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    Wyświetlanie 1-7 z 7
    Tytuł:
    The catalytic oxidation of toluene at low temperature over palladium nanoparticles supported on Alumina sphere catalysts : effects of Palladium precursors and preparation method
    Autorzy:
    Pham, Thien Huu
    Than, Ha An Quoc
    Bui, Ha Manh
    Powiązania:
    https://bibliotekanauki.pl/articles/779336.pdf
    Data publikacji:
    2019
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Pd/ Al2O3 spheres
    wet-impregnation
    deposition-precipitation
    catalytic oxidation
    Opis:
    In this study, 1 wt.% Pd/Al2O3 sphere catalysts were prepared using the wet-impregnation (WI) and deposition-precipitation (DP) method using palladium chloride and tetraamminepalladium (II) nitrate as salt precursors. All catalysts were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM) and Fourier-transform infrared (FTIR) spectroscopy. The catalytic activity in toluene oxidation under gas-phase conditions was measured. The obtained results showed that metal dispersion and catalytic activity were strongly dependent on the salt precursor and method of catalyst preparation. The use of tetraamminepalladium (II) nitrate as the precursor presented smaller particle size, an enhanced dispersion and higher specific surface area. Moreover, the catalyst prepared with this precursor also showed higher catalytic activity than that prepared with palladium chloride. At 1 wt.% Pd loading, complete oxidation of toluene was achieved at 250°C. However, there was only approximately 80–90% efficient at the same temperature when the catalyst was prepared with palladium chloride as the precursor.
    Źródło:
    Polish Journal of Chemical Technology; 2019, 21, 4; 48-50
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancing the Productivity of a Roof-Type Solar Still Utilizing Alumina Nanoparticles and Vacuum Pump
    Autorzy:
    Mutlq, Eslam
    Hamdan, Mohammad
    Al Asfar, Jamil
    Powiązania:
    https://bibliotekanauki.pl/articles/124311.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    solar still
    vacuum pump
    nanoparticles
    water desalination
    Opis:
    Unlike conventional fresh water producing systems, from saline or brackish water, the innovative solar water producing systems are efficient and effective. Experiments were conducted on two identical roof-type solar stills and simultaneously tested under the same weather conditions. One of these stills was modified by integrating a vacuum pump to lower the pressure inside while the other still was used as a reference unit. Different concentrations of Al2O3 nanoparticles were chosen, 0.2%, 0.4%, and 0.6%, and used with water inside the modified still. It was verified that the modified still, without nanoparticles, yields 34.84% more production than the conventional still. In addition, the modified still with a 0.4% of Al2O3 nanoparticles produced the highest percentage of distilled water, 44.42% in comparison to the one without the use of Al2O3 nanoparticles, followed by 37.94% and 24.07% for 0.6% and 0.2% of Al2O3 nanoparticles, respectively.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 4; 187-193
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Next generation technology for utilization of alumina rich iron ore tailings in India
    Autorzy:
    Mukopadhyay, Sudipta
    Periyasamy, Muthaimanoj
    Powiązania:
    https://bibliotekanauki.pl/articles/2064366.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    iron ore tailings
    IOTs
    hydrometallurgy
    mineral processing
    iron containing nanoparticles
    ICNs
    odpady przeróbcze rudy żelaza
    hydrometalurgia
    przeróbka surowców mineralnych
    nanocząstki zawierające żelazo
    Opis:
    Accumulation of low-grade iron ore tailings (IOTs) generated during the processing of high-grade iron ore has become a great threat to environment. Although wide range of research works has carried out to recover the iron values from the IOTs, but the solid recovery value has limited to ca. 50% in Indian context. In order to attain a maximum iron recovery and to utilize these solid wastes for future needs, an attention has shed on the topics of hydrometallurgy and applied nanomaterial synthesis from IOTs. Iron containing nanoparticles (ICNs) have huge potential in environmental and energy related applications. A wide range of synthesis methods has developed to produce ICNs from the mine waste. It is evident from the recent research works that converting waste materials into value added products are gaining more attentions. Objective of this review is to analyse the green synthesis routes to prepare ICNs from mine waste, starting from the physio chemical identification of waste material followed by discussion on various methods of ICNs synthesis routes from mine waste. It includes selective leaching method. Finally, the use of ICNs for environmental application had discussed in brief.
    Źródło:
    New Trends in Production Engineering; 2019, 2, 1; 78--85
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ nanotlenku glinu i nanotlenku glinu modyfikowanego kobaltem na mikroorganizmy
    Impact of alumina and cobalt-modified alumina on microorganisms
    Autorzy:
    Mosdorf, P.
    Karwowska, E.
    Kunicki, R. A.
    Karolczak, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1819468.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    nanotlenek glinu
    kobalt
    mikroorganizmy
    nanokompozyty
    alumina nanoparticles
    cobalt
    microorganisms
    Opis:
    Przyczyną zainteresowania nanokompozytami są ich unikatowe właściwości fizyczne i chemiczne oraz rosnąca liczba potencjalnych zastosowań. Wykorzystywane są one w elektronice, ceramice, optyce, technikach laserowych, budownictwie, rolnictwie, medycynie, kosmetyce oraz kosmonautyce. Prowadzone są badania nad zastosowaniem nanomateriałów w nowoczesnych systemach podawania leków, fototerapii czy leczeniu chorób neurodegradacyjnych takich jak choroba Wilsona, Alzhaimera i Parkinsona [2]. Nanocząstki o właściwościach magnetycznych wykorzystywane są w diagnostyce, biologii molekularnej - do etykietowania biomolekuł oraz przy bezpośrednim podawaniu leków do komórek nowotworowych [3], jak również jako środki kontrastowe w rezonansie magnetycznym [1]. Stanowią składniki farb, baterii, środków konserwujących i pielęgnacyjnych, kosmetyków, katalizatorów, materiałów dentystycznych, sorbentów i materiałów ściernych.
    The growing interest in nanostructural materials and their common application in various areas of life and industry, results in their increasing emission into the natural environment. Most of the present research on the influence of nanoparticles on living cells is carried out using animal or cultured human cells. However there are few data concerning the impact of nanoproducts on microorganisms isolated from the natural environment. The aim of this work was to determine the influence of alumina nanopowder as well as cobalt-modified alumina nanopowder on bacteria isolated from soil, water and air samples. The growth tests allowed to observe that Co-modified alumina nanopowder revealed the stronger antibacterial activity com-paring with alumina without modification. The strains of soil bacteria were the most sensitive to both tested nanopowders, especially to CoO/Al2O3. The growth of 93% of bacteria isolated from soil samples was inhibited by cobalt-modified alumina nanopowder, but only about 20% - by alumina without modification (mainly gram negative rods from genus Pseudomonas). Bacteria isolated from the air, especially from genus Staphylococcus were the less sensitive to alumina nanoparticles. However some of them were sensitive to cobaltmodified alumina nanopowder. It was noticed that in low concentration of nanoproduct, some adaptation processes, allowing bacteria to grow in a presence of nanopowder may be observed, even in case of cobalt-modified alumina characterized by more significant antibacterial properties. Moreover, the sensitivity to tested preparations was attributed to the particular bacterial strains, that was proved by different results obtained for the various strains of the same bacterial species.
    Źródło:
    Rocznik Ochrona Środowiska; 2011, Tom 13; 1635-1651
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative assessment of Al2O3 modified biomasses from agricultural residues for nickel and cadmium removal
    Autorzy:
    Herrera-Barros, Adriana
    Tejada-Tovar, Candelaria
    Gonzalez-Delgado, Angel D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1844335.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    adsorption
    agricultural residues
    alumina nanoparticles
    cellulose
    heavy metal ions
    Opis:
    The biodiversity of aqueous environments has been affected due to the disposal of wastewater highly contaminated with heavy metal ions, causing much damage to ecosystems. These pollutants are very toxic and bioaccumulate in living organisms. This work attempts to evaluate the adsorption of nickel ad cadmium ions using three biomasses from agricultural residues (corn cob – CC, orange peel – OP, and oil palm bagasse – PB) modified with alumina nanoparticles. The biomasses were characterized via compositional analysis and a point of zero charges to quantify the presence of lignin, cellulose, hemicellulose, and the feasible pH, taking advantage of the biomass charge. After modification with Al2O3 nanoparticles. The resulting adsorbents were characterized via FT-IR analysis to identify the functional groups that most contributed to the adsorption performance. Furthermore, the influence of Al2O3 nanoparticles was analysed on the adsorption capacities of the evaluated biomasses using batch systems at a temperature of 25°C and pH 6. All biomasses displayed a high content of cellulose, estimating a weight percentage of about 19.9%, 14.3%, and 13.1% for PB, OP, and CC samples, respectively. The FT-IR spectrum confirmed hydroxyl and carboxyl functional groups, which contribute to enhancing the adsorption capacities of the modified biomasses. Functional adsorption capacity was observed for all biomasses after modification with Al2O3 nanoparticles, achieving at pH 6.0 a cadmium removal from 92% (CC-Al2O3 and PB-Al2O3) up to 95.8±0.3% (OP-Al2O3). In nickel ions, it was estimated a broader adsorption capacity at pH 6.0 of about 86±0.4% after using the CC-Al2O3 sample, 88±0.1% for the PB-Al2O3 adsorbent, and 98±0.2% for the OP-Al2O3 sample, confirming the suitability of these Al2O3-modified biomasses for the removal of heavy metal ions.
    Źródło:
    Journal of Water and Land Development; 2021, 49; 29-34
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of hexavalent chromium from aqueous solution by adsorption on γ-alumina nanoparticles
    Autorzy:
    Golestanifar, H.
    Haibati, B.
    Amini, H.
    Dehghani, M. H.
    Asadi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/207945.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    adsorption
    alumina
    aluminum
    chemicals removal
    water treatment
    chromium
    chromium compounds
    nanoparticles
    sorption
    alumina nanoparticles
    hexavalent chromium
    adsorpcja
    aluminium
    usuwanie chemikaliów
    uzdatnianie wody
    chrom
    związki chromu
    nanocząstki
    sorpcja
    nanocząstki tlenku glinu
    chrom sześciowartościowy
    Opis:
    The use of γ-alumina (γ-Al2O3) nanoparticles as adsorbent to remove Cr(VI) from aqueous solution was investigated using batch experiments. Adsorption experiments were carried out for various initial doses of Al2O3, initial concentrations of chromium(VI), contact times and pH. The structure and morphology of the sorbent was characterized by XRD, SEM, and TEM techniques. Results demonstrated that the removal efficiency of chromium(VI) was increased by increasing the contact time, initial concentration, and pH. The results of the study showed that adsorption of chromium by γ-alumina nanoparticles reached equilibrium after 60 min and after that a little change of chromium removal efficiency was observed. Furthermore, kinetics of chromium sorption was well fitted by pseudo-second order kinetic model, and well explained by the Freundlich isotherm (R2 > 0.992). Overall, alumina nanoparticles recognized as an effective sorbent to remove chromium(VI) from aqueous solutions.
    Źródło:
    Environment Protection Engineering; 2015, 41, 2; 133-145
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigating the effects of alumina nanoparticles on the impact resistance of polycarbonate nano-composites
    Autorzy:
    Alavi Nia, Ali
    Amirchakhmaghi, Saeed
    Powiązania:
    https://bibliotekanauki.pl/articles/27309841.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    nanoparticles
    alumina
    ballistic test
    nano-composite
    polycarbonates
    surface treatments
    nanocząstki
    glinka
    próba balistyczna
    nanokompozyt
    poliwęglany
    obróbka powierzchni
    Opis:
    In this project, two types of treated and untreated alumina nanoparticles with different weight percentages (wt%) of 0.5, 1 and 3% were mixed with polycarbonate matrix; then, the impact ballistic properties of the nano-composite targets made from them were investigated. Three types of projectile noses -cylindrical, hemispherical, and conical, each with the same mass of 5.88 gr – were used in the ballistic tests. The results highlighted that ballistic limit velocities were improved by increasing the percentage of alumina nanoparticles and the treatment process; changing the projectile’s nose geometry from conical to blunt nose increases the ballistic limit velocity, and ultimately, by increasing the initial velocity of conical and hemispherical nosed projectiles, the failure mechanism of the targets changed from dishing to petalling; whereas for the cylindrical projectile, the failure mode was always plugging.
    Źródło:
    Archive of Mechanical Engineering; 2022, LXIX, 3; 431--454
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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