The adsorption of basic dye (Astrazon Blue FGRL) from aqueous solutions onto two different clays: Talc and Chrysotile

Erhan Gengec



In this study, Talc and Chrysotile were obtained from Sivas, Turkey and used as adsorbents for the investigation of the adsorption of the basic dye (Astrazon Blue FGRL) from aqueous solutions at various dye concentrations (100–400 mg/L), initial pH (3-7), adsorbent doses (1-4 g/L), contact time (2.5-1400 min) and temperatures (313–333 K). The result showed that the adsorption capacity of the dye increased with increasing initial dye concentration, pH, adsorbent dose and temperature. In addition, three kinetic models; the pseudo first order, pseudo second order and intraparticle diffusion, were used to predict the adsorption rate constants. The results showed that the highest correlation coefficients (R2>0.9960) were obtained for pseudo second order kinetics. When the natural clays were compared, it was observed that, Talc showed higher removal efficiencies and adsorption capacity than Chrysotile. The highest adsorption capacity was obtained as 284 mg/g and 169 mg/g for Talc and Chrysotile at pH 7, 298 ºK, 300 mg/L of initial dye concentration and 1020 min of agitation time, respectively. The results showed that Talc and Chrysotile have important potentials for removal of basic dyes which are cheap and easy available.



Basic dyes; Natural clays; Adsorption kinetics; Pseudo second order kinetics.

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