Adsorption-desorption rate of nonpolar volatile organic compounds onto activated carbon exemplified by C6H6 and CCl4

C. L. Chuang, P. C. Chiang, E. E. Chang, C. P. Huang

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

This investigation was to evaluate the performance of a thermodynamic model using nonlinear driving force in conjunction with the Langmuir model exemplified by the adsorption of benzene and carbon tetrachloride onto activated carbon in mono- and binary-adsorbate systems. Results show that model-fitted adsorption and desorption rate constants could well predict the adsorption isotherms and breakthrough curves under various conditions. This numerical model can provide adsorption and desorption rate constants. The kinetic parameters are of the same order of magnitude as reported in several studies. Under high reaction temperatures, both the adsorption and desorption rate constants increased while equilibrium constants decreased. A dimensionless valuable C0/K can be used to describe the relationship between adsorbate and adsorbent, and predict the service cycle during the adsorption process. For adsorption in binary mixtures, a high inlet concentration or a low temperature, the weak adsorbate, C6H6, will have a high breakthrough concentration when the strong adsorbate, CCl4, began to break through.

Original languageEnglish
Pages (from-to)148-155
Number of pages8
JournalPractice Periodical of Hazardous, Toxic, and Radioactive Waste Management
Volume7
Issue number3
DOIs
Publication statusPublished - Jul 2003

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Keywords

  • Activated carbon
  • Adsorption
  • Desorption
  • Kinetics

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Chemical Engineering(all)
  • Environmental Engineering
  • Water Science and Technology
  • Waste Management and Disposal
  • Environmental Science(all)

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