Bleaching properties of alumina-pillared acid-activated montmorillonite

This item is provided by the institution :
University of Ioannina
Repository :
Repository of UOI Olympias
see the original item page
in the repository's web site and access all digital files if the item*

2000 (EN)
Bleaching properties of alumina-pillared acid-activated montmorillonite (EN)

Falaras, P. (EN)

Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας (EL)
Falaras, P. (EN)

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)

acid activation (EN)

Πανεπιστήμιο Ιωαννίνων (EL)
University of Ioannina (EN)

Clays and Clay Minerals (EN)



<Go to ISI>://000165140600007

The Clay Minerals Society (EN)

*Institutions are responsible for keeping their URLs functional (digital file, item page in repository site)