Equilibrium and Kinetic Modelling on the Removal of Reactive Red 120 using Morinda Tinctoria

Abstract

In the present study the effect of  biosorbent dosage (0.02-0.1g/100 m L^-1), the pH(1-7) and the initial  concentration(10-50mgL^-1) on Reactive Red 120 removal from an aqueous medium using  Morinda Tinctoria Batch experiments were carried out for biosorption kinetics and isotherm studies. The results showed that the dye uptake capacity was found to increase with decrease in the biosorbent dosage. The dye uptake capacity was found to be more at pH 2, when compared to with other pH value. The equilibrium sorption isotherms have been analysed by the Freundlich and Langmuir models. The Freundlich isotherms have the highest co-efficient of determination. The kinetic data of the biosorption was analysed using the pseudo-first order and pseudo-second order kinetic models. The data showed that the pseudo-second order equation was more appropriate. The surface morphology of the seeds of the Morinda Tinctoria was exemplified by scanning electron microscope. Fourier transform infrared analysis   confirm the existence of a amine group in the Morinda Tinctoria