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

Publication history: Received December 17, 2009
Accepted March 29, 2010

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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Removal of Orange G from aqueous solution by hematite: Isotherm and mass transfer studies

Monoj Kumar Mondal^† Sudama Singh¹ Meka Umareddy Betty Dasgupta

Department of Chemical Engineering & Technology, Institute of Technology, Banaras Hindu University, Varanasi 221005, India ¹Department of Ceramic Engineering, Institute of Technology, Banaras Hindu University, Varanasi 221005, India

Korean Journal of Chemical Engineering, November 2010, 27(6), 1811-1815(5), 10.1007/s11814-010-0301-9

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Abstract

The efficiency of hematite for the removal of Orange G from aqueous solution has been studied at various concentrations as a function of time, temperatures and pH. It was found that the low initial concentration, low temperature and low pH favor the removal process. The maximum adsorption of the dye on hematite has been recorded at 25 mg/l concentration, 303 K temperature and pH 3. The negative values of change in free energy and enthalpy indicate the spontaneous and exothermic nature of the process, respectively. Fixation and immobilization of the dye molecules_x000D_ at the surface of hematite as a result of adsorption are responsible for the negative entropy effect. The effect of pH was described by considering coulombic attraction and aqua complex formation approaches. The applicability of various adsorption isotherms--Langmuir, Freundlich and Jossens--was tested in order to find the most suitable isotherm. The Freundlich isotherm was fitted with the data of the present study.

Keywords

Orange G Hematite Adsorption Isotherm Thermodynamic Parameters Mass Transfer Aqueous Solution

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