Evans blue removal from wastewater by rarasaponin–bentonite


The feasibility of natural bentonite and rarasaponin–bentonite for Evans blue removal from aqueous solution was studied. Rarasaponin is a natural surfactant obtained from Sapindus rarak DC was used as modifying agent for natural bentonite modification. Adsorption experiments were conducted in a batch system at various temperatures. Several temperature-dependent isotherm models (Langmuir, Freundlich, Sips and Toth) were used to represent equilibrium data. It was found that Toth model represents the adsorption equilibrium data better than other models. Kinetic data were best represented by the pseudo-first order model. The controlling mechanism of the adsorption of Evans blue onto natural bentonite and rarasaponin–bentonite was physical adsorption.

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The first author would like to express their sincere gratitude to the Department of Chemical Engineering National Taiwan University of Science and Technology, Taiwan, for undergraduate exchange student grant and providing all the research facilities.

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Correspondence to S. Ismadji.

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Chandra, I.K., Ju, YH., Ayucitra, A. et al. Evans blue removal from wastewater by rarasaponin–bentonite. Int. J. Environ. Sci. Technol. 10, 359–370 (2013). https://doi.org/10.1007/s13762-012-0114-y

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  • Bentonite
  • Modification
  • Adsorption
  • Rarasaponin