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    Wyświetlanie 1-4 z 4
    Tytuł:
    Spatial distribution of manganese and iron in sediments of the Czorsztyn Reservoir
    Autorzy:
    Czaplicka, A.
    Bazan, S.
    Szarek-Gwiazda, E.
    Ślusarczyk, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/208074.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    dam water
    metal pollution
    Czorsztyn
    zapora wodna
    zanieczyszczenie metalami
    żelazo
    mangan
    Opis:
    Concentrations of iron and manganese were investigated in 26 sediment samples from the Czorsztyn Reservoir (South Poland). Spatial distribution of these metals in the reservoir is generally linked to the grain size distribution of sediments. The presence of manganese and iron in sediments is mainly related to the rock weathering and soil erosion processes. Furthermore, enrichment of waters in manganese and iron follows as a result of the Dunajec River flowing through the Orawsko-Nowotarska Valley, where peat bogs are present. However, anthropogenic influence on manganese and iron concentration levels in sediments cannot be excluded in this area.
    Źródło:
    Environment Protection Engineering; 2016, 42, 4; 179-188
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrasonic-assisted synthesis of reactive carboxymethyl cellulose stabilized nano zero-valent iron and its application for removal of Cr6+ and Cu2+ ions
    Autorzy:
    Ayob, A.
    Santiagoo, R.
    Amneera, W. A.
    Ismail, N.
    Abdullah, A. Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/207403.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    high resolution transmission
    electron microscopy
    light scattering
    transmission electron microscopy X ray diffraction
    zero-valent iron
    wysoka rozdzielczość transmisyjna
    mikroskopia elektronowa
    dyfrakcja rentgenowska
    żelazo
    Opis:
    Carboxymethyl cellulose (CMC) was used in the chemical reduction using sodium borohydride to yield dispersive nano zero-valent iron (nZVI) particles as reactive and stable adsorbents. CMC- -stabilized nZVI particles were characterized via UV-visible light spectroscopy, X-ray diffraction, dynamic light scattering, transmission electron microscopy, and specific surface area assisted using a probe ultrasonication dispersing tool at 50% amplitude power. High catalytic reactivity obtained in pseudo-first order reaction for Cr6+ (rate constant K1 = 0.0311 min–1) and pseudo-second order for Cu2+ (rate constant K2 = 0.0946 g·mg–1·min–1) indicated that colloidal stability of nZVI particles can be achieved with a stabilizer for the removal of toxic contaminants.
    Źródło:
    Environment Protection Engineering; 2016, 42, 2; 55-79
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Degradations of 2,4-dichlorophenol and polychlorinated biphenyls with zero valent iron under subcritical conditions. Importance of subcritical water oxidation
    Autorzy:
    Oh, S.-Y.
    Yoon, M.-K.
    Powiązania:
    https://bibliotekanauki.pl/articles/207444.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chemicals removal
    water treatment
    degradation
    gas chromatography
    iron
    mass spectrometry
    organic pollutants
    polychlorinated biphenyls
    2,4-dichlorophenol
    DCP
    polychlorinated biphenyl
    PCBs
    usuwanie chemikaliów
    uzdatnianie wody
    degradacja
    chromatografia gazowa
    żelazo
    spektrometria masowa
    zanieczyszczenia organiczne
    polichlorowane bifenyle
    PCB
    2,4-dichlorofenol
    Opis:
    The abiotic transformations of 2,4-dichlorophenol (DCP) and polychlorinated biphenyls (PCBs) has been examined in the presence and of zero valent iron (Fe(0)) under subcritical conditions. It was found that the degradation of DCP was significantly enhanced, showing complete degradation of DCP in 3 h at 300 °C. Control experiments without Fe(0) indicated that the removal of DCP in the iron–water system was mostly due to subcritical water oxidation and that the enhancement of degradation in the presence of Fe(0) was less significant. Regardless of Fe(0), PCBs were rapidly decomposed, showing 93% destruction in 5 h at 300 °C. Product identification by gas chromatography-mass spectrometry (GC-MS) analysis showed that the reductive transformation of DCP and PCBs w Fe(0) existed under subcritical conditions. Our results suggest that subcritical water degradation may be a possible remediation option to treat DCP and PCBs in water and soil.
    Źródło:
    Environment Protection Engineering; 2015, 41, 3; 73-86
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zero-valent iron for removal of inorganic contaminants from low pH water
    Autorzy:
    Suponik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/206918.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chemicals removal (water treatment)
    alkalinity
    aquifers
    coal mines
    groundwater
    groundwater pollution
    groundwater resources
    impurities
    redox reactions
    water pollution control
    uzdatnianie wody
    zasadowość
    warstwy wodonośne
    kopalnie węgla
    wody gruntowe
    zanieczyszczenie wód gruntowych
    zasoby wód podziemnych
    zanieczyszczenia wody
    żelazo
    reakcje redoks
    zanieczyszczenia nieorganiczne
    Opis:
    The coal mine waste dumps located in the southern provinces of Poland pollute groundwater with metals. As a result of batch experiments presented in the paper, it can be said that it is possible to remove chromium and copper from the groundwater (which is affected by acid mine drainage, thus characterized by low pH) with the use of zero-valent iron in permeable reactive barrier technology. The contaminants are removed from the aquifer by the flow of groundwater through a reactive barrier filled with a special reactive material. Rapid metal removal likely occurred due to the reduction and the precipitation/co-precipitation and/or due to the adsorption onto the iron metal surface or/and onto the iron corrosion products. In accordance with the research it has also been found that in more alkaline environment, the oxidation of Fe(0) proceeds slower. A rapid decrease of the redox potential as well as the increases of pH have also been observed in the batch tests when the dose of Fe(0) in solutions increased.
    Źródło:
    Environment Protection Engineering; 2015, 41, 1; 15-27
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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