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Evaluation of fly ash as an adsorbent for the removal of methylene blue from its aqueous solution

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Experiments were carried out in batch process for the removal of methylene blue a basic dye from its aqueous solutions using fly ash as an adsorbent. The operating variables studied were initial methylene blue concentration, agitation time, fly ash dose and pH. The sorption data follow Langmuir isotherm equation and the adsorption capacity was found to be 1.4298 mg/g. The sorption rate was found to follow Lagergren pseudo first order rate kinetics and the average rate constant was found to be 1.4298 mg/g. Maximum adsorption was observed at neutral pH. Maximum desorption of 50% was achieved in water medium at a pH of 3.

Document Type: Research Article


Publication date: January 1, 2004

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