Adsorption studies of Toluidine Blue from aqueous solutions onto gypsum

M. A. Rauf, Shahnaz M. Qadri, Sarmadia Ashraf, Karima M. Al-Mansoori

Research output: Contribution to journalArticlepeer-review

98 Citations (Scopus)


Gypsum was investigated as an inexpensive and efficient adsorbent to remove Toluidine Blue from aqueous solution. The adsorption studies were carried out at room temperature. Batch mode experiments were conducted at 25 °C to study the effects of pH and initial concentration of Toluidine Blue. The adsorption data was analyzed by using the Langmuir, Freundlich and Tempkin isotherm models and was found to give better results with respect to Langmuir equation. The maximum monolayer adsorption capacity was found to be 28 mg of the dye per gram of gypsum. The data were also studied in terms of their kinetic behavior and was found to obey the pseudo second order equation.

Original languageEnglish
Pages (from-to)90-95
Number of pages6
JournalChemical Engineering Journal
Issue number1
Publication statusPublished - Jul 15 2009


  • Adsorption
  • Dye
  • Gypsum
  • Kinetics
  • Toluidine Blue

ASJC Scopus subject areas

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


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