Vol. 11, Issue 2 (2023)
The Equilibrium, Kinetic and Thermodynamic studies on the Adsorptive Removal of Alizarin dye utilizing dead blue-green algal biomass
Author(s): Dr. Surabhi Sagar and Dr. Arshi Rastogi
Abstract: The removal of the anthraquinone dye Alizarin from synthetic aqueous solutions, by adsorption onto dead blue-green algal biomass, Oscillatoria sp., is detailed in this communication, as well as the kinetics, adsorption isotherms, and thermodynamics of the process. Using the optimized parameters from batch adsorption investigations, many adsorption equilibrium isotherms (Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherm) and kinetic models (pseudo-first-order, pseudo-second-order, and intraparticle) were applied. Under the optimized conditions of 1 pH, 0.4 g/L adsorbent dose, 318 K temperature, and 120 minutes of contact time, the Langmuir isotherm analysis revealed the maximum monolayer adsorption capacity to be 80.64 mg/g. In a statistical comparison of regression results, it was determined that the Pseudo-second-order kinetic model and the Langmuir adsorption isotherm provided the best fits (R2). The variations in the thermodynamic parameters indicate that adsorption is an endothermic, random, and spontaneous process in this study. With eluent containing 0.1 M HCl, up to 70% of the algal biomass used as the adsorbent material could be recovered, and the same biomass could be reused five times without appreciably decreasing its adsorption ability. Moreover, compared to other adsorbents, the Oscillatoria sp. algae utilized in our work showed a high capacity for Alizarin dye adsorption. This study implies that the biomass of Oscillatoria sp. could be a beneficial biomaterial for treating synthetic aqueous solutions containing alizarin dye.
Pages: 25-32 | 562 Views 110 Downloads
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How to cite this article:
Dr. Surabhi Sagar, Dr. Arshi Rastogi. The Equilibrium, Kinetic and Thermodynamic studies on the Adsorptive Removal of Alizarin dye utilizing dead blue-green algal biomass. Int J Chem Stud 2023;11(2):25-32.
