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    Wyświetlanie 1-2 z 2
    Tytuł:
    Removal of lead ions from acid aqueous solutions and acid mine drainage using zeolite bearing tuff
    Autorzy:
    Zendelska, A.
    Golomeova, M.
    Golomeov, B.
    Krstev, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/204844.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    adsorption
    acid mine drainage
    zeolite bearing tuff
    lead ions
    equilibrium studies
    Sasa mine
    Opis:
    The adsorption of lead ions onto a zeolite bearing tuff (stilbite) from synthetic acid aqueous solution and acid mine drainage taken from Sasa mine, Macedonia, is elaborated in this paper. The results present that adsorption occurs efficiently in both of cases. The physical and chemical properties of the used natural material, zeolite bearing tuff, are characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy. The concentration of metal ions in solution before and after treatment is obtained by AES-ICP. The effectivity of zeolite bearing tuff is determined through a series of experiments under batch conditions from single ion solutions, whereby the main parameters are the effects of initial pH of solution, mass of adsorbent, initial metal concentration in solution, contacting time and competing cations. The maximum capacity of zeolite bearing tuff for removal of lead ions from solution is determined by equilibrium studies. The experimental obtained data are fitted with Freundlich and Langmuir adsorption models. The experimental data are better fitted with Langmuir adsorption isotherm. Zeolite bearing tuff is effective adsorbent for treating acid mine drainage. The results showed that 99% of lead ions are removed from acid mine drainage, i.e. the concentration of lead ions from 0.329 mg/dm3 decrease to 0.002 mg/dm3. The pH value of acid mine drainage from 3.90 after treatment with zeolite bearing tuff increases to 5.36.
    Źródło:
    Archives of Environmental Protection; 2018, 44, 1; 87-96
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling and analysis of batch extraction process for efficient removal of cadmium and pathogens from aqueous solution using modified plantain peel biochar
    Autorzy:
    Nworie, F. S.
    Oti, W. O.
    Nwali, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193435.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Aspergillus
    Biochar
    Candida
    Escherichia coli
    Pseudomonas aeuroginosa
    Staphylococcus aureus
    cadmium (II)
    equilibrium studies
    mass transfer
    pathogens
    Opis:
    Consumption of water contaminated with pathogens and heavy metals is responsible for the demise of millions of people around the globe. To find a low cost, facile and benign route for developing a biosorbent capable of handling the challenges associated with unsafe drinking water, the study report the preparation, activation, adsorption and removal of cadmium and pathogenic organisms from water samples. Modified plantain peel biochar (MPPB) was characterized using Braunauer-Emmett-Teller (BET) surface area and X-Ray diffraction (XRD). Surface area and pore size of the MPPB determined from BET surface area plot are 8.79 cc/g and 16.69 m2/g respectively with XRD crystallite size of 14.56 nm. The maximum adsorption capacity was observed to be 366.300 mmolkg-1. Equilibrium isotherm indicated the coefficient of determination to increase from Jovanovich →Elovic→Temkin→Freundlich→Langmuir model. Surface interaction and mass transfer kinetics shows a mixture of intra-particle diffusion and mass transfer process. The adsorption kinetics and surface interaction models coefficient of determination increased from Bangham pore diffusion →mass transfer model→Liquid film diffusion→pseudo first order→Dunwald-Wagner→Elovic→Pseudo-second order→Weber and Moris model. The adsorption indicated a chemisorption process with rate limitimg step likely to involve electron pair donor-acceptor interactions, hydrogen bonding and dipole dipole interactions. Antimicrobial evaluation of MPPB showed that it is a potential antimicrobial agent against common micro-organisms.
    Źródło:
    World Scientific News; 2021, 157; 1-24
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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