Review of second-order models for adsorption systems

Yuh Shan Ho

Research output: Contribution to journalArticlepeer-review

3212 Citations (Scopus)


Applications of second-order kinetic models to adsorption systems were reviewed. An overview of second-order kinetic expressions is described in this paper based on the solid adsorption capacity. An early empirical second-order equation was applied in the adsorption of gases onto a solid. A similar second-order equation was applied to describe ion exchange reactions. In recent years, a pseudo-second-order rate expression has been widely applied to the adsorption of pollutants from aqueous solutions onto adsorbents. In addition, the earliest rate equation based on the solid adsorption capacity is also presented in detail.

Original languageEnglish
Pages (from-to)681-689
Number of pages9
JournalJournal of Hazardous Materials
Issue number3
Publication statusPublished - Aug 25 2006


  • Biosorption
  • Kinetics
  • Pseudo-second-order
  • Second-order
  • Sorption

ASJC Scopus subject areas

  • Chemical Health and Safety
  • Process Chemistry and Technology
  • Safety, Risk, Reliability and Quality
  • Environmental Engineering


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