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Vol. 31 No. 7 (2019): Vol 31 Issue 7

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Evaluation of Equilibrium Isotherms and Kinetic Parameters for the Adsorption of Methyl Orange Dye onto Blue Green Algal Biomass

https://doi.org/10.14233/ajchem.2019.21932
Surabhi Sagar
Department of Chemistry, K.L.D.A.V. (P.G.) College, Roorkee-247667, India
Arshi Rastogi
Department of Chemistry, K.L.D.A.V. (P.G.) College, Roorkee-247667, India

Corresponding Author(s) : Arshi Rastogi

arshirastogi@gmail.com

Asian Journal of Chemistry, Vol. 31 No. 7 (2019): Vol 31 Issue 7

Abstract

The adsorption of an acidic dye methyl orange onto the dead blue green algal biomass, Oscillatoria species was investigated in a batch mode with respect to contact time, adsorbent dose, pH and temperature. The functional groups and the surface morphology of Oscillatoria species was analyzed by Fourier transform infrared spectroscopy and scanning electron microscopy. Equilibrium isotherms were analyzed by Langmuir, Freundlich, Dubinin-Radushkevich (D-R) and Temkin adsorption models out of which, Langmuir isotherm model was found to be the best fit and exhibited a maximum adsorption capacity of 98.03 mg/g under the optimized conditions. The pseudo-first order, pseudo-second order and intraparticle diffusion models were used to describe the kinetic data and the rate constants at different concentrations were evaluated. Kinetics of adsorption was found to follow the pseudo-second order rate equation. The thermodynamic parameters, such as the changes in enthalpy, entropy and Gibbs free energy showed that the adsorption is endothermic, random and spontaneous at high temperature.The adsorbent could be regenerated using 0.1 mol/L HCl solutions, with upto 75 % recovery. The results indicate that Oscillatoria species could be fruitfully employed as effective biomaterial for the removal of dyes from effluents.

Keywords

Oscillatoria species Methyl orange Adsorption Isotherms Kinetics
Sagar, S., & Rastogi, A. (2019). Evaluation of Equilibrium Isotherms and Kinetic Parameters for the Adsorption of Methyl Orange Dye onto Blue Green Algal Biomass. Asian Journal of Chemistry, 31(7), 1501–1508. https://doi.org/10.14233/ajchem.2019.21932
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