Equilibrium sorption isotherm for metal ions on tree fern

Y. S. Ho, C. T. Huang, H. W. Huang

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510 Citations (Scopus)


A new sorbent system for removing heavy metal ions, such as Zn(II), Cu(II) and Pb(II), from aqueous solutions has been investigated. This new sorbent is tree fern, an agriculture product. Variables of the system include solution temperature and sorbent particle size. The experimental results were fitted to the Langmuir, Freundlich and Redlich-Peterson isotherms to obtain the characteristic parameters of each model. Both the Langmuir and Redlich-Peterson isotherms were found to well represent the measured sorption data. According to the evaluation using the Langmuir equation, the maximum sorption capacities of metal ions onto tree fern were 7.58 mg/g for Zn(II), 10.6 mg/g for Cu(II) and 39.8 mg/g for Pb(II). It was noted that an increase in temperature resulted in a higher metal loading per unit weight of the sorbent. Decreasing the particle sizes of tree fern led in an increase in the metal uptake per unit weight of the sorbent.

Original languageEnglish
Pages (from-to)1421-1430
Number of pages10
JournalProcess Biochemistry
Issue number12
Publication statusPublished - Jul 2002


  • Agriculture product
  • Copper
  • Lead
  • Sorption
  • Tree fern
  • Zinc

ASJC Scopus subject areas

  • Biochemistry


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