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In relation to this article, we declare that there is no conflict of interest.
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Received January 10, 2014
Accepted June 24, 2014
articles 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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Coffee waste as potential adsorbent for the removal of basic dyes from aqueous solution

Laboratory of Wastewater Treatment, CERTE, BP 273, Soliman 8020, Tunisia 1School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia
amor.hafiane@certe.rnrt.tn
Korean Journal of Chemical Engineering, December 2014, 31(12), 2198-2206(9), 10.1007/s11814-014-0171-7
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Abstract

We evaluated the adsorption performance of coffee waste (CW), collected from coffee shops, for the removal of two basic dyes, toluidine blue (TB) and crystal violet (CV), from aqueous solutions. Batch adsorption experiments were conducted under different conditions including contact time, initial concentration of dye, pH, sorbent dosage and temperature. The Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R) isotherms were tested to examine_x000D_ the adsorption behavior. The equilibrium data were well fitted by Langmuir isotherm model. The kinetic study indicates that adsorption follows the pseudo second-order model. The maximum adsorption capacity was found to be as high as 142.5 mg/g for TB and 125 mg/g for CV, which makes CW a prospective adsorbent for the removal of basic dyes from aqueous solution.

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