Removal of metal ions from sodium arsenate solution using tree fern

Y. S. Ho

Research output: Contribution to journalArticle

18 Citations (Scopus)


The sorption of metal ions from sodium arsenate solution by using an agricultural by-product, tree fern, has been investigated. The sorption of sodium cation on tree fern has been studied in terms of pseudo-second-order sorption processes. The pseudo second-order kinetic model has been developed to predict the rate constant of sorption, the equilibrium capacity and initial sorption rate with the effect of initial metal ion concentration. The Henry's law, Langmuir and Redlich-Peterson isotherms were used to correlate experimental isotherms. The sorption of sodium cation follows Henry's law and a modified Redlich-Peterson isotherm. However, the arsenic could not be removed from sodium arsenate solution by the sorption for the reason that arsenic is in the form of anion as arsenic acids in the solution and because of the negative charge of tree fern surface.

Original languageEnglish
Pages (from-to)352-356
Number of pages5
JournalProcess Safety and Environmental Protection
Issue number5
Publication statusPublished - Sep 2003



  • Adsorption
  • Agricultural by-product
  • Isotherm
  • Kinetic model
  • Sodium
  • Tree fern

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Safety, Risk, Reliability and Quality
  • Environmental Engineering
  • Safety Research
  • Environmental Chemistry

Cite this