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    Purification of water using surface engineered zeolites

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    Matseketsa_Purification_of_water_using_surface_engineered_zeolites.pdf (2.010Mb)
    Date
    2018
    Author
    Matseketsa, Priscilla
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    Abstract
    Coal fly ash obtained from Coca Cola Company in Harare was utilised in synthesis of zeolites by hydrothermal method using 3M NaOH. The Ze-ZnO nanoflakes and Ze-ZnO nanorods were successfully synthesised using a combination of hydrothermal and one pot homogeneous precipitation method. The zeolitic materials were characterised by FT-IR, BET SEM, XRD and EDX. The Ze-ZnO nanoflake and Ze-ZnO nanorod samples were tested for heavy metal removal capacity by using 300 ppm of Cd and Pb. The adsorption experiment was done using 0.2 g of the Ze-ZnO nanoflakes and Ze-ZnO nanorods under mechanical shaking for 60 mins. The Ze-ZnO nanoflakes proved to be efficient in the removal of heavy metals with adsorption capacities of 74 mg/g and 15.5 mg/g for Pb and Cd respectively compared to 62.5 mg/g and 11.3 mg/g with Ze-ZnO nanorods. The photocatalytic activities of Ze-ZnO nanorods and Ze-ZnO nanoflakes were tested using methylene blue dye as model pollutant under UV irradiation. The degradation efficiencies of Ze-ZnO nanorods and Ze-ZnO nanoflakes were almost the same, 95.61% and 96.87% respectively. The adsorption of heavy metals and degradation of MB dye on Ze-ZnO nanorods followed pseudo second order kinetics. The photocatalytic activities of Ze-ZnO nanoflakes and Ze-ZnO nanorods fitted in the first order kinetic plot. The adsorption isotherms of Pb, Cd and methylene blue dye fitted perfectly into the Langmuir isotherm. The multifunctional characteristics of Ze-ZnO nanorods were established and these included adsorption and photo degradation therefore it can qualify as an alternative to existing water treatment methodologies.
    URI
    http://hdl.handle.net/10646/3877
    Additional Citation Information
    Matseketsa, P. (2018). Purification of water using surface engineered zeolites. (Unpublished thesis). University of Zimbabwe.
    Subject
    Coal fly ash
    zeolites
    one pot homogeneous precipitation method
    Ze-ZnO nanoflakes
    Ze-ZnO nanorods
    UV irradiation
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