Competitive adsorption of benzoic acid and p -nitrophenol onto activated carbon: Isotherm and breakthrough curves

Jia Ming Chern, Yi Wen Chien

Research output: Contribution to journalArticlepeer-review

83 Citations (Scopus)


Three series of batch tests at 25°C were performed to determine the benzoic acid and p-nitrophenol (PNP) binary adsorption isotherms onto GAC in the aqueous solutions and the experimental data were fitted to the extended Langmuir isotherm model successfully. The experimental data and the isotherm model parameters showed that the GAC used in this study had a higher affinity to PNP than benzoic acid. Three column tests were performed to determine the breakthrough curves and effluent solution pH with varying feed compositions. According to the experimental results, the weakly adsorbed BA exhibited an intermediate zone of effluent concentration higher than its feed one; the effluent solution pH could serve as a good indicator for breakthrough. The breakthrough curves with varying feed compositions could be predicted by the non-linear wave propagation theory satisfactorily. Only the adsorption isotherm models were required to construct the composition path diagram with which the breakthrough curves could be predicted.

Original languageEnglish
Pages (from-to)2347-2356
Number of pages10
JournalWater Research
Issue number10
Publication statusPublished - Jan 1 2003
Externally publishedYes


  • Activated carbon
  • Adsorption
  • Benzoic acid
  • Breakthrough curve
  • Isotherm
  • p-nitrophenol

ASJC Scopus subject areas

  • Ecological Modelling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution


Dive into the research topics of 'Competitive adsorption of benzoic acid and p -nitrophenol onto activated carbon: Isotherm and breakthrough curves'. Together they form a unique fingerprint.

Cite this