Al-pillared acid-activated montmorillonite modified electrodes

Falaras, P; Lezou, F; Pomonis, P; Ladavos, A

dc.contributor.author	Falaras, P	en
dc.contributor.author	Lezou, F	en
dc.contributor.author	Pomonis, P	en
dc.contributor.author	Ladavos, A	en
dc.date.accessioned	2014-03-01T01:49:45Z
dc.date.available	2014-03-01T01:49:45Z
dc.date.issued	2000	en
dc.identifier.issn	0022-0728	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/25905
dc.subject	clay modified electrode	en
dc.subject	montmorillonite	en
dc.subject	acid activation	en
dc.subject	pillaring	en
dc.subject.classification	Chemistry, Analytical	en
dc.subject.classification	Electrochemistry	en
dc.subject.other	CLAY-MODIFIED ELECTRODES	en
dc.subject.other	CATALYTIC ACTIVITY	en
dc.subject.other	ADSORPTION	en
dc.subject.other	ALUMINUM	en
dc.subject.other	OILS	en
dc.title	Al-pillared acid-activated montmorillonite modified electrodes	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	The role of acid activation of the montmorillonite matrix before pillaring and the effect of calcination temperature on the efficiency of Al-pillared acid-activated clay modified electrodes have been investigated. The electrochemical behaviour of untreated and pillared montmorillonites was compared with that of two pillared acid-activated montmorillonites. The pillared acid-activated montmorillonite modified electrodes present better electroactivity than the modified electrodes of the conventional pillared montmorillonite towards cationic and anionic redox active species. Mild acid activation of the montmorillonite matrix and a calcination temperature up to 500 degreesC lead to modifying materials that efficiently concentrate the cationic species. Lower calcination temperatures reverse the electrode activity. For anionic redox active species the best electroactivity was observed for pillared acid-activated montmorillonite films corresponding to a medium acid activation. In that case, a dependence of the electrochemical response on the pH was confirmed. The mechanism responsible for the observed cationic electroactivity was investigated and the behaviour of the Al-pillared acid-activated montmorillonite modified electrodes was attributed to the particular structure as well as the enhanced meso-external surface area and acidity of the clay films. (C) 2000 Elsevier Science S.A. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE SA	en
heal.journalName	JOURNAL OF ELECTROANALYTICAL CHEMISTRY	en
dc.identifier.isi	ISI:000165579500008	en
dc.identifier.volume	486	en
dc.identifier.issue	2	en
dc.identifier.spage	156	en
dc.identifier.epage	165	en