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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received February 10, 2008
Accepted June 13, 2008

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Studies on auramine dye adsorption on psidium guava leaves

Ravindra Wamanrao Gaikwad^† Sunil Ashok Misal Kinldy

Department of Chemical Engineering, Pravara Rural Engineering College, Loni, 413736, India

Korean Journal of Chemical Engineering, January 2009, 26(1), 102-107(6), 10.1007/s11814-009-0016-y

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Abstract

Removal of auramine dye from aqueous waste solutions was investigated by using very cheap and biosorbent, withered guava tree leaves and activated carbon. Guava leaves are readily available in the western and northern parts of India throughout the year, and hence form a cost effective alternative for removal of dyes from waste waters. The optimum contact time was found to be 120 min. in a pH range of 8-9 for 92-94% removal of the dye from aqueous solutions containing 150 mg/L of auramine dye using 2 g of the adsorbent. The effect of pH, dye concentration, sorbent dosage, temperature and contact time on the dye removal efficiency has been studied. Experimental results were found to fit both Freundlich and Langmuir models. Since the dye contains a cationic species, the removal efficiency was highest in a pH range of 8-9. Continuous adsorption studies in a packed column showed 100% removal efficiency for a flow_x000D_ rate of 10 ml·min^(-1). When compared with the activated carbon, it was also found that adsorbent derived from guava leaves is more efficient in removal of dye.

Keywords

Auramine Dye Removal Guava Leaves Adsorption Isotherms Adsorption Kinetics Breakthrough Curve

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