Application of diffusion model for adsorption of azo reactive dye on pumice

Veliev E., Ozturk T., Veli S., Fatullayev A. G.

POLISH JOURNAL OF ENVIRONMENTAL STUDIES, vol.15, no.2, pp.347-353, 2006 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 15 Issue: 2
  • Publication Date: 2006
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.347-353
  • Kocaeli University Affiliated: Yes


In this work, adsorption of reactive azo dye on pumice has been studied by using batch techniques. The influence of agitation, initial dye concentration, and adsorbent mass has been studied. The equilibrium adsorption capacity of pumice for dye was obtained by using linear Freundlich isotherm. It was found that pumice could be an appropriate adsorbent in removal of dye from wastewater. In order to explain the adsorption mechanism, a diffusion model was applied, and calculations were made for solid diffusivity, (D-s) and external mass-transfer coefficient (k(f)). The applied diffusion model showed that k(f) was constant for all initial dye concentrations (c(o)), and D-s increased as c(o) did. Furthermore, D-s was found to decrease with increasing adsorbent mass.