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    Tytuł:
    Efficient removal of imidacloprid pesticide by two eco-friendly activated carbons
    Autorzy:
    Mohammad, Somaia Gaber
    El-Refaey, Ahmed A.
    Powiązania:
    https://bibliotekanauki.pl/articles/27312663.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    activated carbon
    hazelnut
    imidacloprid
    pesticide
    regeneration
    removal
    walnut
    Opis:
    In this study, the removal of imidacloprid (IMD) pesticide onto activated carbon produced from nut shells of hazelnut (HAC), and walnut (WAC) has been investigated. The prepared activated carbons were characterised by total carbon, nitrogen and hydrogen content, surface areas and pore volume. Fourier-transform infrared (FTIR), and scanning electron microscopy (SEM) were studied before and after adsorption experiments. Effects of adsorbent dose (0.02-0.2 g), contact time (10-120 min), initial imidacloprid concentration (10-100 mg∙dm-3), and pH (1-8), and temperatures (25-50°C) on the removal of IMD pesticide by HAC and WAC in the batch mode were studied. The removal percentage of imidacloprid pesticide by HAC and WAC was 93.79% and 94.72%, respectively. The study showed that the pseudo-second-order kinetics model fitted well for both activated carbons. Moreover, adsorption isotherm results were evaluated using Freundlich, Langmuir and Temkin isotherm models. The adsorption results correlated well with the Langmuir isotherm model (R2 = 0.987 and 0.964) with maximum adsorption capacities of 76.923 and 83.333 mg∙g-1 for HAC and WAC, respectively, and an equilibrium time within 120 min. The nature of the adsorption of imidacloprid pesticide onto HAC and WAC is exothermic, spontaneous and physical in nature. The two prepared activated carbons (HAC, WAC) were successfully regenerated for three cycles and could be used as an effective and low-cost adsorbent for the removal of IMD pesticide from aqueous solutions. The production of the activated carbons of HAC and WAC will provide minimisation of these wastes in the environment.
    Źródło:
    Journal of Water and Land Development; 2023, 57; 220--230
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Basic Principles and Mechanical Considerations of Satellites: A Short Review
    Autorzy:
    Reda, Reham
    Ahmed, Yasmeen
    Magdy, Islam
    Nabil, Hossam
    Khamis, Mennatullah
    Refaey, Ahmed
    Eldabaa, Nada
    Abo Elmagd, Manar
    Abo Lila, Mohamed
    Ergawy, Hady
    Elgarf, Alhussein
    Abed, Gerges
    Powiązania:
    https://bibliotekanauki.pl/articles/36827035.pdf
    Data publikacji:
    2023
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    principles of satellites
    primary structure
    isogrid structure
    honeycomb structure
    mechanical load analysis
    assembly
    integration
    testing
    Opis:
    Satellites are used for navigation, communication, oceanography, astronomy, etc.. Satellites come in a diversity of sizes and forms. Depending on the satellite’s mission, different subsystems are used. These subsystems are installed inside a housing to protect them from the space environment. This housing, which is also known as the satellite primary structure or mechanical structure, is made of durable materials that can endure severe conditions during launch and in the orbit. The optimisation of satellite mass is crucial right now since satellites are losing mass every day to reduce the cost of manufacturing and launching. This review first introduces an overview of the satellite classifications and subsystems. Then, the different types of mechanical load analysis the satellite subjects itself to are demonstrated. The advanced approaches for promoting the performance of the mechanical structures of satellites are explored, with a spotlight on the effect of the optimisation parameters of isogrid and honeycomb sandwich structures on the mechanical performance of the satellite primary structure. The assembly, integration and testing (AIT) of the small satellite are briefly presented. Finally, the important potential designs to improve the mechanical performance of the satellite primary structure and the challenges of further research are summarised.
    Źródło:
    Transactions on Aerospace Research; 2023, 3 (272); 40-54
    0509-6669
    2545-2835
    Pojawia się w:
    Transactions on Aerospace Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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