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    Wyświetlanie 1-3 z 3
    Tytuł:
    Removal of Fouling from Steel Plate Surfaces Based on Multi-Frequency Eco-Friendly Ultrasonic Guided Wave Technology
    Autorzy:
    Huang, Mingkun
    Jin, Shuo
    Nie, Gaoqian
    Wang, Xiaopeng
    Zhang, Quanpeng
    An, Yang
    Qu, Zhigang
    Yin, Wuliang
    Powiązania:
    https://bibliotekanauki.pl/articles/31339786.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    fouling removal
    cavitation
    eco-friendly
    ultrasonic guided waves
    multi-frequency
    Opis:
    Fouling is inevitable on the surfaces of industrial equipment, especially on heat-exchanging surfaces in contact with fluids, which causes water pollution and destroys the ecological environment. In this paper, a novel fouling-removal methodology for plate structure based on cavitation by multi-frequency ultrasonic guided waves is proposed, which can remove fouling on stainless steel plates. A numerical simulation method has been developed to study the acoustic pressure distribution on a steel plate. According to the simulation results, the distribution of sound pressure on the plate under triple-frequency excitation is denser and more prone to cavitation than in single-frequency cases and dual-frequency cases, which improves fouling removal rate. The stainless steel plate is immersed in water for the descaling experiment, and the results show that the fouling removal rates of three water-loaded stainless steel plates under different single-frequency excitation seem unsatisfactory. However, the multi-frequency excitation improves the descaling performance and the removal rate of fouling reaches 80%. This new method can be applied to the surface descaling of large equipment plates, which is of great significance for purifying water quality and protecting the ecological environment.
    Źródło:
    Archives of Acoustics; 2023, 48, 4; 593-601
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Silica ash from waste palm fronds used as an eco-friendly, sustainable adsorbent for the Removal of cupper (II)
    Autorzy:
    Al-Qadri, Fatima A.
    Alsaiari, Raiedhah
    Powiązania:
    https://bibliotekanauki.pl/articles/27311556.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    Cupper (II) adsorption
    palm frond waste ash
    silica
    krzem
    krzemionka
    popiół
    liście palmowe
    Opis:
    This study describes the creation of a low-cost silica material using a silicate extract as a precursor. This precursor is made from inexpensive palm frond waste ash through a simple calcination process at 500°C and a green extraction with water. Nitrogen adsorption-desorption, FTIR analyses, and transmission electron microscopy were used to characterize the samples. The surface area of the obtained mesoporous silica ash material was 282 m2/g1, and the pore size was 5.7 nm. For the adsorption of copper ions, an excellent adsorbent was obtained. The maximum copper ion adsorption capacity of this inexpensive silica ash-based adsorbent for removing heavy metal ions Cu(II) from aqueous solutions was 20 mg/g, and the eff ect of pH, temperature, and time on its adsorption capacity were also investigated. In addition, The adsorption isotherms were fi tted using Langmuir and Freundlich models, and the adsorption kinetics were evaluated using pseudo-first-order and pseudo-second-order models The results demonstrated that the synthesized adsorbent could effectively remove heavy metal ions from aqueous solutions at pH levels ranging from 2 to 5. The adsorption isotherms followed the Langmuir model, and the kinetic data fit the pseudo-second-order mode well. The thermodynamic results Negative values of G° indicate that the adsorption process was spontaneous, and negative values of entropy S° indicate that the state of the adsorbate at the solid/solution interface became less random during the adsorption process. According to the findings, prepared silica from palm waste ash has a high potential for removing heavy contaminating metal ions Cu (II) from aqueous solutions as a low-cost alternative to commercial adsorbents.
    Źródło:
    Archives of Environmental Protection; 2023, 49, 2; 30--39
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative analysis of natural nanosilica versus commercial nanosilica on compressive strength and durability of high-performance concrete
    Autorzy:
    Tjahjani, A.R. Indra
    Fulazzaky, Mohamad Ali
    Jonbi, Jonbi
    Tinumbia, Nuryani
    Meutia, Wita
    Suraedi, Daral
    Ranna, Prima
    Powiązania:
    https://bibliotekanauki.pl/articles/27312142.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    nanokrzemionka
    materiał naturalny
    materiał komercyjny
    wytrzymałość na ściskanie
    trwałość
    beton wysokiej wytrzymałości
    materiał ekologiczny
    natural material
    commercial material
    nanosilika
    compressive strength
    durability
    high performance concrete
    eco-friendly material
    Opis:
    This study provides a comparative analysis of natural nanosilica (NSn), which is an extract of natural silica sand processed into nanosilica with commercial nanosilica (NSc) derived from semiconductor industrial waste, in 80 MPa high performance concrete (HPC). The percentage of using nanosilica is (3%, 5%, 10%, 15%) by weight of cement used directly and combined with 5% silica fume. Analysis was carried out through compressive strength test, durability through permeability test, rapid chloride penetration test (RCPT), and microstructure test through scanning electron microscopy (SEM). The results of the analysis show that natural nanosilica is equivalent to commercial nanosilica, in applications it is better to use silica fume incorporation. The optimum percentage of using NSn10% and (SF) 5%, while 5% NSc and 5% SF, in these proportions shows the best compressive strength and durability. It’s just that the use of natural nanosilika is 5% more than commercial nanosilika. The benefit of this research is that natural materials such as silica sand with high SiO2 content, can be processed into nanosilica as an advanced material, which can be used as an eco-friendly construction material.
    Źródło:
    Archives of Civil Engineering; 2023, 69, 3; 49--63
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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