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Efficient biosorption of chromium(VI) ion by dry Araucaria leaves

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In this paper, batch removal of hexavalent chromium from aqueous solutions by Araucaria heterophylla leaves was investigated. The batch experiments were conducted to study the adsorption of metal species and effect of different pH, contact time, metal concentration, biosorbent concentration, and adsorption capacity.


Freundlich and Langmuir’s isotherm model were used to describe the adsorption behavior, and the experimental results fitted Freundlich model well.


The adsorption efficiency observed for all chromium concentrations, i.e., 1, 3, 5, and 10 mg/L was 100% and the equilibrium was achieved in 30 min for 1 and 3 mg/L, whereas for 5 and 10 mg/L, it was less than 60 min. FTIR spectra was taken to identify functional groups involved in the biosorption.


Thus, Araucaria leaves can be considered as one of the cheap and efficient biosorbent for toxic hexavalent chromium removal from natural or wastewaters.

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One of the authors, Dhara Shukla, would like to thank the Council of Scientific and Industrial Research, Government of India, for the financial assistance.

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Correspondence to Padma S. Vankar.

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Responsible editor: Vinod Kumar Gupta

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Shukla, D., Vankar, P.S. Efficient biosorption of chromium(VI) ion by dry Araucaria leaves. Environ Sci Pollut Res 19, 2321–2328 (2012).

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  • Hexavalent chromium
  • Biosorption
  • Freundlich isotherm
  • Araucaria heterophylla
  • FTIR