Kinetic and Equilibrium Modeling of Anionic Dye Adsorption on Polyaniline Emeraldine Salt: Batch and Fixed Bed Column Studies

다국어 초록 (Multilingual Abstract)

In this work, removal of anionic dye Eosin Yellow (EY) by polyaniline emeraldine salt (PANI-ES) from theaqueous medium was studied by using both batch and fixed-bed column mode. Before and after the dye adsorption, theadsorbents were characterized by UV-Vis, FTIR, and XRD analysis. The morphology of the adsorbent was also studied byscanning electron microscopy (SEM). The batch adsorption study was performed by varying the initial concentration of thedye and pH. The experimental results obtained were fitted to the three isotherm models namely Langmuir, Freundlich, andTemkin and the Langmuir isotherm was found to be the best fitting model with the adsorption capacity 335 mg/g. Theadsorption process followed pseudo second order kinetics. The thermodynamic study was also performed andthermodynamic parameters ΔHo, ΔSo, and ΔGo were calculated. The adsorption experiments were also carried out in packedcolumns by varying some important factors like flow rate, bed height, pH, and the initial dye concentration. The experimentalresults obtained were fitted using Bohart-Adams, Yoon-Nelson, and Thomas models. Among the models studied, the highestadsorption capacity, 79.0 mg/g was calculated from Thomas model at pH 4 with 375 mg/l initial concentration, flow rate0.3 ml/min, and bed height 1.4 cm.

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