Indian Journal of Advances in Chemical Science Volume: 6, Issue 4: , December 2018

ISSN No.: 2320-0898 (Print); 2320-0928 (Electronic)

DOI: 10.22607/IJACS.2018.604005

Research Article

Removal of methylene blue from wastewater using Fe₂O₃ as an adsorbent

Ajoy Kanti Mondal*, Taposhi Rabeya, Mohammad Asadullah Asad

ABSTRACT

The removal of methylene blue (MB) from wastewater was studied using ferric oxide (Fe₂O₃) as an adsorbent. The adsorption potential of Fe₂O₃ was investigated in batch adsorption experiment. The adsorption experiments were carried out with variation in contact time, initial pH, and temperature of the solution. The equilibrium time for the adsorption of MB on Fe₂O₃ was found to be about 3 h. Adsorption isotherms were measured at three different temperatures and found to fit Langmuir isotherm. The positive values of estimated enthalpy of adsorption were indicative of activated adsorption. Batch adsorption models, based on the assumptions of the Lagergren pseudo-first-order and the pseudo-second-order model, were applied to predict the kinetics of the adsorption and data fitted very well to the pseudo-second-order kinetic model.

Key words: Adsorption, Adsorbent, Equilibrium, Langmuir isotherm, Methylene blue, Ferric oxide

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