Analysis of cadmium adsorption on novel organo-ceramic adsorbents with a thiol functionality

S. Gomez-Salazar, J. S. Lee, J. C. Heydweiller, L. L. Tavlarides

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37 Scopus citations


The adsorption characteristics of cadmium ions from aqueous solutions onto two organo-ceramic adsorbents synthesized in our laboratories were studied. The main species participating in the adsorption process, determined from the chemical equilibrium, is Cd2+. Formation of a bidentate cadmium-thiol complex is proposed to explain the experimental isotherms. The kinetics of adsorption onto the sol-gel-synthesized adsorbent was studied in a differential batch reactor with recycle. Two kinetic models were tested with experimental data: chemical reaction and film/pore mass-transfer resistances. The results indicate that either model can be used to explain the adsorption process as observed from the AARD values and from the F-test. The values of fitted parameters are k1 = 0.0021 L·g/mmol2·min, Dp = 1.4 × 10-7 cm2/s, and τ = 5.0. The last two parameters can be used to satisfactorily predict the breakthrough curve in a fixed bed by the film/pore diffusion model. A sensitivity analysis shows that pore diffusion resistances control the adsorption process.

Original languageEnglish (US)
Pages (from-to)3403-3412
Number of pages10
JournalIndustrial and Engineering Chemistry Research
Issue number14
StatePublished - Jul 9 2003

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering


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