Adsorption Behavior of MB Dye on Activated Usoro (Adenia Lobata) Fiber; Equilibrium, Kinetics and Thermodynamic Studies

This paper presents the feasibility of removal of MB dye from aqueous solution using activated carbon prepared from Usoro fiber (Adenia lobata). FTIR analysis revealed that many functional groups were present on the surface of the adsorbent. The adsorption Kinetics was analyzed by pseudo first order, pseudo second order and intra particle diffusion kinetics models. Results showed that MB adsorption followed the pseudo first order and intraparticle diffusion models appropriately. Isotherm data were treated according to Langmuir and Freundlich models. The result showed that both models fitted the data reasonably but Langmuir isotherm model fitted better in the temperature ranges studied. The thermodynamic parameters, such as Gibb’s free energy change, standard enthalpy change, and standard entropy change were evaluated. The negative values of Gibb’s free energy confirmed the feasibility and spontaneity of the adsorption process. The study confirmed the process to be endothermic at lower initial concentrations and exothermic at higher initial concentrations studied. Index Terms Adsorption, Isotherm, Kinetics, Thermodynamics, Usoro fiber.