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    Removal of lead ions from wastewater using multi walled carbon nanotubes modified with sodium lauryl sulfate

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    Date
    2017-12
    Author
    Suliman, Malaz
    Ibrahim, Taleb
    Jumean, Fawwaz
    Khamis, Mustafa
    Sabri, Muhammad Ashraf
    Advisor(s)
    Unknown advisor
    Type
    Article
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    Abstract
    Multi walled carbon nanotubes (MWCNTs) modified with sodium lauryl sulfate (SLS) were synthe-sized, characterized and successfully used for the removal of Pb2+ from aqueous solutions. Adsorp-tion results revealed that this surface modification increased adsorption capacity from 3.84 to 141 mg/g. Adsorption on raw-MWCNTs followed the Langmuir isotherm with qm = 3.84 mg/g and KL = 0.29 L/mg, whereas adsorption on SLS-MWCNTs followed the Freundlich isotherm with n = 2.50 and KF = 15.40 mg 0.6·L0.4/g. Adsorption kinetics on raw and modified MWCNTs followed a pseudo second order law with rate constants 0.11 and 0.06 g/mg·min, respectively. Thermodynamic studies showed that Pb2+ was physisorbed on both adsorbents, with apparent Gibbs free energy, ∆G °,values of –0.45 and –9.21 kJ/mol at 25°C, respectively. Magnetite derivatives of SLS-MWCNTs were synthesized and used for Pb2+ removal. Batch adsorption studies on the magnetite and non-magnetite SLS-MWCNTs gave similar results. The enhanced density of the magnetite pellets of SLS-MWCNTs allowed for their use in a packed bed column. Column operation modeling results showed that the modified dose response model most adequately describes the column data with parameter values qmdr = 28.4 mg/g and a’ = 3.47 mg–1.
    DSpace URI
    http://hdl.handle.net/11073/16258
    External URI
    https://doi.org/10.5004/dwt.2017.21829
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