Bleaching properties of alumina-pillared acid-activated montmorillonite

Falaras, P; Lezou, F; Seiragakis, G; Petrakis, D

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