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Author: search.filters.author.Azhar, Muhammad Farooq

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    Kinetic, equilibrium and thermodynamic studies for adsorption of nickel ions onto husk of oryza sativa
    (2019-11-01)
    Zafar, Shagufta
    ;
    Khan, Muhammad Imran
    ;
    Khraisheh, Majeda
    ;
    Lashari, Mushtaq Hussain
    ;
    Shahida, Shabnam
    This research focus onto batch adsorption of nickel ions (Ni(II)) onto husk of Oryza sativa (HOS) from aqueous solution at room temperature. Several techniques such as Fourier transform infrared, scanning electron microscopy and energy dispersive X-ray were employed to confirm adsorption of Ni(II) onto HOS. The effect of operational parameters such as contact time, amount of adsorbent, initial concentration of metal ions, temperature and pH on the percentage removal of Ni(II) was evaluated. The removal of Ni(II) was 62.32% under optimum amount of adsorbent (0.3 g) at room temperature. Adsorption kinetics study has exhibited that experimental data fitted-well to pseudo-second-order kinetic model. Linear and nonlinear forms of Langmuir, Freundlich and Dubinin-Radushkevivh isotherms were used to analyse experimental data and results showed that adsorption data fitted well to nonlinear and linear form of adsorption isotherms. Adsorption thermodynamic study has indicated that adsorption of Ni(II) onto HOS was an endothermic and spontaneous process.
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    Development and surface modification of anion exchange membrane for enhancement of antifouling potential in electrodialys process
    (2018-01-01)
    Khan, Muhammad Imran
    ;
    Zafar, Shagufta
    ;
    Khraisheh, Majeda
    ;
    Khan, Muhammad Ali
    ;
    Buzdar, Abdul Rehman
    The membrane fouling in the course of electrodialysis (ED) is a serious problem during water treatment which results to its shorter lifetime and higher energy consumption. Here, the antifouling property of previously reported BPPO-based anion exchange membranes (AEM) has been improved by surface coating with polydopamine (PDA). The modified and unmodified membranes were characterized in term of Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) water contact angle and water uptake. The antifouling potential was investigated in term of transition time, i.e. the time elapsed before the fouling took place.