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    Wyświetlanie 1-3 z 3
    Tytuł:
    Recovery of copper and nickel from polymetallic sulphate leach solution of printed circuit boards using Dowex M 4195
    Autorzy:
    Ajiboye, Ayorinde E.
    Olashinde, Folorunsho E.
    Adebayo, Ojo A.
    Ajayi, Olubode. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/110680.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    recovery
    copper
    nickel
    Dowex M4195
    kinetics
    isotherms
    reuse
    Opis:
    Sulphuric acid leach solution of waste printed circuit boards (PCBs) contains predominantly copper and iron with later remain problematic during electrowinning of the formal. In this study, performance of Dowex M 4195 resin for recovery of copper and nickel from polymetallic sulphate leach solution of waste PCBs was investigated by batch experiments. It was observed that at pH 0.5, about 45.2 and 3.6 % Cu2+ and Ni2+ was selectively recovered respectively. Recovery efficiency of Ni2+ increased with increase in pH from 0.5 -5.0 while pH2 was optimum for the recovery of Cu2+. Sharp increase in co-recovery of Fe3+/Fe2+ was observed at pH above 2 with that of Zn2+ and Co2+ became low due to hindrance from binding site by high concentration of Cu2+. Adsorption data obtained for Cu2+ and Ni2+ were tested with adsorption isotherms as well as kinetics. It is shown that adsorption of Cu2+2+ was well fitted to both Langmuir and Freundlich isotherm. Kinetics of Cu2+ and Ni2+ fitted into Pseudo-first and well fitted to second order. Reuse studies shows that the resin strong affinities for Cu2+ and Ni2+ remain unchanged.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 5; 1156-1164
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancing adsorption capacity of clay and application in dye removal from waste water
    Autorzy:
    Ogunmodede, O. T.
    Adebayo, O. L
    Ojo, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/412039.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    snail shell
    methylene blue
    natural clay
    langmuir
    freundlich
    temkin
    Halsey and Harkins-Jura isotherm equations
    Opis:
    Natural clay has been considered as a potential absorbent for removing pollutants from water and waste water. Nonetheless, the effective application of clay for water treatment is limited due to small surface area and presence of net negative surface charge, leading to it low adsorption capacity. The absorption capacity was boosted via intercalation of CaO derived from snail shell (SS). The methylene blue sorption potential, PZC, and the surface area of unmodified clay sample were substantially enhanced by the intercalation process. The process of sorption of MB from solution was analyzed using five different isotherm models (Langmuir, Freundlich, Temkin, Harkins-Jura, and Halsey isotherm equations). The value of the Langmuir monolayer sorption capacity qm (mg/g) increased from 50.12 to 88.71, PZC values increased from 4.50 to 7.40, and the surface area (m2/g) value increased from 27 m2/g to 123 m2/g after the intercalation process. The experimental data were fitted into two kinetic models: Lagergren pseudo-first order and the chemisorptions pseudo-second order. It was observed that chemisorptions pseudo-second order kinetic model described the sorption process with high coefficients of determination (r2) better than pseudo first other kinetic models. The modification caused no change in the clay surficial microstructure but increased the lattice spacing of the clay framework.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 20, 1; 35-51
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of microbial and heavy metal concentration per distance and depth at a municipal solid waste Landfill
    Autorzy:
    Ogunmodede, O.T.
    Ojo, A.A.
    Adebayo, O.L.
    Powiązania:
    https://bibliotekanauki.pl/articles/11267.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    The field study involved 4 sites and 15 samples according to the wind directions: North, East, South and West. The analysis was conducted through the use of Atomic Absorption spectroscopy (AAS). Ten types of heavy metals were identified as indicators for pollution namely Mg, Ca, Mn, Fe, Cu, Zn, Pb, Ni, Cr, and Cd. The results indicated that the concentration of Fe was the most dominant per specific distances and depths and exceeded the minimum standard in North, East and West directions. While Cu was the second most dominant with concentration exceeding minimum standard per specific distance and depth, mainly in the West direction. The results have shown presence of bacterial species including Pseudomonas, Mirococcus, Actinomyces, Neisseria, Bacillus and Klebsiella. These pathogens can infect wounds and cause sepsis and mortality and can even occur with such organisms to cause secondary infection. These groups of organisms are almost impossible to control since they are ubitiquous.
    Źródło:
    International Letters of Natural Sciences; 2014, 22
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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