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  • Chem Sci Trans., 2017, 6(4),  pp 630-636  

    DOI:10.7598/cst2017.1230

    Research Article

    Removal of Methylene Blue from Aqueous Solutions Using Fly Ash Modified with Sodium Hydroxide

  • EBELEGI NEWTON AUGUSTUS, AYAWEI NIMIBOFA* and WANKASI DONBEBE
  • Department of Chemical Sciences, Niger Delta University, Wilberforce Island, Bayelsa State, Nigeria
  • Abstract

    Fly ash was modified by chemical treatment with NaOH solutions of varying concentrations (4, 3, 2 and 1 M) and labeled SHFA-4, SHFA-3, SHFA-2, SHFA-1 respectively. All four forms of fly ash were tested as adsorbents for the removal of methylene Blue dye from aqueous solutions. The effect of contact time and concentration were investigated using a batch adsorption technique. The experimental data could best be described by the Freundlich isotherm and the dynamic data fit well with the pseudo-second-order kinetic model, which suggests that the adsorptions appeared to be multilayer adsorption processes. Fly ash modified with 4 M NaOH (SHFA-4) demonstrated the highest adsorption capacity (KF=77.04 mg/L). The kinetic data confirms the applicability of the pseudo-second-order kinetic model which indicates multilayer adsorption processes. These results suggests that fly modified with NaOH could be employed as a low cost adsorbent for the removal of methylene blue form wastewater streams from textile, tanning and printing industries

    Keywords

    Adsorption, Methylene Blue, Freundlich Isotherm, Fly ash

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