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    Wyświetlanie 1-4 z 4
    Tytuł:
    Development of Chemosorbent Based on Metallic Waste for Cleaning Mine Water from Molybdenum
    Autorzy:
    Isakov, A. E.
    Matveeva, V. A.
    Chukaeva, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/125049.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    molybdenum
    leaching
    mine waters
    hydrochemical anomaly
    metal waste
    chemical adsorbent
    Opis:
    The article presents the results of hydrochemical studies of water objects, located in the impact zone of one of the largest mining enterprises in the Russian Federation – JSC “Apatite”. According to the monitoring studies, the source of surface water pollution with molybdenum was determined, geochemical assessment of the molybdenum transformation in the system “ore-bearing rocks – mine water – surface water” was performed. In order to reduce the technogenic load on the surface water located in the considered area, the way of large-tonnage mine waters purification from molybdenum was proposed. The method involves using the chemical sorbent based on waste metals. The method of sewage purification will allow solving one of the key environmental problems of the considered enterprise and, in addition, to improve the environmental situation in the considered area as well as the quality of the local population life.
    Źródło:
    Journal of Ecological Engineering; 2018, 19, 1; 42-47
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bio-polishing sludge adsorbents for dye removal
    Autorzy:
    Zaini, M. A. A.
    Norulaina, A.
    Mohd Azizi, C. Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/779794.pdf
    Data publikacji:
    2016
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    adsorption
    adsorbent
    bio-polishing sludge
    methylene blue
    chemical treatment
    Opis:
    The objective of this work is to evaluate the removal of methylene blue dye by bio-polishing sludge-based adsorbents. The adsorbents were characterized according to the specific surface area, pH upon the treatment and surface functional groups. The adsorption of dye was carried out at room temperature, and the adsorption data were analyzed using the isotherm and kinetics models. The bio-polishing sludge is rich in ash content, and the presence of surface functional groups varied with the treatment strategies. The specific surface area of adsorbents is between 7.25 and 20.8 m2 /g. Results show that the maximum removal of methylene blue by sludge adsorbents was observed to have the following order: untreated sludge (SR) > zinc chloride-treated (SZ) > microwave-dried (SW) = potassium carbonate-treated (SK) > acid-washed (SH). The maximum adsorption capacities for SR and SZ as predicted by the Langmuir model are 170 and 135 mg/g, respectively. Although SR demonstrates a higher maximum removal than SZ, the latter exhibits greater removal intensity and rate constant even at high dye concentration. The bio-polishing sludge is a promising adsorbent for dye wastewater treatment.
    Źródło:
    Polish Journal of Chemical Technology; 2016, 18, 4; 15-21
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Isotherm studies of malachite green removal by yarn processing sludge-based activated carbon
    Badanie izoterm usuwania zieleni malachitowej przez osad ściekowy modyfikowany węglem aktywnym
    Autorzy:
    Tang, Shu Hui
    Zaini, Muhammad Abbas Ahmad
    Powiązania:
    https://bibliotekanauki.pl/articles/106340.pdf
    Data publikacji:
    2019
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    adsorbent
    adsorption
    chemical activation
    dye removal
    sludge
    adsorpcja
    aktywacja chemiczna
    usuwanie barwników
    szlam
    Opis:
    Adsorption is an effective wastewater treatment technique which has been widely used in various industrial applications. However, the high operation cost involving commercial activated carbon in industrial processes is the main drawback. Sewage sludge is an auspicious precursor of activated carbon owing to its high carbon content, rich functional groups, low cost, high availability and abundance. This research was aimed to establish the feasibility of converting yarn processing sludge into activated carbon by KI + KOH activation and char at 700 °C for 1 h. The effect of preparation strategies on the properties of sludge-based adsorbents (SBA) was reviewed. The applications of SBAs in the removal of dyes and model pollutants were discussed. The results from this study proved that the preparation of yarn processing sludge-based activated carbon via KI + KOH activation is feasible and effective in the adsorption of dye. This paper provides further insight on the preparation methods of sludge-based adsorbents and dye wastewater treatment using these adsorbents.
    Źródło:
    Chemistry-Didactics-Ecology-Metrology; 2019, 24, 1-2; 127-134
    2084-4506
    Pojawia się w:
    Chemistry-Didactics-Ecology-Metrology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption kinetics of fluoride on bone char and its regeneration
    Autorzy:
    Hu, J.
    Wu, D.
    Rao, R.
    Liu, R.
    Lai, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/206892.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chlorine compounds
    fluorine compounds
    ions
    sodium compounds
    sulfur compounds
    adsorption kinetics
    chemical reaction equilibrium
    correlation coefficient
    Freundlich equation
    optimal conditions
    layered double hydroxides
    aqueous-solution
    drinking water
    equilibrium
    adsorbent
    związki chloru
    związki fluoru
    jod
    związki sodu
    związki siarki
    kinetyka adsorpcji
    równowaga reakcji chemicznej
    współczynnik korelacji
    równanie Freundlicha
    woda pitna
    równanie Langmuira
    Opis:
    The adsorbent of bone char (BC), produced from the pyrolysis of crushed animal bones, was dominated by the mesopores of the Brunauer Emmett Teller (BET) surface area. The optimal condition for defluoridation with BC was a pH level near 5.0. Chloride and nitrate ions could increase fluoride adsorption capacity in contrast with the effect of sulfate and carbonate ions. The interchangeability between fluoride and hydroxyl groups on BC sorbent was proved by the Fourier transform infrared spectroscopy. Langmuir equation had a better correlation coefficient than the Freundlich equation at various temperatures. Thermodynamic parameters such as Delta G degrees, Delta H degrees, Delta S degrees, Ea and S*, have been calculated to describe the nature of fluoride adsorption onto BC. Negative Delta G degrees and Delta H degrees values at various temperatures indicate a spontaneous process, and its exothermic effect, respectively. However, a positive Delta S degrees value represents an increasing process for entropy. The E-a and S* values ranging from 5 to 40 kj.mol-1 and 0 to 1, respectively, demonstrated that the adsorption is dominated by physical process, although the adsorption kinetic process was involved external diffusion, intraparticle diffusion and chemical reaction equilibrium stage. A high concentration of NaOH solution increases efficiency of removing adsorbed F- ions from the BC surface.
    Źródło:
    Environment Protection Engineering; 2017, 43, 3; 93-112
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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