Competitive Adsorption of Basic Dyes onto Calcite in Single and Binary Component Systems


Atun G., Acar E. T.

SEPARATION SCIENCE AND TECHNOLOGY, vol.45, no.10, pp.1471-1481, 2010 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 45 Issue: 10
  • Publication Date: 2010
  • Doi Number: 10.1080/01496395.2010.485603
  • Journal Name: SEPARATION SCIENCE AND TECHNOLOGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1471-1481
  • Istanbul University Affiliated: Yes

Abstract

Equilibrium and kinetic behavior of two basic dyes, Methylene Blue (MB) and Safranine T (ST), onto calcite in single and binary component systems have been studied. Experimental equilibrium results have been well predicted by the Freundlich and the Langmuir isotherm models. The model parameters obtained for single solute systems at 298K have been used for the calculation of adsorption isotherms in binary dye solutions using multi-component isotherm models. Extended Freundlich and extended Langmuir models satisfactorily fit to MB-ST adsorption in binary solutions. A site distribution function which gives information about the affinity of adsorption sites for competing species in a binary system has been mathematically calculated by using Freundlich isotherm parameters. Time-dependent results for single and binary dye solutions have been analyzed according to the Vermeulen and McKay models based on homogeneous and heterogeneous diffusion processes, respectively. Thermodynamic functions for the transition state have been evaluated from the temperature dependence of diffusion coefficients using the Eyring equation.