Enhanced adsorption of Acid Red 88 by an excellent adsorbent prepared from alunite
Article first published online: 17 MAY 2012
© 2012 Society of Chemical Industry
Journal of Chemical Technology and Biotechnology
Volume 88, Issue 2, pages 293–304, February 2013
How to Cite
Tunali Akar, S., Alp, T. and Yilmazer, D. (2013), Enhanced adsorption of Acid Red 88 by an excellent adsorbent prepared from alunite. J. Chem. Technol. Biotechnol., 88: 293–304. doi: 10.1002/jctb.3831
- Issue published online: 22 JAN 2013
- Article first published online: 17 MAY 2012
- Manuscript Revised: 27 MAR 2012
- Manuscript Accepted: 27 MAR 2012
- Manuscript Received: 15 FEB 2012
BACKGROUND: Calcination significantly increased the adsorption performance of alunite for Acid Red 88.
RESULTS: The adsorption properties of calcined alunite for Acid Red 88 were investigated. pH, adsorbent dosage, contact time and ionic strength were found to influence the adsorption. Temperature did not significantly affect the process. Kinetic data obey a pseudo-second-order model, while intraparticle diffusion is not the only rate-limiting step. The Langmuir isotherm well described the equilibrium data. The monolayer adsorption capacity of calcined alunite was found to be 832.81 mg g−1. It was successfully used for the removal of dye in continuous mode at a flow rate of 4.0 mL min−1. Co-anions affected the adsorption capacity of calcined alunite but the presence of other organic compounds in the same medium did not significantly change the adsorption performance. Reusability studies showed that the calcined alunite can be reused four times. Electrostatic interaction, ion-exchange and complexation were found to be effective mechanisms for the adsorption of Acid Red 88 by calcined alunite.
CONCLUSION: This study demonstrated that calcined alunite has excellent adsorption performance and might be a very good adsorbent for Acid Red 88 as an abundant, economical and practical material. © 2012 Society of Chemical Industry