Al-pillared acid-activated montmorillonite modified electrodes
Φόρτωση...
Ημερομηνία
Συγγραφείς
Falaras, P.
Lezou, F.
Pomonis, P.
Ladavos, A.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Elsevier
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Journal of Electroanalytical Chemistry
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
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.
Περιγραφή
Λέξεις-κλειδιά
clay modified electrode, montmorillonite, acid activation, pillaring, clay-modified electrodes, catalytic activity, adsorption, aluminum, oils
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000165579500008
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας