Adsorption Kinetics of Malachite Green Dye Removal from Aqueous Solution by using Banana Stem

This research work goals at searching theeffectiveness of Malachite Green dye removal using banana stem,an agricultural waste as an activated carbon. The banana stemactivated carbon was made ready in the laboratory bycarbonization followed by activation. Adsorption studies werecarried out to check the effect of various experimental conditionslike different pH values, varying contact time, initialconcentration of dye and changing banana stem carbon dosageon the removal of Malachite Green dye from aqueous solution atconstant Temperature and agitation speed. The equilibriumexperimental data were used for applicability of Langmuir andFreundlich isotherm models and the kinetic models. Batch testshowed that maximum of 99% of dye was removed when the dyeconcentration was 2 mg/L, at an adsorbent dose of 0.75 gm/L atdye pH 8 in 45 minutes. From the obtained results it is validatedthat the equilibrium data’s favorable for both Freundlich andLangmuir isotherms. Maximum adsorption capacity of bananastem carbon on malachite green dye was found to be 8.29 mg/g. Itwas prevailing that the adsorption process followed thepseudo-second-order rate kinetics. It was observed that intraparticle diffusion is not the only rate-limiting step in thisadsorption system but also regression results indicate that thelinear regression model gives the best results. The aboveobservations recommend that Banana stem carbon can becompetently implemented for removal of malachite green dye fromaqueous solution in the adsorption treatment processes.