alexa Use of Aluminium Hydroxide Sludge as Adsorbents for the Removal of Reactive Dyes: Equilibrium, Thermodynamic, and Kinetic Studies | OMICS International | Abstract
ISSN: 2157-7587

Hydrology: Current Research
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Research Article

Use of Aluminium Hydroxide Sludge as Adsorbents for the Removal of Reactive Dyes: Equilibrium, Thermodynamic, and Kinetic Studies

Burcu Uçar, Afife Güvenç and Ülkü Mehmetoglu*
Ankara University, Faculty of Engineering, Chemical Engineering Department, Tandogan, 06100 Ankara, Turkey
Corresponding Author : Dr. Ülkü Mehmetoglu
Ankara University, Faculty of Engineering Chemical Engineering Department, Tandogan 06100 Ankara, Turkey
Tel:
90-312-203 34 35
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E-mail: [email protected] ankara.edu.tr
Received March 03, 2011; Accepted May 10, 2011; Published May 28, 2011
Citation: Uçar B, Güvenç A, Mehmetoglu Ü (2011) Use of Aluminium Hydroxide Sludge as Adsorbents for the Removal of Reactive Dyes: Equilibrium, Thermodynamic, and Kinetic Studies. Hydrol Current Res 2:112. doi: 10.4172/2157-7587.1000112
Copyright: © 2011 Uçar B, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

This study investigated the removal of RR-2 and RB-4 dyes from aqueous solutions by adsorption using poppy bagasse, sugar beet bagasse, aluminium hydroxide sludge, phosphogypsum, ferrochromium plant waste, and orange peel. Aluminium hydroxide sludge had the highest adsorption capacity for both dyes. The equilibrium time was 2 days. The effects on adsorption of pH, adsorbent concentration, and stirring rate were investigated. The highest removal percentage was 80.75% and 99.74% for RR-2 and RB-4, respectively. Adsorption of RR-2 was expressed better with a Freundlich adsorption equation, while adsorption of RB-4 was expressed better with a Langmuir adsorption equation. Adsorption of RR-2 agreed with the pseudo-first-order rate equation and adsorption of RB-4 followed the pseudo-second-order rate equation. Moreover, both removal processes are endothermic. Various thermodynamic parameters, such as ?G°, ?HG°, and ?SG°, were calculated.

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