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Adsorptive Removal of Acid Blue 113 and Tartrazine by Fly Ash from Single and Binary Dye Solutions

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Adsorption of two acid dyestuffs, acid blue 113 (AB) and tartrazine (TA), has been studied from their single and binary solutions by using fly ash (FA) as an adsorbent. The S shaped isotherms observed for dye adsorption from single solutions show that both acid dyes are not preferred at a low concentration region whereas adsorption of the dyes from binary solutions is enhanced via solute-solute interactions. Although the L-shaped isotherm is observed in binary solutions adsorbability of AB decreases in concentrated solutions with respect to single one, time dependency of adsorption is well described with a pseudo-second-order kinetic model as well as the linear relation of Bt vs. t plots (not passing through origin) indicates that film diffusion is effective on dye adsorption. Modeled isotherm curves using isotherm parameters of the Freundlich and Dubinin-Radushkevich (D-R) equations adequately fit to experimental equilibrium data. Equilibrium adsorption of AB in binary solutions has been quite well predicted by the extended Freundlich and the Sheindorf-Rebuhn-Sheintuch (SRS) models. In general, the isotherm curves constructed in the temperature range of 298-328 K show that the optimum temperature is 318 K for AB removal from both single and binary solutions.

Keywords: Acid blue 113; acid dyes; adsorption; fly ash; tartrazine

Document Type: Research Article


Affiliations: Istanbul University, Department of Chemistry, Faculty of Engineering, Avcilar-Istanbul, Turkey

Publication date: 2009-01-01

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