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Bleaching properties of alumina-pillared acid-activated montmorillonite

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dc.contributor.author Falaras, P en
dc.contributor.author Lezou, F en
dc.contributor.author Seiragakis, G en
dc.contributor.author Petrakis, D en
dc.date.accessioned 2014-03-01T01:49:46Z
dc.date.available 2014-03-01T01:49:46Z
dc.date.issued 2000 en
dc.identifier.issn 0009-8604 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/25915
dc.subject acid activation en
dc.subject alumina-pillared montmorillonite en
dc.subject bleaching en
dc.subject clay en
dc.subject cottonseed oil en
dc.subject.classification Geosciences, Multidisciplinary en
dc.subject.classification Mineralogy en
dc.subject.classification Soil Science en
dc.subject.classification Water Resources en
dc.subject.other CLAY CATALYSTS en
dc.subject.other CHLOROPHYLL ADSORPTION en
dc.subject.other MODIFIED ELECTRODES en
dc.subject.other SURFACE-ACIDITY en
dc.subject.other VEGETABLE-OILS en
dc.subject.other DESORPTION en
dc.subject.other MINERALS en
dc.subject.other PYRIDINE en
dc.subject.other PALM en
dc.title Bleaching properties of alumina-pillared acid-activated montmorillonite en
heal.type journalArticle en
heal.language English en
heal.publicationDate 2000 en
heal.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 degreesC 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. en
heal.publisher CLAY MINERALS SOCIETY en
heal.journalName CLAYS AND CLAY MINERALS en
dc.identifier.isi ISI:000165140600007 en
dc.identifier.volume 48 en
dc.identifier.issue 5 en
dc.identifier.spage 549 en
dc.identifier.epage 556 en


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