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Removal of Dyes by Using Rice Husk as Agricultural Solid Waste Adsorbent |
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PP: 59-71 |
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Author(s) |
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Sara G. Abd-elnaeem,
Azza.I.Hafez,
Rania M.Sabry,
Shakinas.T.E,
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Abstract |
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| Nano Activated Carbon (NAC) prepared from Rice Husk (RH) was used in batch adsorption experiments for removal of methylene blue (MB) and black B (BB) dyes from synthetic solutions. The effect of different operating parameters were investigated covering the pH (1-11), contact time (15-75 minutes) and temperatures (30-60OC) for the two dyes of different concentrations (50-300 mg/l). The high adsorption capacity achieved at pH 3 for MB and at pH 11 for BB and at 30OC. The adsorption equilibrium was attained after 60 minutes. Adsorption isotherms have been determined and the obtained data were analyzed using four isotherms models Langmuir, Freundlich, Temkin and Dubinin–Radushkevich. The two isotherm models Langmuir and Freundlich were favorable for MB dye but Langmuir was only favorable for BB. Two kinetic models have been studied namely: pseudo first order and pseudo second order kinetics. The results showed that the uptake rate of the NAC adsorbate obeyed pseudo second order kinetic model for both dyes. |
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