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Adsorption of Rhodamine B from an Aqueous Solution: Kinetic, Equilibrium and Thermodynamic Studies

M.Santhi, P.E.Kumar

Activated carbon was developed from TyphaAngustata L, characterized and used for the removal of Rhodamine B from waste water successfully. Rhodamine B is one of the water soluble, basic red cationic Xanthene class dyes, a common water tracer fluorescent. Batch adsorption experiments were carried out as a function of PH,contact time, initial concentration of the adsorbate, adsorbent dosage and temperature. The experimental data were analyzed using the pseudo second order kinetic model. The equilibrium data satisfied by Langmuir Isotherm models. The changes in standard free energy (ΔGº), Standard Entropy(ΔSº) Standard enthalphy (ΔHº) were calculated. The thermodynamic study has showed that the dye adsorption phenomenon onto AC-MnO2-NC was favorable, endothermic and spontaneous.