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Comments on the characterization of untreated and ground kaolin from Ranong, Thailand

Published online by Cambridge University Press:  02 January 2018

Bernard A. Goodman  and
Niramon Worasith
Bernard A. Goodman*
Affiliation:
College of Physical Science & Engineering, and State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530004 Guangxi, China
Niramon 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
*
*E-mail: bernard_a_goodman@yahoo.com
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Abstract

Aung et al. (2014, 2015) described the activation of kaolin samples to remove coloured pigments from rice-bran oil, the effects of various treatments on their decolourization capacity, and the characterization of these kaolin samples by physical methods. This research used a kaolin sample from Ranong in southern Thailand, and investigated the effects of grinding and heat treatment prior to acid activation of the mineral. The various activated mineral phases were then characterized by a combination of X-ray diffraction, Fourier-Transform infrared spectroscopy and X-ray fluorescence. This work represented an extension of research reported previously by Worasith et al. (2011a), in which various samples of the same Ranong kaolin were characterized after grinding and acid activation, and their capacities to decolourize rice-bran oil evaluated (Worasith et al., 2011b). However, despite the similarities in the experiments, there are some important differences in the results presented in these two sets of publications, which raise questions concerning the conduct of this type of research and the generality of any conclusions derived.

Keywords

activationkaolin samplesdecolourizationThailand
Type
Short Note
Information
Clay Minerals , Volume 51 , Issue 5 , December 2016 , pp. 741 - 745
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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