Determination of adsorptive properties of clay/water system: methylene blue sorption

Gurses A., Karaca S., DOGAR C., Bayrak R., ACIKYILDIZ M., YALCIN M.

JOURNAL OF COLLOID AND INTERFACE SCIENCE, vol.269, no.2, pp.310-314, 2004 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 269 Issue: 2
  • Publication Date: 2004
  • Doi Number: 10.1016/j.jcis.2003.09.004
  • Journal Name: JOURNAL OF COLLOID AND INTERFACE SCIENCE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.310-314
  • Keywords: adsorption isotherms, clay, adsorption, methylene blue, AQUEOUS-SOLUTIONS, SURFACE-AREA, BASIC-DYES, REMOVAL, MECHANISM, EFFLUENTS, THIONINE, KINETICS, CARBONS, CLAYS
  • Ataturk University Affiliated: Yes

Abstract

In this study, adsorption of methylene blue onto clay was investigated. The effect of adsorption time and temperature on the adsorption process was studied. To reveal the adsorptive characteristics of the clay studied, porosity and BET surface area measurements were made. It was observed that the adsorption capacity decreases with increasing temperature, and adsorption equilibrium was attained within 1 h. It was found that the data fit well to Langmuir, Halsey, Henderson, and Harkins-Jura models but experimental data deviate significantly from BET and Freundlich models at especially high concentrations. Furthermore, isosteric adsorption enthalpy and entropy are calculated as -7.99 kJ mol(-1) and 25.41 J K-1 mol(-1), respectively. (C) 2003 Elsevier Inc. All rights reserved.