the Langmuir–Hinshelwood kinetic model based on the first order reaction was applied. It was found that photocatalytic process enabled effective degradation of natural organic substances although its run was affected by inorganic ions, mainly those producing water hardness, present in water.
    Źródło:
    Environment Protection Engineering; 2015, 41, 1; 29-39
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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