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    Wyświetlanie 1-9 z 9
    Tytuł:
    Effect of Magnetite Oxide Nanoparticles and Tungsten Oxide Nanoparticles on Phosphate Removal from Aqueous Solutions
    Autorzy:
    EL-Baz, Amro
    Mokhtar, Mona
    Abdo, Ahmed
    Powiązania:
    https://bibliotekanauki.pl/articles/24201790.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    phosphate removal
    nanoparticles
    Fe3O4 NPs
    WO3 NPs
    adsorption
    desorption
    Opis:
    Phosphate (P) removal from aqueous solutions were studied by a new mineral adsorbent, tungsten (VI) oxide (WO3) nanoparticles (NPs), which has not been the subject of much research in the field of removing P contaminants from agricultural wastewater. In this paper, P was removed from aqueous solutions by a new mineral adsorbent, WO3 NPs and it was compared with magnetite (iron IV) oxide (Fe3O4) nanoparticles (NPs) under the same ambient operating conditions i.e., The influence of the dosage of adsorbents, initial P concentration, contact time, pH and temperature. The values that achieved the best removal were recorded. It was concluded that the best limits for pH were at 2–3, contact time at 40 minutes, temperature at 45 °C and adsorbent dose at 1.0 g/L. Best results of the variables were applied on samples of real agricultural wastewater, which achieved removal ratio of 77.3% and 75.42% for Fe3O4 and WO3 NPs, respectively. SEM, EDX and FTIR images and analyses were conducted to describe the characteristics of nano-adsorbents used before and after P adsorption in aqueous solutions. The P adsorption kinetics for aqueous solutions were examined by fitting results of the experiment to both the first & second pseudo-kinetically models. The outcome indicated that kinematic data fit better with pseudo-second-order kinetic models. Moreover, the information captured from equilibrium adsorption was analyzed using isothermal methods (by Langmuir & Freundlich Forms). Their results showed that the Freundlich form is considered more suitable than Langmuir form in analyzing the biosorption of P ions. The thermodynamic demeanor of P adsorption by Fe3O4 and WO3 NPs was analyzed and evaluated, and the thermodynamic data analyses confirmed the process of P adsorption was spontaneous. The ΔG° value was negative, while ΔH° and ΔS° values found to be positive, which means that the adsorption of P was a spontaneous, random and endothermic operation. In general, Fe3O4 and WO3 nanoparticles had a high efficiency in removing phosphate from water. In addition, WO3 NPs has been identified as one of the most promising adsorbents due to its rapid and effective adsorption of pollutants.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 3; 287--303
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photocatalytic degradation of ampicillin using silver nanoparticles biosynthesised by Pleurotus ostreatus
    Autorzy:
    Jassal, P.S.
    Khajuria, R.
    Sharma, R.
    Debnath, P.
    Verma, S.
    Johnson, A.
    Kumar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2096973.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ampicillin
    FTIR
    photocatalysis
    silver nanoparticles (Ag-NPs)
    TEM
    Opis:
    The past few decades have witnessed a tremendous increase in the consumption of antibiotics worldwide. This rampant and unregulated use of antibiotics and their improper disposal has led to the accumulation of these drugs in the environment. This in turn has led to the emergence of antibiotic resistance in microbes and has become one of the most pressing global concerns in medicine, with highly resistant pathogens of many species proving difficult to treat. The aim of the study was to synthesise silver nanoparticles (Ag-NPs) using white rot fungus, Pleurotus ostreatus and assess its potential to carry out photocatalytic degradation of ampicillin. UV–Vis spectroscopy, Fourier transform infrared spectroscopy and transmission electron microscope have been used to characterize biosynthesized Ag-NPs. The photocatalytic degradation of ampicillin in aqueous solution by Ag-NPs was evaluated under natural sunlight. The effect of the operating conditions (contact time, Ag-NP concentration and initial ampicillin concentration) on the photocatalytic degradation was also investigated. The highest ampicillin degradation of 96.5% was observed after exposure of the solution (antibiotic + nanoparticles) for 4 h in sunlight. The maximum degradation was observed at an Ag-NP concentration of 5 ppm at pH 6. To the best of our knowledge, photocatalytic degradation of ampicillin using Ag-NPs synthesised by P. ostreatus has not been reported earlier.
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2020, 101, 1; 5-14
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of an optical catalyst for cracking contaminating dyes in the wastewater of factories using indium oxide in nanometer and usage in agriculture
    Autorzy:
    Ahmed, Ishaq F. E.
    El-Shenawy, Ahmed I.
    Refat, Moamen S.
    Powiązania:
    https://bibliotekanauki.pl/articles/778735.pdf
    Data publikacji:
    2019
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Photocatalyst
    In2O3
    precursors
    Crystal Violet
    Congo Red
    NPs
    Opis:
    Herein, the photocatalytic degradation of the Congo Red (CR) and Crystal Violet (CV) dyes in an aqueous solution were discussed in the presence of an indium(III) oxide (In2O3) as optical catalyst efficiency. The caproate bidentate indium(III) precursor complex has been synthesized and well interpreted by elemental analysis, molar conductivity, Fourier transform infrared (FT-IR), UV-Vis, and thermogravimetric (TGA) with its differential thermogravimetric (DTG) studies. The microanalytical and spectroscopic assignments suggested that the associated of mononuclear complex with 1:3 molar ratio (M3+:ligand). Octahedral structure is speculated for this parent complex of the caproate anion, CH3(CH2)4COO− ligand. The In2O3  NPs with nanoscale range within 10–20 nm was synthesized by a simple, low cost and eco-friendly method using indium(III) caproate complex. Indium oxide nanoparticles were formed after calcination of precursor in static air at 600°C for 3 hrs. The structural, grain size, morphological and decolorization efficiency of the synthesized NPs were characterized using the FT-IR, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and transmission electron microscopy (TEM) analyses. It was worthy mentioned that the prepared In2O3  NPs showed a good photodegradation properties against CR and CV organic dyes during 90 min.
    Źródło:
    Polish Journal of Chemical Technology; 2019, 21, 4; 98-105
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of incomplete data handling techniques for neuro-fuzzy systems
    Autorzy:
    Sikora, M.
    Simiński, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/305722.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    incomplete data
    marginalization
    imputation
    neuro-fuzzy system
    ANNBFIS
    PDS
    IFCM
    OCS
    NPS
    Opis:
    Real-life data sets sometimes miss some values. The incomplete data needs specialized algorithms or preprocessing that allows the use of the algorithms for complete data. The paper presents a comparison of various techniques for handling incomplete data in the neuro-fuzzy system ANNBFIS. The crucial procedure in the creation of a fuzzy model for the neuro-fuzzy system is the partition of the input domain. The most popular approach (also used in the ANNBFIS) is clustering. The analyzed approaches for clustering incomplete data are: preprocessing (marginalization and imputation) and specialized clustering algorithms (PDS, IFCM, OCS, NPS). The objective of our research is the comparison of the preprocessing techniques and specialized clustering algorithms to find the the most-advantageous technique for handling incomplete data with a neuro-fuzzy system. This approach is also the indirect validation of clustering.
    Źródło:
    Computer Science; 2014, 15 (4); 441-458
    1508-2806
    2300-7036
    Pojawia się w:
    Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimizing the acquisition cost of input data for daily National Power System load forecasts using automated statistical methods
    Optymalizacja kosztów zakupu danych wejściowych do prognoz dobowego obciążenia KSE przy wykorzystaniu zautomatyzowanych metod statystycznych
    Autorzy:
    Czapaj, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/396982.pdf
    Data publikacji:
    2017
    Wydawca:
    ENERGA
    Tematy:
    obciążenie KSE
    zapotrzebowanie mocy KSE
    prognozy średnich wartości godzinowych
    zmienne objaśniające
    parametry wejściowe
    parametry meteorologiczne
    metody statystyczne
    data mining
    NPS load
    NPS power demand
    hourly average forecasts
    explanatory variables
    input parameters
    meteorological parameters
    statistical methods
    Opis:
    The paper presents the possibility of using statistical methods to automate the selection of explanatory variables to balance the daily load of the National Power System (NPS). With automation, the cost of input forecast purchase may be optimized by minimizing their number, and the results also allow for a reduction in the effort required to select input parameters (explanatory variables) for later forecasting of NPS daily loads.
    Artykuł prezentuje możliwość skorzystania z metod statystycznych automatyzujących dobór zmiennych objaśniających na przykładzie dobowego obciążenia Krajowego Systemu Elektroenergetycznego (KSE). Automatyzacja pozwala na optymalizację kosztów zakupu prognoz wejściowych dzięki minimalizacji ich liczby, a uzyskane wyniki pozwalają dodatkowo na zmniejszenie nakładów pracy związanych z wyborem parametrów wejściowych (zmiennych objaśniających) na potrzeby późniejszego opracowywania prognoz dobowego obciążenia KSE.
    Źródło:
    Acta Energetica; 2017, 3; 37-42
    2300-3022
    Pojawia się w:
    Acta Energetica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The idea of increasing the NPS operational flexibility by reallocating the secondary reserve band to wind power plants
    Koncepcja zwiększenia elastyczności pracy KSE poprzez realokację pasma rezerwy wtórnej na elektrownie wiatrowe
    Autorzy:
    Czarnecki, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/397582.pdf
    Data publikacji:
    2017
    Wydawca:
    ENERGA
    Tematy:
    daily balancing of NPS
    wind turbine
    Centrally Dispatched Generating Unit (CDGU) operation
    dobowe bilansowanie KSE
    siłownia wiatrowa
    uruchomienia JWCD
    Opis:
    The paper presents a concept of the reallocation of the secondary regulation half-band towards decreasing the generation output in off-peak hours, from centrally-dispatched generating units (CDGU) to wind turbines. The proposed new regulation service’s operating mechanism is discussed and the following potential benefits of its implementation identified: 1. improvement of the National Power Systems (NPS) operation’s security and reliability 2. avoidance of daily CDGU restarts due to spinning reserve shortage 3. avoidance of wind farms’ deep preventive output curtailments 4. increase of long-term CDGU availability/reliability 5. reduction of the NPS operating costs.
    W artykule przedstawiono koncepcję realokacji w godzinach pozaszczytowych półpasma regulacji wtórnej w kierunku zmniejszania generacji z jednostek wytwórczych centralnie dysponowanych (JWCD) na elektrownie wiatrowe. Omówiono mechanizm działania proponowanej nowej usługi regulacyjnej oraz wskazano na potencjalne korzyści z jej wdrożenia w postaci: 1. poprawy bezpieczeństwa i niezawodności pracy Krajowego Systemu Elektroenergetycznego (KSE) 2. unikania odstawień i ponownych uruchomień JWCD ze względu na niedostatek rezerwy wirującej 3. unikania głębokiego prewencyjnego zaniżania mocy elektrowni wiatrowych 4. poprawy długookresowej dyspozycyjności JWCD 5. w konsekwencji obniżenia kosztów funkcjonowania KSE i zwiększenia długookresowej dyspozycyjności JWCD.
    Źródło:
    Acta Energetica; 2017, 3; 49-53
    2300-3022
    Pojawia się w:
    Acta Energetica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zinc and nano-ZnO – influence on living organisms
    Autorzy:
    Mielcarz-Skalska, L.
    Smolińska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/410473.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Łódzka. Wydawnictwo Politechniki Łódzkiej
    Tematy:
    zinc
    nano-ZnO influence on organisms
    nano-zinc
    zinc NPs ecotoxicity
    cynk
    wpływ cynku na organizm
    nanotlenek cynku
    nanocząsteczki cynku
    Opis:
    The use of zinc is very common in many industries. The multitude of advantages, and capabilities make use of different forms of penetration of zinc into the environment. Due to its ability to migrate, zinc is also accumulated in living organisms. Zn is an essential trace element but both the deficiency or excess are extremely dangerous for living organisms. Nowadays nanozinc has been increasingly used. Nanozinc is a component of daily used products, like plastics, ceramics, glass, cement, rubber, foods and many others. This leads to spreading nanozinc the environment with the possibility of its penetration into living organisms. This article is a review of the impact of zinc and zinc nanoparticles on a variety of organisms: ranging from microorganisms through plants and animals, to people.
    Źródło:
    Biotechnology and Food Science; 2017, 81, 2; 93-102
    2084-0136
    2299-6818
    Pojawia się w:
    Biotechnology and Food Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zinc oxide nanoparticles as photo-catalytic and anti-bacterial pigment for alkyd resin based coating
    Autorzy:
    Kavitha Sri, A.
    Sivaraj, M.
    Rajkumar, S.
    Ruby Shelin, A.
    Sajitha, L.P.
    Jeyasubramanian, K.
    Jeen Robert, R.B.
    Hikku, G.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/24200597.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    ZnO NPs
    photocatalytic pigment
    anti-bacterial pigment
    alkyd resin coating
    self-cleaning surface
    pigment fotokatalityczny
    pigment antybakteryjny
    powłoka z żywicy alkidowej
    powierzchnia samoczyszcząca
    Opis:
    Purpose: Recently, there has been an upsurge among people around the world in maintaining a sustainable and hygienic environment. This is due to the over-exploitation of recourses causing environmental pollution and spreading bacterial infections. In this regard, scientists are motivated to develop smart coatings where environmental pollutants and bacterial cells are degraded when in contact with their surfaces. Design/methodology/approach: In our previous report, ZnO nanoparticles (NPs) were prepared using the precipitation technique, showing good photocatalytic and antibacterial activity [1]. In this context, the present study details the use of ZnO NPs as pigment for the fabrication of alkyd resin-based self-cleaning coating. The coating was developed by mixing ZnO NPs and alkyd resin along with the additives using the ball milling technique. The developed coating was characterized using field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, atomic force microscopy, and water contact angle measurements. Findings: To elucidate the self-cleaning and hygienic behaviour of the ZnO/alkyd resin coating, the dried coating was exposed to crystal violet (CV) solution as a model dye pollutant and bacterial strains to assess its photocatalytic and antibacterial activity. The droplets of CV solution placed over the coating almost degraded after 360 min of exposure to sunlight owing to the presence of ZnO NPs in the coating. Further, the coating exhibits reasonable antibacterial activity against E. coli and P. aeruginosa whereas it displays low antibacterial activity against S. aureus. Research limitations/implications: Even though, the self-cleaning coating shows promising results, tuning the activity of the photo-catalytic pigment can improve the pollutant degradation efficiency and elevate bactericidal activity. Originality/value: ZnO NPs-impregnated alkyd resin coating for self-cleaning applications is novel.
    Źródło:
    Archives of Materials Science and Engineering; 2022, 118, 1; 29--35
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The role of TiO2 NPs catalyst and packing material in removal of phenol from wastewater using an ozonized bubble column reactor
    Autorzy:
    Alattar, Saja A.
    Sukkar, Khalid A.
    Alsaffar, May A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2201970.pdf
    Data publikacji:
    2023
    Wydawca:
    Centrum Badań i Innowacji Pro-Akademia
    Tematy:
    petroleum refineries
    phenol degradation
    TiO2 NPs
    multiphase flow reactor
    catalytic ozonation reaction
    rafinerie ropy naftowej
    degradacja fenolu
    TiO2
    nanocząsteczki
    reaktor przepływowy wielofazowy
    katalityczna reakcja ozonowania
    Opis:
    Phenol is present as a highly toxic pollutant in wastewater, and it has a dangerous impact on the environment. In the present research, the phenol removal from wastewater has been achieved using four treatment methods in a bubble column reactor (treatment by ozone only, using packed bubble column reactor with ozone, utilizing ozone with TiO2 NPs catalyst in the reactor without packing, and employing ozone with TiO2 NPs in the presence of packing). The effects of phenol concentration, ozone dosage, TiO2 NPs additions, and contact time on the phenol removal efficiency were determined. It was found that at a contact time of 30 min, the phenol removal was 60.4, 74.9, 86.0, and 100% for the first, second, third, and fourth methods, respectively. The results indicated that the phenol degradation method using catalytic ozonation in a packed bubble column with TiO2 NPs is the best treatment method. This study demonstrated the advantages of using packing materials in a bubble column reactor to enhance the mass transfer process in an ozonation reaction and then increase the phenol removal efficiency. Also, the presence of TiO2 NPs as a catalyst improves the ozonation process via the production of hydroxyl routs. Additionally, the reaction kinetics of ozonation reaction manifested that the first order model is more applicable for the reaction. Eventually, the packed bubble column reactor in the presence of TiO2 NPs catalyst provided a highperformance removal of phenol with a high economic feasibility.
    Źródło:
    Acta Innovations; 2023, 46; 93--105
    2300-5599
    Pojawia się w:
    Acta Innovations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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