Adsorption of N-methylated diaminotriphenilmethane dye (malachite green) on natural rarasaponin modified kaolin

摘要

The modification of kaolin using natural surfactant rarasaponin was studied. The effective-\udness of kaolin and rarasaponin-kaolin was evaluated for removal of malachite green (MG)\udfrom the aqueous solution. The temperature dependent forms of Langmuir, Freundlich, Sips\udand Toth model were employed to correlate the adsorption experimental data. Even all iso-\udtherms used in this study, visually can correlate the experimental data well, however Sips\udmodel gave consistent and reasonable values of the fitted parameters. Kinetic data were ana-\udlyzed using pseudo-first- and pseudo-second-order, and pseudo-first-order gave reasonable\udvalues of fitted parameters. Thermodynamic properties of adsorption of MG onto kaolin and\udrarasaponin-kaolin were also obtained in this study.