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Bleaching Properties of Alumina-Pillared Acid-Activated Montmorillonite

Published online by Cambridge University Press:  28 February 2024

Polycarpos Falaras ,
Fani Lezou ,
Georgios Seiragakis  and
Dimitrios Petrakis
Polycarpos Falaras*
Affiliation:
Institute of Physical Chemistry, NCSR “Demokritos”, 153 10 Aghia Paraskevi Attikis, Greece
Fani Lezou
Affiliation:
Institute of Physical Chemistry, NCSR “Demokritos”, 153 10 Aghia Paraskevi Attikis, Greece National Technical University of Athens, Chemical Engineering Department, Iroon Politechniou 9, 157 80, Zografou, Athens, Greece
Georgios Seiragakis
Affiliation:
MINERVA S.A. Edible Oils Enterprises, 31 Valaoritou St., 14452 Metamorphosis, Attica, Greece
Dimitrios Petrakis
Affiliation:
Department of Chemistry, University of Ioannina, 45332, Ioannina, Greece
*
E-mail of corresponding author: papi@mail.demokritos.gr
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Abstract

The bleaching of cottonseed oil by alumina-pillared (Al-pillared) acid-activated clays was investigated. Acid activation of a Ca-rich montmorillonite (CMS STx-1) following treatment with 1, 4, and 8 eq/L sulfuric-acid solutions, as well as subsequent pillaring with alumina, produces new materials. These materials have bleaching properties dependent upon the extent of activation of the clay prior to pillaring. The pillared acid-activated montmorillonites possessed higher bleaching efficiency compared to pillared products of the untreated clay. Mild activation of the montmorillonite matrix, pillaring with the Keggin ion [Al13O4(OH)24(H2O)12]7+, and calcination temperatures to 500°C produced materials with the best fractional degree of bleaching. Direct comparison to the performance of a commercial bleaching earth (Tonsil Optimum 214, Sud-Chemie AG. Moosburg, Germany) shows that the efficiency of the Al-pillared acid-activated montmorillonite may be improved. The optimization of the bleaching process is achieved via a judicious utilization of intermediate surface area, relatively high acidity, and enhanced pore volume.

Keywords

Acid ActivationAlumina-Pillared MontmorilloniteBleachingClayCottonseed Oil
Type
Research Article
Information
Clays and Clay Minerals , Volume 48 , Issue 5 , October 2000 , pp. 549 - 556
Copyright
Copyright © 2000, The Clay Minerals Society

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