Comptes rendus de l’Acade'mie bulgare des Sciences, Vol 70, No4, pp.497-504
Biosorption of Cd2+ Ions Using Mentha spicata L. and Ruta graveolens L.
Paunka S.Vassileva, Albena K.Detcheva, Lidia P.Ivanova, Snezhanka K.Evtimova
The feasibility of using Mentha spicata L. (MS) and Ruta graveolens L. (RG) for the removal of Cd2+ ions from aqueous solution was investigated. Batch experiments were performed to evaluate the effect of contact time, acidity and initial metal concentration on Cd2+ removal from aqueous solutions. Equilibrium experimental data were fitted to linear Langmuir and Freundlich models. It was established that Freundlich isotherm most adequately described the adsorption process. Pseudo-first order, pseudo-second order and intraparticle diffusion models were used to analyze kinetic data. Maximum biosorption capacities for MS and RG were found to be 19.23 mg/g and 16.95 mg/g, respectively. The study revealed that both plants MS and RG could be used as effective biosorbents for the removal of Cd2+ ions from aqueous media.
Key words: Mentha spicata L., Ruta graveolens L., biosorption of cadmium ions, adsorption isotherms