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Research Publications (Engineering and Built Environment)

Permanent URI for this collectionhttp://ir-dev.dut.ac.za/handle/10321/215

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    Acetic acid adsorption onto activated carbon derived from pods of Acacia nilotica var astringens (Sunt tree) by chemical activation with ZnCl2
    (IISTE, 2015) Elhussien, Mutasim H.; Isa, Yusuf Makarfi
    The purpose of this study is to prepare and investigate the adsorption behavior of acetic acid onto two samples of activated carbon prepared from Acacia nilotica var astringens, Sunt tree,( SUNT-C1 and SUNT-C2). Applicability Langmuir, Freundlich, Temkin and Dubinin-Radushkevitch models of adsorptions isotherm have been tested, while acetic acid initial concentration varied between (0.010 – 0.300) mol/dm3. A comparative study of adsorption capacities of these samples was performed. The obtained data were compared and fitted well with the four models; there exist a correlation between physico- chemical properties of the activated carbons and the sorption processes. The maximum monolayer coverage (Qo) from Langmuir isotherm model was determined to be 1.016mg/g. Also from Freundlich Isotherm model, the sorption intensity (n) which indicates favourable sorption and the correlation value are 1.11 and 1.09 respectively.
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    Modified coconut fiber used as adsorbent for the removal of 2-chlorophenol and 2, 4, 6-trichlorophenol from aqueous solution
    (South African Institution of Chemical Engineers, 2014) Ojha, Priyanka; Rathilal, Sudesh; Singh, Kunwar
    The aim of this work was to determine the potential application of adsorbent prepared from coconut fiber for the removal of organic water pollutants. Removal of 2-chlorophenol (2-CP) and 2, 4, 6-trichlorophenol (TCP) from aqueous solution by coconut fiber activated carbon (FAC) and acid treated coconut fiber activated carbon (ATFAC) was investigated. Equilibrium and kinetic studies were performed and the data was fitted to isotherm and kinetic models. Langmuir isotherm model fitted better than Freundlich to the adsorption data. The monolayer adsorption capacity of ATFAC (38.29 mg g-1 for 2-CP and 101 mg g-1 for TCP) at 250C was relatively higher as compared to that of FAC (37.11 mg g-1 for 2-CP and 49.80 mg g-1 for TCP). The adsorption trend was as follows: ATFAC (TCP) > ATFAC (2-CP) > FAC (TCP) > FAC (2-CP). The pseudo-second-order rate model fitted better to the adsorption kinetics as compared to the pseudo-first-order rate model in all the cases. Overall adsorption rate is controlled by film diffusion. The thermodynamic parameters (free energy, enthalpy, entropy changes) exhibited the feasibility and spontaneous nature of the adsorption process. The results of the study show that the carbon prepared from acid treated coconut fiber is more effective than thermally treated fiber in the removal of chloro phenols and can be used as a potential adsorbent for the removal of water pollutants.