Isotherm and Thermodynamic Analysis on the Adsorption of Rhoda mine B Dye onto Borassus flabellifer bark Nano Carbon
Journal Title: IOSR Journal of Applied Chemistry (IOSR-JAC) - Year 2018, Vol 11, Issue 4
Abstract
Application of activated Borassus flabellifer bark nano carbon (ABNC) for the removal of a Cationic dye, Rhodamine B, from aqueous solutions has been investigated. The experiments were carried out in batch mode. Effect of the parameters such as pH, initial dye concentration and temperature on the removal of the dye was studied. Equilibrium was achieved in 60 min. Maximum adsorption of dye was achieved at pH 6.6. Removal percentage was found to be dependent on the initial concentration of dye solution, and maximum removal was found to be 96% at 25 mg/L of Rhodamine B. The removal increases from 80% to 96%when the initial concentration of dye solution decreases from 125 mg/L to 25 mg/L. The equilibrium adsorption data were analyzed by Langmuir, Freundlich, Temkin and Dubinin–Radushkevich isotherm models. The (Langmuir) adsorption capacity of the adsorbent is found to be 232.16 mg/g at303 K. Kinetic modeling of the process of removal was carried out and the process of removal was found to follow a pseudo second order model. The thermodynamic parameters such as change in free energy (ΔG 0 ), enthalpy (ΔH 0 ) and entropy (ΔS 0 ) were determined and the negative values of ΔG 0 indicated that the process of removal was spontaneous at all values of temperatures. Further, the values of ΔH 0 indicated the endothermic nature of the process of removal.
Authors and Affiliations
M. Thiruchelvi, M. M. Senthamilselvi, B. R. Venkatraman, S. Arivoli, N. Muruganantham
Keywords
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