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The capacity of activated kaolins to remove colour pigments from rice bran oil: the effects of acid concentration and pre-heating prior to activation

Published online by Cambridge University Press:  27 February 2018

L. L. Aung ,
E. Tertre ,
N. Worasith ,
P. Suksabye  and
P. Thiravetyan
L. L. Aung
Affiliation:
Division of Biotechnology, School of Bioresources and Technology, King Mongkut’s University of Technology Thonburi, Bangkhuntien, Bangkok 10150, Thailand Université de Poitiers-CNRS, UMR 7285 IC2MP, Equipe HydrASA, rue Albert Turpain, Bat. B8, 86022 Poitiers Cedex, France
E. Tertre
Affiliation:
Université de Poitiers-CNRS, UMR 7285 IC2MP, Equipe HydrASA, rue Albert Turpain, Bat. B8, 86022 Poitiers Cedex, France
N. Worasith
Affiliation:
Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Krungthep, 2 Nang Lin Chi Road, Soi Suan Plu, Sathorn, Bangkok, Thailand
P. Suksabye
Affiliation:
Department of Urban and Industrial Environment, Science and Technology Faculty, Suan Dusit Rajabhat University, Bangkok 10300, Thailand
P. Thiravetyan*
Affiliation:
Division of Biotechnology, School of Bioresources and Technology, King Mongkut’s University of Technology Thonburi, Bangkhuntien, Bangkok 10150, Thailand
*
*E-mail: paitip.thi@kmutt.ac.th
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Abstract

This study focuses on the effects of both thermal treatment (between 80 and 700°C) and chemical activation (concentration of sulfuric acid between 0.3 and 2 M) of natural Ranong kaolins (ground or not) from Thailand to remove the undesirable colour of rice bran oil. The mineralogical, physical and physicochemical properties of the initial and activated kaolins are discussed in relation with the bleaching effectiveness of the activated sample investigated. Generally, the greater the temperature used before the activation step and the concentration of sulfuric acid used during activation, the greater the structural degradation of the kaolinite; Al is removed from the octahedral sheet of kaolinite and amorphous SiO2 dominates the samples. The measured maximum bleaching capacity is not necessarily obtained when using the activated kaolin having the highest specific surface area and pore volume; rather, the bleaching capacity is dependent on both alumina contents and proportion of kaolinite in the samples. Indeed, the partial preservation of the kaolinite structure is crucial to obtain a good bleaching capacity of kaolin in relation to the preservation of the aluminol sites which are likely to be involved in the adsorption of unsaturated molecules present in the rice bran oil. Moreover, as previously demonstrated, a partial leaching of Al from octahedral sheets of kaolin is also an important factor in order to obtain good bleaching capacities. Finally, the optimal preheating temperature and concentration of sulfuric acid which permit the best bleaching capacity of kaolin are reported.

Keywords

natural clay materialkaolinitecolour organic pigmentsbleachingrice bran oil
Type
Research Article
Information
Clay Minerals , Volume 49 , Issue 4 , September 2014 , pp. 513 - 526
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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