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    Wyświetlanie 1-3 z 3
    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:
    Infrared studies and spectral properties of photochromic high silica glasses
    Autorzy:
    Girsova, M A
    Golovina, G F
    Drozdova, I.A.
    Polyakova, I G
    Antropova, T V
    Powiązania:
    https://bibliotekanauki.pl/articles/174765.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    silica porous glass
    photochromic high silica glass
    transmission electron microscopy TEM
    X-ray diffraction (XRD)
    UV–VIS–IR transmission spectra
    Opis:
    The structure of photochromic high silica glasses (PHSGs) was studied by UV–VIS–NIR and IR spectroscopy, transmission electron microscopy (TEM) and X-ray diffraction (XRD) techniques. PHSG plates were obtained by impregnation of silica porous glasses at first with AgNO3 aqueous solution (in or without the presence of the sensitizers, such as Cu(NO3)2 or Ce(NO3)3), next in the mixed halide salt (NH4Cl, KBr, KI) solution. Then a part of the samples was sintered at temperatures from 850 to 900 °C up to closing of the pores. The results of TEM study have shown that the PHSG plates have two-phase structure with inclusions of the size of 10–100 nm. According to XRD data, the PHSGs contain the AgBr phase. IR spectra confirmed the presence of AgI, AgCl, CeO2, CuCl2, CuCl phases in PHSGs.
    Źródło:
    Optica Applicata; 2014, 44, 2; 337-344
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Catalytic decomposition of toluene over La1-xSr xMnO3/palygorskite synthesized catalysts
    Autorzy:
    Song, L.
    Chen, T.
    Chen, D.
    Chen, Y.
    Xie, J.
    Liu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/207996.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    catalysts
    manganese
    manganese oxide
    toluene
    transmission electron microscopy
    X ray diffraction
    Palygorskite
    katalizatory
    mangan
    tlenek manganu
    toluen
    transmisyjna mikroskopia elektronowa
    dyfrakcja promieniowania rentgenowskiego
    Opis:
    Palygorskite (PG) supported La1-xSrxMnO3 catalysts were fabricated by copreripitation. The catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), specific surface area (SSA) and H2 temperature programmed reduction (H 2-TPR). Catalytic activity for VOCs was examined by using toluene as a model compound. The results show that the surface area as well as mechanical strength of catalysts increase substantially after catalysts loaded in PG. XRD patterns show that after calcination at 700 0C, PG as a support in 9% LaMn03/PG and 9% La0.7Sr0.3MnO3/PG was transformed into amorphous phase and the morphology was not destroyed. It was well established that the main reductive components are factually Mn(III) or Mn(IV) oxides in catalysts based on the results of TPR. It was also found that Mn(IV) increases while Mn(III) reduces responding with the increasing amount of Sr. Toluene conversion rate of as-preparedμ% La1-xSr xMnO3/PG increases with the increasing values of x and μ when x=0-0.3 and μ = 3-9%. Toluene can be converted completely at 285 0C by 9% La0.7Sr0.3MnO3/PG catalyst while no significant change was observed after addition on the doping and loading amount of Sr. During a 100 h stability experiment of 9% La 0.7Sr0.3MnO3/PG catalyst, toluene removal was found to be above 95%.
    Źródło:
    Environment Protection Engineering; 2013, 39, 3; 31-42
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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